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Message-ID: <d208426b-d73e-af1f-3a46-66a6ed7eb4ec@linaro.org>
Date: Tue, 10 Jan 2023 19:43:55 +0100
From: Konrad Dybcio <konrad.dybcio@...aro.org>
To: Robert Marko <robimarko@...il.com>, linux-arm-msm@...r.kernel.org,
andersson@...nel.org, agross@...nel.org,
krzysztof.kozlowski@...aro.org
Cc: marijn.suijten@...ainline.org,
angelogioacchino.delregno@...labora.com,
AngeloGioacchino Del Regno
<angelogioacchino.delregno@...ainline.org>,
Liam Girdwood <lgirdwood@...il.com>,
Mark Brown <broonie@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8 4/5] soc: qcom: Add support for Core Power Reduction
v3, v4 and Hardened
On 10.01.2023 19:42, Robert Marko wrote:
>
> On 10. 01. 2023. 19:29, Konrad Dybcio wrote:
>>
>> On 10.01.2023 19:27, Robert Marko wrote:
>>> On 10. 01. 2023. 18:56, Konrad Dybcio wrote:
>>>> From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...ainline.org>
>>>>
>>>> This commit introduces a new driver, based on the one for cpr v1,
>>>> to enable support for the newer Qualcomm Core Power Reduction
>>>> hardware, known downstream as CPR3, CPR4 and CPRh, and support
>>>> for MSM8998 and SDM630 CPU power reduction.
>>>>
>>>> In these new versions of the hardware, support for various new
>>>> features was introduced, including voltage reduction for the GPU,
>>>> security hardening and a new way of controlling CPU DVFS,
>>>> consisting in internal communication between microcontrollers,
>>>> specifically the CPR-Hardened and the Operating State Manager.
>>>>
>>>> The CPR v3, v4 and CPRh are present in a broad range of SoCs,
>>>> from the mid-range to the high end ones including, but not limited
>>>> to, MSM8953/8996/8998, SDM630/636/660/845.
>>>>
>>>> Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...ainline.org>
>>>> [Konrad: rebase, apply review comments]
>>>> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
>>> Hi Konrad, great to see the series is alive again.
>>> I am working on IPQ8074 which uses CPRv4 and its the last piece for
>>> upstream CPU scaling that is missing so this is really interesting for me.
>>>
>>> However, I think you forgot to include the <soc/qcom/cpr.h> header so
>>> it wont currently compile.
>>>
>>> Regards,
>>> Robert
>> Right, that's rather embarassing..
>>
>> Here's the contents of the file, I will hold on with resending
>> until there are some more reviwew comments..
>
> Thanks, that gets it mostly compiling, however it seems that common
> CPR code is not getting selected to the symbols will be missing.
> Adding select QCOM_CPR_COMMON to QCOM_CPR3 sorts that out, so I
> assume it was just forgotten as QCOM_CPR has it selected.
Totally, thanks for pointing that out!
Konrad
>
> Regards,
> Robert
>
>>
>>
>> /* SPDX-License-Identifier: GPL-2.0-only */
>> /*
>> * Copyright (c) 2013-2020, The Linux Foundation. All rights reserved.
>> * Copyright (c) 2019 Linaro Limited
>> * Copyright (c) 2021, AngeloGioacchino Del Regno
>> * <angelogioacchino.delregno@...ainline.org>
>> */
>>
>> #ifndef __CPR_H__
>> #define __CPR_H__
>>
>> struct cpr_ext_data {
>> int mem_acc_threshold_uV;
>> int apm_threshold_uV;
>> };
>>
>> #endif /* __CPR_H__ */
>>
>>
>> Konrad
>>>> ---
>>>> drivers/soc/qcom/Kconfig | 21 +
>>>> drivers/soc/qcom/Makefile | 4 +-
>>>> drivers/soc/qcom/cpr-common.h | 2 +
>>>> drivers/soc/qcom/cpr3.c | 2923 +++++++++++++++++++++++++++++++++
>>>> 4 files changed, 2949 insertions(+), 1 deletion(-)
>>>> create mode 100644 drivers/soc/qcom/cpr3.c
>>>>
>>>> diff --git a/drivers/soc/qcom/Kconfig b/drivers/soc/qcom/Kconfig
>>>> index 21c4ce2315ba..303e958d9432 100644
>>>> --- a/drivers/soc/qcom/Kconfig
>>>> +++ b/drivers/soc/qcom/Kconfig
>>>> @@ -29,6 +29,7 @@ config QCOM_COMMAND_DB
>>>> config QCOM_CPR
>>>> tristate "QCOM Core Power Reduction (CPR) support"
>>>> depends on ARCH_QCOM && HAS_IOMEM
>>>> + select QCOM_CPR_COMMON
>>>> select PM_OPP
>>>> select REGMAP
>>>> help
>>>> @@ -42,6 +43,26 @@ config QCOM_CPR
>>>> To compile this driver as a module, choose M here: the module will
>>>> be called qcom-cpr
>>>> +config QCOM_CPR_COMMON
>>>> + tristate
>>>> +
>>>> +config QCOM_CPR3
>>>> + tristate "QCOM Core Power Reduction (CPR v3/v4/Hardened) support"
>>>> + depends on ARCH_QCOM && HAS_IOMEM
>>>> + select PM_OPP
>>>> + select REGMAP
>>>> + help
>>>> + Say Y here to enable support for the CPR hardware found on a broad
>>>> + variety of Qualcomm SoCs like MSM8996, MSM8998, SDM630, SDM660,
>>>> + SDM845 and others.
>>>> +
>>>> + This driver populates OPP tables and makes adjustments to them
>>>> + based on feedback from the CPR hardware. If you want to do CPU
>>>> + and/or GPU frequency scaling say Y here.
>>>> +
>>>> + To compile this driver as a module, choose M here: the module will
>>>> + be called qcom-cpr3
>>>> +
>>>> config QCOM_GENI_SE
>>>> tristate "QCOM GENI Serial Engine Driver"
>>>> depends on ARCH_QCOM || COMPILE_TEST
>>>> diff --git a/drivers/soc/qcom/Makefile b/drivers/soc/qcom/Makefile
>>>> index ba2b55dd94ff..362e9b712a68 100644
>>>> --- a/drivers/soc/qcom/Makefile
>>>> +++ b/drivers/soc/qcom/Makefile
>>>> @@ -3,7 +3,9 @@ CFLAGS_rpmh-rsc.o := -I$(src)
>>>> obj-$(CONFIG_QCOM_AOSS_QMP) += qcom_aoss.o
>>>> obj-$(CONFIG_QCOM_GENI_SE) += qcom-geni-se.o
>>>> obj-$(CONFIG_QCOM_COMMAND_DB) += cmd-db.o
>>>> -obj-$(CONFIG_QCOM_CPR) += cpr-common.o cpr.o
>>>> +obj-$(CONFIG_QCOM_CPR) += cpr.o
>>>> +obj-$(CONFIG_QCOM_CPR_COMMON) += cpr-common.o
>>>> +obj-$(CONFIG_QCOM_CPR3) += cpr3.o
>>>> obj-$(CONFIG_QCOM_DCC) += dcc.o
>>>> obj-$(CONFIG_QCOM_GSBI) += qcom_gsbi.o
>>>> obj-$(CONFIG_QCOM_MDT_LOADER) += mdt_loader.o
>>>> diff --git a/drivers/soc/qcom/cpr-common.h b/drivers/soc/qcom/cpr-common.h
>>>> index 2cd15f7eac90..a90f6351d022 100644
>>>> --- a/drivers/soc/qcom/cpr-common.h
>>>> +++ b/drivers/soc/qcom/cpr-common.h
>>>> @@ -65,6 +65,8 @@ struct corner {
>>>> struct corner_data {
>>>> unsigned int fuse_corner;
>>>> unsigned long freq;
>>>> + int oloop_vadj;
>>>> + int cloop_vadj;
>>>> };
>>>> struct acc_desc {
>>>> diff --git a/drivers/soc/qcom/cpr3.c b/drivers/soc/qcom/cpr3.c
>>>> new file mode 100644
>>>> index 000000000000..14a1163d37eb
>>>> --- /dev/null
>>>> +++ b/drivers/soc/qcom/cpr3.c
>>>> @@ -0,0 +1,2923 @@
>>>> +// SPDX-License-Identifier: GPL-2.0
>>>> +/*
>>>> + * Copyright (c) 2013-2020, The Linux Foundation. All rights reserved.
>>>> + * Copyright (c) 2019 Linaro Limited
>>>> + * Copyright (c) 2021, AngeloGioacchino Del Regno
>>>> + * <angelogioacchino.delregno@...ainline.org>
>>>> + */
>>>> +
>>>> +#include <linux/bitops.h>
>>>> +#include <linux/clk.h>
>>>> +#include <linux/debugfs.h>
>>>> +#include <linux/err.h>
>>>> +#include <linux/init.h>
>>>> +#include <linux/interrupt.h>
>>>> +#include <linux/io.h>
>>>> +#include <linux/kernel.h>
>>>> +#include <linux/mfd/syscon.h>
>>>> +#include <linux/module.h>
>>>> +#include <linux/nvmem-consumer.h>
>>>> +#include <linux/of_device.h>
>>>> +#include <linux/of.h>
>>>> +#include <linux/platform_device.h>
>>>> +#include <linux/pm_domain.h>
>>>> +#include <linux/pm_opp.h>
>>>> +#include <linux/regmap.h>
>>>> +#include <linux/regulator/consumer.h>
>>>> +#include <linux/slab.h>
>>>> +#include <linux/string.h>
>>>> +#include <linux/workqueue.h>
>>>> +#include <soc/qcom/cpr.h>
>>>> +
>>>> +#include "cpr-common.h"
>>>> +
>>>> +#define CPR3_RO_COUNT 16
>>>> +#define CPR3_RO_MASK GENMASK(CPR3_RO_COUNT - 1, 0)
>>>> +
>>>> +/* CPR3 registers */
>>>> +#define CPR3_REG_CPR_VERSION 0x0
>>>> +#define CPRH_CPR_VERSION_4P5 0x40050000
>>>> +
>>>> +#define CPR3_REG_CPR_CTL 0x4
>>>> +#define CPR3_CPR_CTL_LOOP_EN_MASK BIT(0)
>>>> +#define CPR3_CPR_CTL_IDLE_CLOCKS_MASK GENMASK(5, 1)
>>>> +#define CPR3_CPR_CTL_IDLE_CLOCKS_SHIFT 1
>>>> +#define CPR3_CPR_CTL_COUNT_MODE_MASK GENMASK(7, 6)
>>>> +#define CPR3_CPR_CTL_COUNT_MODE_SHIFT 6
>>>> +#define CPR3_CPR_CTL_COUNT_MODE_ALL_AT_ONCE_MIN 0
>>>> +#define CPR3_CPR_CTL_COUNT_MODE_ALL_AT_ONCE_MAX 1
>>>> +#define CPR3_CPR_CTL_COUNT_MODE_STAGGERED 2
>>>> +#define CPR3_CPR_CTL_COUNT_MODE_ALL_AT_ONCE_AGE 3
>>>> +#define CPR3_CPR_CTL_COUNT_REPEAT_MASK GENMASK(31, 9)
>>>> +#define CPR3_CPR_CTL_COUNT_REPEAT_SHIFT 9
>>>> +
>>>> +#define CPR3_REG_CPR_STATUS 0x8
>>>> +#define CPR3_CPR_STATUS_BUSY_MASK BIT(0)
>>>> +
>>>> +/*
>>>> + * This register is not present on controllers that support HW closed-loop
>>>> + * except CPR4 APSS controller.
>>>> + */
>>>> +#define CPR3_REG_CPR_TIMER_AUTO_CONT 0xC
>>>> +
>>>> +#define CPR3_REG_CPR_STEP_QUOT 0x14
>>>> +#define CPR3_CPR_STEP_QUOT_MIN_MASK GENMASK(5, 0)
>>>> +#define CPR3_CPR_STEP_QUOT_MIN_SHIFT 0
>>>> +#define CPR3_CPR_STEP_QUOT_MAX_MASK GENMASK(11, 6)
>>>> +#define CPR3_CPR_STEP_QUOT_MAX_SHIFT 6
>>>> +#define CPRH_DELTA_QUOT_STEP_FACTOR 4
>>>> +
>>>> +#define CPR3_REG_GCNT(ro) (0xA0 + 0x4 * (ro))
>>>> +#define CPR3_REG_SENSOR_OWNER(sensor) (0x200 + 0x4 * (sensor))
>>>> +
>>>> +#define CPR3_REG_CONT_CMD 0x800
>>>> +#define CPR3_CONT_CMD_ACK 0x1
>>>> +#define CPR3_CONT_CMD_NACK 0x0
>>>> +
>>>> +#define CPR3_REG_THRESH(thread) (0x808 + 0x440 * (thread))
>>>> +#define CPR3_THRESH_CONS_DOWN_MASK GENMASK(3, 0)
>>>> +#define CPR3_THRESH_CONS_DOWN_SHIFT 0
>>>> +#define CPR3_THRESH_CONS_UP_MASK GENMASK(7, 4)
>>>> +#define CPR3_THRESH_CONS_UP_SHIFT 4
>>>> +#define CPR3_THRESH_DOWN_THRESH_MASK GENMASK(12, 8)
>>>> +#define CPR3_THRESH_DOWN_THRESH_SHIFT 8
>>>> +#define CPR3_THRESH_UP_THRESH_MASK GENMASK(17, 13)
>>>> +#define CPR3_THRESH_UP_THRESH_SHIFT 13
>>>> +
>>>> +#define CPR3_REG_RO_MASK(thread) (0x80C + 0x440 * (thread))
>>>> +
>>>> +#define CPR3_REG_RESULT0(thread) (0x810 + 0x440 * (thread))
>>>> +#define CPR3_RESULT0_BUSY_MASK BIT(0)
>>>> +#define CPR3_RESULT0_STEP_DN_MASK BIT(1)
>>>> +#define CPR3_RESULT0_STEP_UP_MASK BIT(2)
>>>> +#define CPR3_RESULT0_ERROR_STEPS_MASK GENMASK(7, 3)
>>>> +#define CPR3_RESULT0_ERROR_STEPS_SHIFT 3
>>>> +#define CPR3_RESULT0_ERROR_MASK GENMASK(19, 8)
>>>> +#define CPR3_RESULT0_ERROR_SHIFT 8
>>>> +
>>>> +#define CPR3_REG_RESULT1(thread) (0x814 + 0x440 * (thread))
>>>> +#define CPR3_RESULT1_QUOT_MIN_MASK GENMASK(11, 0)
>>>> +#define CPR3_RESULT1_QUOT_MIN_SHIFT 0
>>>> +#define CPR3_RESULT1_QUOT_MAX_MASK GENMASK(23, 12)
>>>> +#define CPR3_RESULT1_QUOT_MAX_SHIFT 12
>>>> +#define CPR3_RESULT1_RO_MIN_MASK GENMASK(27, 24)
>>>> +#define CPR3_RESULT1_RO_MIN_SHIFT 24
>>>> +#define CPR3_RESULT1_RO_MAX_MASK GENMASK(31, 28)
>>>> +#define CPR3_RESULT1_RO_MAX_SHIFT 28
>>>> +
>>>> +#define CPR3_REG_RESULT2(thread) (0x818 + 0x440 * (thread))
>>>> +#define CPR3_RESULT2_STEP_QUOT_MIN_MASK GENMASK(5, 0)
>>>> +#define CPR3_RESULT2_STEP_QUOT_MIN_SHIFT 0
>>>> +#define CPR3_RESULT2_STEP_QUOT_MAX_MASK GENMASK(11, 6)
>>>> +#define CPR3_RESULT2_STEP_QUOT_MAX_SHIFT 6
>>>> +#define CPR3_RESULT2_SENSOR_MIN_MASK GENMASK(23, 16)
>>>> +#define CPR3_RESULT2_SENSOR_MIN_SHIFT 16
>>>> +#define CPR3_RESULT2_SENSOR_MAX_MASK GENMASK(31, 24)
>>>> +#define CPR3_RESULT2_SENSOR_MAX_SHIFT 24
>>>> +
>>>> +#define CPR3_REG_IRQ_EN 0x81C
>>>> +#define CPR3_REG_IRQ_CLEAR 0x820
>>>> +#define CPR3_REG_IRQ_STATUS 0x824
>>>> +#define CPR3_IRQ_UP BIT(3)
>>>> +#define CPR3_IRQ_MID BIT(2)
>>>> +#define CPR3_IRQ_DOWN BIT(1)
>>>> +#define CPR3_IRQ_ALL (CPR3_IRQ_UP | CPR3_IRQ_MID | CPR3_IRQ_DOWN)
>>>> +
>>>> +#define CPR3_REG_TARGET_QUOT(thread, ro) (0x840 + 0x440 * (thread) + 0x4 * (ro))
>>>> +
>>>> +/* Registers found only on controllers that support HW closed-loop. */
>>>> +#define CPR3_REG_PD_THROTTLE 0xE8
>>>> +
>>>> +#define CPR3_REG_HW_CLOSED_LOOP_DISABLED 0x3000
>>>> +#define CPR3_REG_CPR_TIMER_MID_CONT 0x3004
>>>> +#define CPR3_REG_CPR_TIMER_UP_DN_CONT 0x3008
>>>> +
>>>> +/* CPR4 controller specific registers and bit definitions */
>>>> +#define CPR4_REG_CPR_TIMER_CLAMP 0x10
>>>> +#define CPR4_CPR_TIMER_CLAMP_THREAD_AGGREGATION_EN BIT(27)
>>>> +
>>>> +#define CPR4_REG_MISC 0x700
>>>> +#define CPR4_MISC_RESET_STEP_QUOT_LOOP_EN BIT(2)
>>>> +#define CPR4_MISC_THREAD_HAS_ALWAYS_VOTE_EN BIT(3)
>>>> +
>>>> +#define CPR4_REG_SAW_ERROR_STEP_LIMIT 0x7A4
>>>> +#define CPR4_SAW_ERROR_STEP_LIMIT_UP_MASK GENMASK(4, 0)
>>>> +#define CPR4_SAW_ERROR_STEP_LIMIT_UP_SHIFT 0
>>>> +#define CPR4_SAW_ERROR_STEP_LIMIT_DN_MASK GENMASK(9, 5)
>>>> +#define CPR4_SAW_ERROR_STEP_LIMIT_DN_SHIFT 5
>>>> +
>>>> +#define CPR4_REG_MARGIN_TEMP_CORE_TIMERS 0x7A8
>>>> +#define CPR4_MARGIN_TEMP_CORE_TIMERS_SETTLE_VOLTAGE_COUNT_MASK GENMASK(28, 18)
>>>> +#define CPR4_MARGIN_TEMP_CORE_TIMERS_SETTLE_VOLTAGE_COUNT_SHFT 18
>>>> +
>>>> +#define CPR4_REG_MARGIN_ADJ_CTL 0x7F8
>>>> +#define CPR4_MARGIN_ADJ_HW_CLOSED_LOOP_EN BIT(4)
>>>> +#define CPR4_MARGIN_ADJ_PER_RO_KV_MARGIN_EN BIT(7)
>>>> +#define CPR4_MARGIN_ADJ_PMIC_STEP_SIZE_MASK GENMASK(16, 12)
>>>> +#define CPR4_MARGIN_ADJ_PMIC_STEP_SIZE_SHIFT 12
>>>> +#define CPR4_MARGIN_ADJ_KV_MARGIN_ADJ_STEP_QUOT_MASK GENMASK(31, 26)
>>>> +#define CPR4_MARGIN_ADJ_KV_MARGIN_ADJ_STEP_QUOT_SHIFT 26
>>>> +
>>>> +#define CPR4_REG_CPR_MASK_THREAD(thread) (0x80C + 0x440 * (thread))
>>>> +#define CPR4_CPR_MASK_THREAD_DISABLE_THREAD BIT(31)
>>>> +#define CPR4_CPR_MASK_THREAD_RO_MASK4THREAD_MASK GENMASK(15, 0)
>>>> +
>>>> +/* CPRh controller specific registers and bit definitions */
>>>> +#define __CPRH_REG_CORNER(rbase, tbase, tid, cnum) (rbase + (tbase * tid) + (0x4 * cnum))
>>>> +#define CPRH_REG_CORNER(d, t, c) __CPRH_REG_CORNER(d->reg_corner, d->reg_corner_tid, t, c)
>>>> +
>>>> +#define CPRH_CTL_OSM_ENABLED BIT(0)
>>>> +#define CPRH_CTL_BASE_VOLTAGE_MASK GENMASK(10, 1)
>>>> +#define CPRH_CTL_BASE_VOLTAGE_SHIFT 1
>>>> +#define CPRH_CTL_MODE_SWITCH_DELAY_MASK GENMASK(24, 17)
>>>> +#define CPRH_CTL_MODE_SWITCH_DELAY_SHIFT 17
>>>> +#define CPRH_CTL_VOLTAGE_MULTIPLIER_MASK GENMASK(28, 25)
>>>> +#define CPRH_CTL_VOLTAGE_MULTIPLIER_SHIFT 25
>>>> +
>>>> +#define CPRH_CORNER_INIT_VOLTAGE_MASK GENMASK(7, 0)
>>>> +#define CPRH_CORNER_INIT_VOLTAGE_SHIFT 0
>>>> +#define CPRH_CORNER_FLOOR_VOLTAGE_MASK GENMASK(15, 8)
>>>> +#define CPRH_CORNER_FLOOR_VOLTAGE_SHIFT 8
>>>> +#define CPRH_CORNER_QUOT_DELTA_MASK GENMASK(24, 16)
>>>> +#define CPRH_CORNER_QUOT_DELTA_SHIFT 16
>>>> +#define CPRH_CORNER_RO_SEL_MASK GENMASK(28, 25)
>>>> +#define CPRH_CORNER_RO_SEL_SHIFT 25
>>>> +#define CPRH_CORNER_CPR_CL_DISABLE BIT(29)
>>>> +
>>>> +#define CPRH_CORNER_INIT_VOLTAGE_MAX_VALUE 255
>>>> +#define CPRH_CORNER_FLOOR_VOLTAGE_MAX_VALUE 255
>>>> +#define CPRH_CORNER_QUOT_DELTA_MAX_VALUE 511
>>>> +
>>>> +enum cpr_type {
>>>> + CTRL_TYPE_CPR3,
>>>> + CTRL_TYPE_CPR4,
>>>> + CTRL_TYPE_CPRH,
>>>> + CTRL_TYPE_MAX,
>>>> +};
>>>> +
>>>> +/*
>>>> + * struct cpr_thread_desc - CPR Thread-specific parameters
>>>> + *
>>>> + * @controller_id: Identifier of the CPR controller expected by the HW
>>>> + * @ro_scaling_factor: Scaling factor for each ring oscillator entry
>>>> + * @hw_tid: Identifier of the CPR thread expected by the HW
>>>> + * @init_voltage_step: Voltage in uV for number of steps read from fuse array
>>>> + * @init_voltage_width: Bit-width of the voltage read from the fuse array
>>>> + * @sensor_range_start: First sensor ID used by a thread
>>>> + * @sensor_range_end: Last sensor ID used by a thread
>>>> + * @num_fuse_corners: Number of valid entries in fuse_corner_data
>>>> + * @step_quot_init_min: Minimum achievable step quotient for this corner
>>>> + * @step_quot_init_max: Maximum achievable step quotient for this corner
>>>> + * @fuse_corner_data: Parameters for calculation of each fuse corner
>>>> + */
>>>> +struct cpr_thread_desc {
>>>> + u8 controller_id;
>>>> + u8 hw_tid;
>>>> + const int (*ro_scaling_factor)[CPR3_RO_COUNT];
>>>> + int ro_avail_corners;
>>>> + int init_voltage_step;
>>>> + int init_voltage_width;
>>>> + u8 sensor_range_start;
>>>> + u8 sensor_range_end;
>>>> + u8 step_quot_init_min;
>>>> + u8 step_quot_init_max;
>>>> + unsigned int num_fuse_corners;
>>>> + struct fuse_corner_data *fuse_corner_data;
>>>> +};
>>>> +
>>>> +/*
>>>> + * struct cpr_desc - Driver instance-wide CPR parameters
>>>> + *
>>>> + * @cpr_type: Type (base version) of the CPR controller
>>>> + * @num_threads: Max. number of threads supported by this controller
>>>> + * @timer_delay_us: Loop delay time in uS
>>>> + * @timer_updn_delay_us: Voltage after-up/before-down delay time in uS
>>>> + * @timer_cons_up: Wait between consecutive up requests in uS
>>>> + * @timer_cons_down: Wait between consecutive down requests in uS
>>>> + * @up_threshold: Generic corner up threshold
>>>> + * @down_threshold: Generic corner down threshold
>>>> + * @idle_clocks: CPR Sensor: idle timer in cpr clocks unit
>>>> + * @count_mode: CPR Sensor: counting mode
>>>> + * @count_repeat: CPR Sensor: number of times to repeat reading
>>>> + * @gcnt_us: CPR measurement interval in uS
>>>> + * @vreg_step_fixed: Regulator voltage per step (if vreg unusable)
>>>> + * @vreg_step_up_limit: Num. of steps up at once before re-measuring sensors
>>>> + * @vreg_step_down_limit: Num. of steps dn at once before re-measuring sensors
>>>> + * @vdd_settle_time_us: Settling timer to account for one VDD supply step
>>>> + * @corner_settle_time_us: Settle time for corner switch request
>>>> + * @mem_acc_threshold: Memory Accelerator (MEM-ACC) voltage threshold
>>>> + * @apm_threshold: Array Power Mux (APM) voltage threshold
>>>> + * @apm_crossover: Array Power Mux (APM) corner crossover voltage
>>>> + * @apm_hysteresis: Hysteresis for APM V-threshold related calculations
>>>> + * @cpr_base_voltage: Safety: Absolute minimum voltage (uV) on this CPR
>>>> + * @cpr_max_voltage: Safety: Absolute maximum voltage (uV) on this CPR
>>>> + * @pd_throttle_val: CPR Power Domain throttle during voltage switch
>>>> + * @threads: Array containing "CPR Thread" specific parameters
>>>> + * @reduce_to_fuse_uV: Reduce corner max volts (if higher) to fuse ceiling
>>>> + * @reduce_to_corner_uV: Reduce corner max volts (if higher) to corner ceil.
>>>> + * @hw_closed_loop_en: Enable CPR HW Closed-Loop voltage auto-adjustment
>>>> + */
>>>> +struct cpr_desc {
>>>> + enum cpr_type cpr_type;
>>>> + unsigned int num_threads;
>>>> + unsigned int timer_delay_us;
>>>> + u8 timer_updn_delay_us;
>>>> + u8 timer_cons_up;
>>>> + u8 timer_cons_down;
>>>> + u8 up_threshold;
>>>> + u8 down_threshold;
>>>> + u8 idle_clocks;
>>>> + u8 count_mode;
>>>> + u8 count_repeat;
>>>> + u8 gcnt_us;
>>>> + u16 vreg_step_fixed;
>>>> + u8 vreg_step_up_limit;
>>>> + u8 vreg_step_down_limit;
>>>> + u8 vdd_settle_time_us;
>>>> + u8 corner_settle_time_us;
>>>> + int mem_acc_threshold;
>>>> + int apm_threshold;
>>>> + int apm_crossover;
>>>> + int apm_hysteresis;
>>>> + u32 cpr_base_voltage;
>>>> + u32 cpr_max_voltage;
>>>> + u32 pd_throttle_val;
>>>> +
>>>> + const struct cpr_thread_desc **threads;
>>>> + bool reduce_to_fuse_uV;
>>>> + bool reduce_to_corner_uV;
>>>> + bool hw_closed_loop_en;
>>>> +};
>>>> +
>>>> +struct cpr_drv;
>>>> +struct cpr_thread {
>>>> + int num_corners;
>>>> + int id;
>>>> + bool enabled;
>>>> + void __iomem *base;
>>>> + struct clk *cpu_clk;
>>>> + struct corner *corner;
>>>> + struct corner *corners;
>>>> + struct fuse_corner *fuse_corners;
>>>> + struct cpr_drv *drv;
>>>> + struct cpr_ext_data ext_data;
>>>> + struct generic_pm_domain pd;
>>>> + struct device *attached_cpu_dev;
>>>> + struct work_struct restart_work;
>>>> + bool restarting;
>>>> +
>>>> + const struct cpr_fuse *cpr_fuses;
>>>> + const struct cpr_thread_desc *desc;
>>>> +};
>>>> +
>>>> +struct cpr_drv {
>>>> + int irq;
>>>> + unsigned int ref_clk_khz;
>>>> + struct device *dev;
>>>> + struct mutex lock;
>>>> + struct regulator *vreg;
>>>> + struct regmap *tcsr;
>>>> + u32 gcnt;
>>>> + u32 speed_bin;
>>>> + u32 fusing_rev;
>>>> + u32 last_uV;
>>>> + u32 cpr_hw_rev;
>>>> + u32 reg_corner;
>>>> + u32 reg_corner_tid;
>>>> + u32 reg_ctl;
>>>> + u32 reg_status;
>>>> + int fuse_level_set;
>>>> + int extra_corners;
>>>> + unsigned int vreg_step;
>>>> + bool enabled;
>>>> +
>>>> + struct cpr_thread *threads;
>>>> + struct genpd_onecell_data cell_data;
>>>> +
>>>> + const struct cpr_desc *desc;
>>>> + const struct acc_desc *acc_desc;
>>>> + struct dentry *debugfs;
>>>> +};
>>>> +
>>>> +/**
>>>> + * cpr_get_corner_post_vadj() - Get corner post-voltage adjustment values
>>>> + * @opp: Pointer to the corresponding OPP struct
>>>> + * @tid: CPR thread ID
>>>> + * @open_loop: Pointer to the closed-loop adjustment value
>>>> + * @closed_loop: Pointer to the open-loop adjustment value
>>>> + */
>>>> +void cpr_get_corner_post_vadj(struct dev_pm_opp *opp, u32 tid,
>>>> + s32 *open_loop, s32 *closed_loop)
>>>> +{
>>>> + struct device_node *np;
>>>> +
>>>> + /*
>>>> + * There is no of_property_read_s32_index, so we just store the
>>>> + * result into a s32 variable. After all, the OF API is doing
>>>> + * the exact same for of_property_read_s32...
>>>> + */
>>>> + np = dev_pm_opp_get_of_node(opp);
>>>> + if (of_property_read_u32_index(np, "qcom,opp-oloop-vadj", tid, open_loop))
>>>> + *open_loop = 0;
>>>> +
>>>> + if (of_property_read_u32_index(np, "qcom,opp-cloop-vadj", tid, closed_loop))
>>>> + *closed_loop = 0;
>>>> +
>>>> + of_node_put(np);
>>>> +}
>>>> +
>>>> +/**
>>>> + * cpr_get_ro_factor() - Get fuse corner ring oscillator factor
>>>> + * @tdesc: CPR Thread-specific parameters
>>>> + * @fnum: Fuse corner
>>>> + * @ro_idx: Ring Oscillator fuse number
>>>> + *
>>>> + * Not all threads have different scaling factors for each
>>>> + * Fuse Corner: if the RO factors are the same for all corners,
>>>> + * then only one is specified, instead of uselessly repeating
>>>> + * the same array for FC-times.
>>>> + * This function checks for the same and gives back the right
>>>> + * factor for the requested ring oscillator.
>>>> + *
>>>> + * Return: Ring oscillator factor
>>>> + */
>>>> +static int cpr_get_ro_factor(const struct cpr_thread_desc *tdesc,
>>>> + int fnum, int ro_idx)
>>>> +{
>>>> + int ro_fnum;
>>>> +
>>>> + if (tdesc->ro_avail_corners == tdesc->num_fuse_corners)
>>>> + ro_fnum = fnum;
>>>> + else
>>>> + ro_fnum = 0;
>>>> +
>>>> + return tdesc->ro_scaling_factor[ro_fnum][ro_idx];
>>>> +}
>>>> +
>>>> +static void cpr_write(struct cpr_thread *thread, u32 offset, u32 value)
>>>> +{
>>>> + writel(value, thread->base + offset);
>>>> +}
>>>> +
>>>> +static u32 cpr_read(struct cpr_thread *thread, u32 offset)
>>>> +{
>>>> + return readl(thread->base + offset);
>>>> +}
>>>> +
>>>> +static void
>>>> +cpr_masked_write(struct cpr_thread *thread, u32 offset, u32 mask, u32 value)
>>>> +{
>>>> + u32 val;
>>>> +
>>>> + val = readl(thread->base + offset);
>>>> + val &= ~mask;
>>>> + val |= value & mask;
>>>> + writel(val, thread->base + offset);
>>>> +}
>>>> +
>>>> +static void cpr_irq_clr(struct cpr_thread *thread)
>>>> +{
>>>> + cpr_write(thread, CPR3_REG_IRQ_CLEAR, CPR3_IRQ_ALL);
>>>> +}
>>>> +
>>>> +static void cpr_irq_clr_nack(struct cpr_thread *thread)
>>>> +{
>>>> + cpr_irq_clr(thread);
>>>> + cpr_write(thread, CPR3_REG_CONT_CMD, CPR3_CONT_CMD_NACK);
>>>> +}
>>>> +
>>>> +static void cpr_irq_clr_ack(struct cpr_thread *thread)
>>>> +{
>>>> + cpr_irq_clr(thread);
>>>> + cpr_write(thread, CPR3_REG_CONT_CMD, CPR3_CONT_CMD_ACK);
>>>> +}
>>>> +
>>>> +static void cpr_irq_set(struct cpr_thread *thread, u32 int_bits)
>>>> +{
>>>> + /* On CPR-hardened, interrupts are managed by and on firmware */
>>>> + if (thread->drv->desc->cpr_type == CTRL_TYPE_CPRH)
>>>> + return;
>>>> +
>>>> + cpr_write(thread, CPR3_REG_IRQ_EN, int_bits);
>>>> +}
>>>> +
>>>> +/**
>>>> + * cpr_ctl_enable() - Enable CPR thread
>>>> + * @thread: Structure holding CPR thread-specific parameters
>>>> + */
>>>> +static void cpr_ctl_enable(struct cpr_thread *thread)
>>>> +{
>>>> + if (thread->drv->enabled && !thread->restarting) {
>>>> + cpr_masked_write(thread, CPR3_REG_CPR_CTL,
>>>> + CPR3_CPR_CTL_LOOP_EN_MASK,
>>>> + CPR3_CPR_CTL_LOOP_EN_MASK);
>>>> + }
>>>> +}
>>>> +
>>>> +/**
>>>> + * cpr_ctl_disable() - Disable CPR thread
>>>> + * @thread: Structure holding CPR thread-specific parameters
>>>> + */
>>>> +static void cpr_ctl_disable(struct cpr_thread *thread)
>>>> +{
>>>> + const struct cpr_desc *desc = thread->drv->desc;
>>>> +
>>>> + if (desc->cpr_type != CTRL_TYPE_CPRH) {
>>>> + cpr_irq_set(thread, 0);
>>>> + cpr_irq_clr(thread);
>>>> + }
>>>> +
>>>> + cpr_masked_write(thread, CPR3_REG_CPR_CTL,
>>>> + CPR3_CPR_CTL_LOOP_EN_MASK, 0);
>>>> +}
>>>> +
>>>> +/**
>>>> + * cpr_ctl_is_enabled() - Check if thread is enabled
>>>> + * @thread: Structure holding CPR thread-specific parameters
>>>> + *
>>>> + * Return: true if the CPR is enabled, false if it is disabled.
>>>> + */
>>>> +static bool cpr_ctl_is_enabled(struct cpr_thread *thread)
>>>> +{
>>>> + u32 reg_val;
>>>> +
>>>> + reg_val = cpr_read(thread, CPR3_REG_CPR_CTL);
>>>> + return reg_val & CPR3_CPR_CTL_LOOP_EN_MASK;
>>>> +}
>>>> +
>>>> +/**
>>>> + * cpr_check_any_thread_busy() - Check if HW is done processing
>>>> + * @thread: Structure holding CPR thread-specific parameters
>>>> + *
>>>> + * Return: true if the CPR is busy, false if it is ready.
>>>> + */
>>>> +static bool cpr_check_any_thread_busy(struct cpr_thread *thread)
>>>> +{
>>>> + int i;
>>>> +
>>>> + for (i = 0; i < thread->drv->desc->num_threads; i++)
>>>> + if (cpr_read(thread, CPR3_REG_RESULT0(i)) &
>>>> + CPR3_RESULT0_BUSY_MASK)
>>>> + return true;
>>>> +
>>>> + return false;
>>>> +}
>>>> +
>>>> +static void cpr_restart_worker(struct work_struct *work)
>>>> +{
>>>> + struct cpr_thread *thread = container_of(work, struct cpr_thread,
>>>> + restart_work);
>>>> + struct cpr_drv *drv = thread->drv;
>>>> + int i;
>>>> +
>>>> + mutex_lock(&drv->lock);
>>>> +
>>>> + thread->restarting = true;
>>>> + cpr_ctl_disable(thread);
>>>> + disable_irq(drv->irq);
>>>> +
>>>> + mutex_unlock(&drv->lock);
>>>> +
>>>> + for (i = 0; i < 20; i++) {
>>>> + u32 cpr_status = cpr_read(thread, CPR3_REG_CPR_STATUS);
>>>> + u32 ctl = cpr_read(thread, CPR3_REG_CPR_CTL);
>>>> +
>>>> + if ((cpr_status & CPR3_CPR_STATUS_BUSY_MASK) &&
>>>> + !(ctl & CPR3_CPR_CTL_LOOP_EN_MASK))
>>>> + break;
>>>> +
>>>> + udelay(10);
>>>> + }
>>>> +
>>>> + cpr_irq_clr(thread);
>>>> +
>>>> + for (i = 0; i < 20; i++) {
>>>> + u32 status = cpr_read(thread, CPR3_REG_IRQ_STATUS);
>>>> +
>>>> + if (!(status & CPR3_IRQ_ALL))
>>>> + break;
>>>> + udelay(10);
>>>> + }
>>>> +
>>>> + mutex_lock(&drv->lock);
>>>> +
>>>> + thread->restarting = false;
>>>> + enable_irq(drv->irq);
>>>> + cpr_ctl_enable(thread);
>>>> +
>>>> + mutex_unlock(&drv->lock);
>>>> +}
>>>> +
>>>> +/**
>>>> + * cpr_corner_restore() - Restore saved corner level
>>>> + * @thread: Structure holding CPR thread-specific parameters
>>>> + * @corner: Structure holding the saved corner level
>>>> + */
>>>> +static void cpr_corner_restore(struct cpr_thread *thread,
>>>> + struct corner *corner)
>>>> +{
>>>> + struct cpr_drv *drv = thread->drv;
>>>> + struct fuse_corner *fuse = corner->fuse_corner;
>>>> + const struct cpr_thread_desc *tdesc = thread->desc;
>>>> + u32 ro_sel = fuse->ring_osc_idx;
>>>> +
>>>> + cpr_write(thread, CPR3_REG_GCNT(ro_sel), drv->gcnt);
>>>> +
>>>> + cpr_write(thread, CPR3_REG_RO_MASK(tdesc->hw_tid),
>>>> + CPR3_RO_MASK & ~BIT(ro_sel));
>>>> +
>>>> + cpr_write(thread, CPR3_REG_TARGET_QUOT(tdesc->hw_tid, ro_sel),
>>>> + fuse->quot - corner->quot_adjust);
>>>> +
>>>> + if (drv->desc->cpr_type == CTRL_TYPE_CPR4)
>>>> + cpr_masked_write(thread,
>>>> + CPR4_REG_CPR_MASK_THREAD(tdesc->hw_tid),
>>>> + CPR4_CPR_MASK_THREAD_DISABLE_THREAD |
>>>> + CPR4_CPR_MASK_THREAD_RO_MASK4THREAD_MASK, 0);
>>>> +
>>>> + thread->corner = corner;
>>>> + corner->last_uV = corner->uV;
>>>> +}
>>>> +
>>>> +/**
>>>> + * cpr_set_acc() - Set fuse level to the mem-acc
>>>> + * @drv: Main driver structure
>>>> + * @f:�� Fuse level
>>>> + */
>>>> +static void cpr_set_acc(struct cpr_drv *drv, int f)
>>>> +{
>>>> + const struct acc_desc *desc = drv->acc_desc;
>>>> + struct reg_sequence *s = desc->settings;
>>>> + int n = desc->num_regs_per_fuse;
>>>> +
>>>> + if (!s || f == drv->fuse_level_set)
>>>> + return;
>>>> +
>>>> + regmap_multi_reg_write(drv->tcsr, s + (n * f), n);
>>>> + drv->fuse_level_set = f;
>>>> +}
>>>> +
>>>> +/**
>>>> + * cpr_pre_voltage() - Actions to execute before setting voltage
>>>> + * @thread: Structure holding CPR thread-specific parameters
>>>> + * @dir: Enumeration for voltage change direction
>>>> + * @fuse_level: Fuse corner for mem-acc, if supported.
>>>> + *
>>>> + * Return: Zero for success or negative number on errors.
>>>> + */
>>>> +static int cpr_pre_voltage(struct cpr_thread *thread,
>>>> + enum voltage_change_dir dir,
>>>> + int fuse_level)
>>>> +{
>>>> + struct cpr_drv *drv = thread->drv;
>>>> +
>>>> + if (drv->desc->cpr_type == CTRL_TYPE_CPR3 &&
>>>> + drv->desc->pd_throttle_val)
>>>> + cpr_write(thread, CPR3_REG_PD_THROTTLE,
>>>> + drv->desc->pd_throttle_val);
>>>> +
>>>> + if (drv->tcsr && dir == DOWN)
>>>> + cpr_set_acc(drv, fuse_level);
>>>> +
>>>> + return 0;
>>>> +}
>>>> +
>>>> +/**
>>>> + * cpr_post_voltage() - Actions to execute after setting voltage
>>>> + * @thread: Structure holding CPR thread-specific parameters
>>>> + * @dir: Enumeration for voltage change direction
>>>> + * @fuse_level: Fuse corner for mem-acc, if supported.
>>>> + *
>>>> + * Return: Zero for success or negative number on errors.
>>>> + */
>>>> +static int cpr_post_voltage(struct cpr_thread *thread,
>>>> + enum voltage_change_dir dir,
>>>> + int fuse_level)
>>>> +{
>>>> + struct cpr_drv *drv = thread->drv;
>>>> +
>>>> + if (drv->tcsr && dir == UP)
>>>> + cpr_set_acc(drv, fuse_level);
>>>> +
>>>> + if (drv->desc->cpr_type == CTRL_TYPE_CPR3)
>>>> + cpr_write(thread, CPR3_REG_PD_THROTTLE, 0);
>>>> +
>>>> + return 0;
>>>> +}
>>>> +
>>>> +/**
>>>> + * cpr_commit_state() - Set the newly requested voltage
>>>> + * @thread: Structure holding CPR thread-specific parameters
>>>> + *
>>>> + * Return: IRQ_SUCCESS for success, IRQ_NONE if the CPR is disabled.
>>>> + */
>>>> +static int cpr_commit_state(struct cpr_thread *thread)
>>>> +{
>>>> + struct cpr_drv *drv = thread->drv;
>>>> + int min_uV = 0, max_uV = 0, new_uV = 0, fuse_level = 0;
>>>> + enum voltage_change_dir dir;
>>>> + u32 next_irqmask = 0;
>>>> + int ret, i;
>>>> +
>>>> + /* On CPRhardened, control states are managed in firmware */
>>>> + if (drv->desc->cpr_type == CTRL_TYPE_CPRH)
>>>> + return 0;
>>>> +
>>>> + for (i = 0; i < drv->desc->num_threads; i++) {
>>>> + struct cpr_thread *thread = &drv->threads[i];
>>>> +
>>>> + if (!thread->corner)
>>>> + continue;
>>>> +
>>>> + fuse_level = max(fuse_level,
>>>> + (int) (thread->corner->fuse_corner -
>>>> + &thread->fuse_corners[0]));
>>>> +
>>>> + max_uV = max(max_uV, thread->corner->max_uV);
>>>> + min_uV = max(min_uV, thread->corner->min_uV);
>>>> + new_uV = max(new_uV, thread->corner->last_uV);
>>>> + }
>>>> + dev_vdbg(drv->dev, "%s: new uV: %d, last uV: %d\n",
>>>> + __func__, new_uV, drv->last_uV);
>>>> +
>>>> + /*
>>>> + * Safety measure: if the voltage is out of the globally allowed
>>>> + * range, then go out and warn the user.
>>>> + * This should *never* happen.
>>>> + */
>>>> + if (new_uV > drv->desc->cpr_max_voltage ||
>>>> + new_uV < drv->desc->cpr_base_voltage) {
>>>> + dev_warn(drv->dev, "Voltage (%u uV) out of range.", new_uV);
>>>> + return -EINVAL;
>>>> + }
>>>> +
>>>> + if (new_uV == drv->last_uV || fuse_level == drv->fuse_level_set)
>>>> + goto out;
>>>> +
>>>> + if (fuse_level > drv->fuse_level_set)
>>>> + dir = UP;
>>>> + else
>>>> + dir = DOWN;
>>>> +
>>>> + ret = cpr_pre_voltage(thread, fuse_level, dir);
>>>> + if (ret)
>>>> + return ret;
>>>> +
>>>> + dev_vdbg(drv->dev, "setting voltage: %d\n", new_uV);
>>>> +
>>>> + ret = regulator_set_voltage(drv->vreg, new_uV, new_uV);
>>>> + if (ret) {
>>>> + dev_err_ratelimited(drv->dev, "failed to set voltage %d: %d\n", new_uV, ret);
>>>> + return ret;
>>>> + }
>>>> +
>>>> + ret = cpr_post_voltage(thread, fuse_level, dir);
>>>> + if (ret)
>>>> + return ret;
>>>> +
>>>> + drv->last_uV = new_uV;
>>>> +out:
>>>> + if (new_uV > min_uV)
>>>> + next_irqmask |= CPR3_IRQ_DOWN;
>>>> + if (new_uV < max_uV)
>>>> + next_irqmask |= CPR3_IRQ_UP;
>>>> +
>>>> + cpr_irq_set(thread, next_irqmask);
>>>> +
>>>> + return 0;
>>>> +}
>>>> +
>>>> +static unsigned int cpr_get_cur_perf_state(struct cpr_thread *thread)
>>>> +{
>>>> + return thread->corner ? thread->corner - thread->corners + 1 : 0;
>>>> +}
>>>> +
>>>> +/**
>>>> + * cpr_scale() - Calculate new voltage for the received direction
>>>> + * @thread: Structure holding CPR thread-specific parameters
>>>> + * @dir: Enumeration for voltage change direction
>>>> + *
>>>> + * The CPR scales one by one: this function calculates the new
>>>> + * voltage to set when a voltage-UP or voltage-DOWN request comes
>>>> + * and stores it into the per-thread structure that gets passed.
>>>> + */
>>>> +static void cpr_scale(struct cpr_thread *thread, enum voltage_change_dir dir)
>>>> +{
>>>> + struct cpr_drv *drv = thread->drv;
>>>> + const struct cpr_thread_desc *tdesc = thread->desc;
>>>> + u32 val, error_steps;
>>>> + int last_uV, new_uV;
>>>> + struct corner *corner;
>>>> +
>>>> + if (dir != UP && dir != DOWN)
>>>> + return;
>>>> +
>>>> + corner = thread->corner;
>>>> + val = cpr_read(thread, CPR3_REG_RESULT0(tdesc->hw_tid));
>>>> + error_steps = val >> CPR3_RESULT0_ERROR_STEPS_SHIFT;
>>>> + error_steps &= CPR3_RESULT0_ERROR_STEPS_MASK;
>>>> +
>>>> + last_uV = corner->last_uV;
>>>> +
>>>> + if (dir == UP) {
>>>> + if (!(val & CPR3_RESULT0_STEP_UP_MASK))
>>>> + return;
>>>> +
>>>> + /* Calculate new voltage */
>>>> + new_uV = last_uV + drv->vreg_step;
>>>> + new_uV = min(new_uV, corner->max_uV);
>>>> +
>>>> + dev_vdbg(drv->dev, "[T%u] UP - new_uV=%d last_uV=%d p-state=%u st=%u\n",
>>>> + thread->id, new_uV, last_uV,
>>>> + cpr_get_cur_perf_state(thread), error_steps);
>>>> + } else {
>>>> + if (!(val & CPR3_RESULT0_STEP_DN_MASK))
>>>> + return;
>>>> +
>>>> + /* Calculate new voltage */
>>>> + new_uV = last_uV - drv->vreg_step;
>>>> + new_uV = max(new_uV, corner->min_uV);
>>>> + dev_vdbg(drv->dev, "[T%u] DOWN - new_uV=%d last_uV=%d p-state=%u st=%u\n",
>>>> + thread->id, new_uV, last_uV,
>>>> + cpr_get_cur_perf_state(thread), error_steps);
>>>> + }
>>>> + corner->last_uV = new_uV;
>>>> +}
>>>> +
>>>> +/**
>>>> + * cpr_irq_handler() - Handle CPR3/CPR4 status interrupts
>>>> + * @irq: Number of the interrupt
>>>> + * @dev: Pointer to the cpr_thread structure
>>>> + *
>>>> + * Handle the interrupts coming from non-hardened CPR HW as to get
>>>> + * an ok to scale voltages immediately, or to pass error status to
>>>> + * the hardware (either success/ACK or failure/NACK).
>>>> + *
>>>> + * Return: IRQ_SUCCESS for success, IRQ_NONE if the CPR is disabled.
>>>> + */
>>>> +static irqreturn_t cpr_irq_handler(int irq, void *dev)
>>>> +{
>>>> + struct cpr_thread *thread = dev;
>>>> + struct cpr_drv *drv = thread->drv;
>>>> + irqreturn_t ret = IRQ_HANDLED;
>>>> + int i, rc;
>>>> + enum voltage_change_dir dir = NO_CHANGE;
>>>> + u32 val;
>>>> +
>>>> + mutex_lock(&drv->lock);
>>>> +
>>>> + val = cpr_read(thread, CPR3_REG_IRQ_STATUS);
>>>> +
>>>> + dev_vdbg(drv->dev, "IRQ_STATUS = %#02x\n", val);
>>>> +
>>>> + if (!cpr_ctl_is_enabled(thread)) {
>>>> + dev_vdbg(drv->dev, "CPR is disabled\n");
>>>> + ret = IRQ_NONE;
>>>> + } else if (cpr_check_any_thread_busy(thread)) {
>>>> + cpr_irq_clr_nack(thread);
>>>> + dev_dbg(drv->dev, "CPR measurement is not ready\n");
>>>> + } else {
>>>> + /*
>>>> + * Following sequence of handling is as per each IRQ's
>>>> + * priority
>>>> + */
>>>> + if (val & CPR3_IRQ_UP)
>>>> + dir = UP;
>>>> + else if (val & CPR3_IRQ_DOWN)
>>>> + dir = DOWN;
>>>> +
>>>> + if (dir != NO_CHANGE) {
>>>> + for (i = 0; i < drv->desc->num_threads; i++) {
>>>> + thread = &drv->threads[i];
>>>> + cpr_scale(thread, dir);
>>>> + }
>>>> +
>>>> + rc = cpr_commit_state(thread);
>>>> + if (rc)
>>>> + cpr_irq_clr_nack(thread);
>>>> + else
>>>> + cpr_irq_clr_ack(thread);
>>>> + } else if (val & CPR3_IRQ_MID) {
>>>> + dev_dbg(drv->dev, "IRQ occurred for Mid Flag\n");
>>>> + } else {
>>>> + dev_warn(drv->dev, "IRQ occurred for unknown flag (%#08x)\n", val);
>>>> + schedule_work(&thread->restart_work);
>>>> + }
>>>> + }
>>>> +
>>>> + mutex_unlock(&drv->lock);
>>>> +
>>>> + return ret;
>>>> +}
>>>> +
>>>> +static int cpr_switch(struct cpr_drv *drv)
>>>> +{
>>>> + int i, ret;
>>>> + bool enabled = false;
>>>> +
>>>> + if (drv->desc->cpr_type == CTRL_TYPE_CPRH)
>>>> + return 0;
>>>> +
>>>> + for (i = 0; i < drv->desc->num_threads && !enabled; i++)
>>>> + enabled = drv->threads[i].enabled;
>>>> +
>>>> + dev_vdbg(drv->dev, "%s: enabled = %d\n", __func__, enabled);
>>>> +
>>>> + if (enabled == drv->enabled)
>>>> + return 0;
>>>> +
>>>> + if (enabled) {
>>>> + ret = regulator_enable(drv->vreg);
>>>> + if (ret)
>>>> + return ret;
>>>> +
>>>> + drv->enabled = enabled;
>>>> +
>>>> + for (i = 0; i < drv->desc->num_threads; i++)
>>>> + if (drv->threads[i].corner)
>>>> + break;
>>>> +
>>>> + if (i < drv->desc->num_threads) {
>>>> + cpr_irq_clr(&drv->threads[i]);
>>>> +
>>>> + cpr_commit_state(&drv->threads[i]);
>>>> + cpr_ctl_enable(&drv->threads[i]);
>>>> + }
>>>> + } else {
>>>> + for (i = 0; i < drv->desc->num_threads && !enabled; i++)
>>>> + cpr_ctl_disable(&drv->threads[i]);
>>>> +
>>>> + drv->enabled = enabled;
>>>> +
>>>> + ret = regulator_disable(drv->vreg);
>>>> + if (ret < 0)
>>>> + return ret;
>>>> + }
>>>> +
>>>> + return 0;
>>>> +}
>>>> +
>>>> +/**
>>>> + * cpr_enable() - Enables a CPR thread
>>>> + * @thread: Structure holding CPR thread-specific parameters
>>>> + *
>>>> + * Return: Zero for success or negative number on errors.
>>>> + */
>>>> +static int cpr_enable(struct cpr_thread *thread)
>>>> +{
>>>> + struct cpr_drv *drv = thread->drv;
>>>> + int ret;
>>>> +
>>>> + dev_dbg(drv->dev, "Enabling thread %d\n", thread->id);
>>>> +
>>>> + mutex_lock(&drv->lock);
>>>> +
>>>> + thread->enabled = true;
>>>> + ret = cpr_switch(thread->drv);
>>>> +
>>>> + mutex_unlock(&drv->lock);
>>>> +
>>>> + return ret;
>>>> +}
>>>> +
>>>> +/**
>>>> + * cpr_disable() - Disables a CPR thread
>>>> + * @thread: Structure holding CPR thread-specific parameters
>>>> + *
>>>> + * Return: Zero for success or negative number on errors.
>>>> + */
>>>> +static int cpr_disable(struct cpr_thread *thread)
>>>> +{
>>>> + struct cpr_drv *drv = thread->drv;
>>>> + int ret;
>>>> +
>>>> + dev_dbg(drv->dev, "Disabling thread %d\n", thread->id);
>>>> +
>>>> + mutex_lock(&drv->lock);
>>>> +
>>>> + thread->enabled = false;
>>>> + ret = cpr_switch(thread->drv);
>>>> +
>>>> + mutex_unlock(&drv->lock);
>>>> +
>>>> + return ret;
>>>> +}
>>>> +
>>>> +/**
>>>> + * cpr_configure() - Configure main HW parameters
>>>> + * @thread: Structure holding CPR thread-specific parameters
>>>> + *
>>>> + * This function configures the main CPR hardware parameters, such as
>>>> + * internal timers (and delays), sensor ownerships, activates and/or
>>>> + * deactivates cpr-threads and others, as one sequence for all of the
>>>> + * versions supported in this driver. By design, the function may
>>>> + * return a success earlier if the sequence for "a previous version"
>>>> + * has ended.
>>>> + *
>>>> + * Context: The CPR must be clocked before calling this function!
>>>> + *
>>>> + * Return: Zero for success or negative number on errors.
>>>> + */
>>>> +static int cpr_configure(struct cpr_thread *thread)
>>>> +{
>>>> + struct cpr_drv *drv = thread->drv;
>>>> + const struct cpr_desc *desc = drv->desc;
>>>> + const struct cpr_thread_desc *tdesc = thread->desc;
>>>> + u32 val;
>>>> + int i;
>>>> +
>>>> + /* Disable interrupt and CPR */
>>>> + cpr_irq_set(thread, 0);
>>>> + cpr_write(thread, CPR3_REG_CPR_CTL, 0);
>>>> +
>>>> + /* Init and save gcnt */
>>>> + drv->gcnt = drv->ref_clk_khz * desc->gcnt_us;
>>>> + do_div(drv->gcnt, 1000);
>>>> +
>>>> + /* Program the delay count for the timer */
>>>> + val = drv->ref_clk_khz * desc->timer_delay_us;
>>>> + do_div(val, 1000);
>>>> + if (desc->cpr_type == CTRL_TYPE_CPR3) {
>>>> + cpr_write(thread, CPR3_REG_CPR_TIMER_MID_CONT, val);
>>>> +
>>>> + val = drv->ref_clk_khz * desc->timer_updn_delay_us;
>>>> + do_div(val, 1000);
>>>> + cpr_write(thread, CPR3_REG_CPR_TIMER_UP_DN_CONT, val);
>>>> + } else {
>>>> + cpr_write(thread, CPR3_REG_CPR_TIMER_AUTO_CONT, val);
>>>> + }
>>>> + dev_dbg(drv->dev, "Timer count: %#0x (for %d us)\n", val,
>>>> + desc->timer_delay_us);
>>>> +
>>>> + /* Program the control register */
>>>> + val = desc->idle_clocks << CPR3_CPR_CTL_IDLE_CLOCKS_SHIFT;
>>>> + val |= desc->count_mode << CPR3_CPR_CTL_COUNT_MODE_SHIFT;
>>>> + val |= desc->count_repeat << CPR3_CPR_CTL_COUNT_REPEAT_SHIFT;
>>>> + cpr_write(thread, CPR3_REG_CPR_CTL, val);
>>>> +
>>>> + /* Configure CPR default step quotients */
>>>> + val = tdesc->step_quot_init_min << CPR3_CPR_STEP_QUOT_MIN_SHIFT;
>>>> + val |= tdesc->step_quot_init_max << CPR3_CPR_STEP_QUOT_MAX_SHIFT;
>>>> +
>>>> + cpr_write(thread, CPR3_REG_CPR_STEP_QUOT, val);
>>>> +
>>>> + /*
>>>> + * Configure the CPR sensor ownership always on thread 0
>>>> + * TODO: SDM845 has different ownership for sensors!!
>>>> + */
>>>> + for (i = tdesc->sensor_range_start; i < tdesc->sensor_range_end; i++)
>>>> + cpr_write(thread, CPR3_REG_SENSOR_OWNER(i), 0);
>>>> +
>>>> + /* Program Consecutive Up & Down */
>>>> + val = desc->timer_cons_up << CPR3_THRESH_CONS_UP_SHIFT;
>>>> + val |= desc->timer_cons_down << CPR3_THRESH_CONS_DOWN_SHIFT;
>>>> + val |= desc->up_threshold << CPR3_THRESH_UP_THRESH_SHIFT;
>>>> + val |= desc->down_threshold << CPR3_THRESH_DOWN_THRESH_SHIFT;
>>>> + cpr_write(thread, CPR3_REG_THRESH(tdesc->hw_tid), val);
>>>> +
>>>> + /* Mask all ring oscillators for all threads initially */
>>>> + cpr_write(thread, CPR3_REG_RO_MASK(tdesc->hw_tid), CPR3_RO_MASK);
>>>> +
>>>> + /* HW Closed-loop control */
>>>> + if (desc->cpr_type == CTRL_TYPE_CPR3) {
>>>> + cpr_write(thread, CPR3_REG_HW_CLOSED_LOOP_DISABLED,
>>>> + !desc->hw_closed_loop_en);
>>>> + } else {
>>>> + cpr_masked_write(thread, CPR4_REG_MARGIN_ADJ_CTL,
>>>> + CPR4_MARGIN_ADJ_HW_CLOSED_LOOP_EN,
>>>> + desc->hw_closed_loop_en ?
>>>> + CPR4_MARGIN_ADJ_HW_CLOSED_LOOP_EN : 0);
>>>> + }
>>>> +
>>>> + /* Additional configuration for CPR4 and beyond */
>>>> + if (desc->cpr_type < CTRL_TYPE_CPR4)
>>>> + return 0;
>>>> +
>>>> + /* Disable threads initially only on non-hardened CPR4 */
>>>> + if (desc->cpr_type == CTRL_TYPE_CPR4)
>>>> + cpr_masked_write(thread, CPR4_REG_CPR_MASK_THREAD(1),
>>>> + CPR4_CPR_MASK_THREAD_DISABLE_THREAD |
>>>> + CPR4_CPR_MASK_THREAD_RO_MASK4THREAD_MASK,
>>>> + CPR4_CPR_MASK_THREAD_DISABLE_THREAD |
>>>> + CPR4_CPR_MASK_THREAD_RO_MASK4THREAD_MASK);
>>>> +
>>>> + if (tdesc->hw_tid > 0)
>>>> + cpr_masked_write(thread, CPR4_REG_MISC,
>>>> + CPR4_MISC_RESET_STEP_QUOT_LOOP_EN |
>>>> + CPR4_MISC_THREAD_HAS_ALWAYS_VOTE_EN,
>>>> + CPR4_MISC_RESET_STEP_QUOT_LOOP_EN |
>>>> + CPR4_MISC_THREAD_HAS_ALWAYS_VOTE_EN);
>>>> +
>>>> + val = drv->vreg_step;
>>>> + do_div(val, 1000);
>>>> + cpr_masked_write(thread, CPR4_REG_MARGIN_ADJ_CTL,
>>>> + CPR4_MARGIN_ADJ_PMIC_STEP_SIZE_MASK,
>>>> + val << CPR4_MARGIN_ADJ_PMIC_STEP_SIZE_SHIFT);
>>>> +
>>>> + cpr_masked_write(thread, CPR4_REG_SAW_ERROR_STEP_LIMIT,
>>>> + CPR4_SAW_ERROR_STEP_LIMIT_DN_MASK,
>>>> + desc->vreg_step_down_limit <<
>>>> + CPR4_SAW_ERROR_STEP_LIMIT_DN_SHIFT);
>>>> +
>>>> + cpr_masked_write(thread, CPR4_REG_SAW_ERROR_STEP_LIMIT,
>>>> + CPR4_SAW_ERROR_STEP_LIMIT_UP_MASK,
>>>> + desc->vreg_step_up_limit <<
>>>> + CPR4_SAW_ERROR_STEP_LIMIT_UP_SHIFT);
>>>> +
>>>> + cpr_masked_write(thread, CPR4_REG_MARGIN_ADJ_CTL,
>>>> + CPR4_MARGIN_ADJ_PER_RO_KV_MARGIN_EN,
>>>> + CPR4_MARGIN_ADJ_PER_RO_KV_MARGIN_EN);
>>>> +
>>>> + if (tdesc->hw_tid > 0)
>>>> + cpr_masked_write(thread, CPR4_REG_CPR_TIMER_CLAMP,
>>>> + CPR4_CPR_TIMER_CLAMP_THREAD_AGGREGATION_EN,
>>>> + CPR4_CPR_TIMER_CLAMP_THREAD_AGGREGATION_EN);
>>>> +
>>>> + /* Settling timer to account for one VDD supply step */
>>>> + if (desc->vdd_settle_time_us > 0) {
>>>> + u32 m = CPR4_MARGIN_TEMP_CORE_TIMERS_SETTLE_VOLTAGE_COUNT_MASK;
>>>> + u32 s = CPR4_MARGIN_TEMP_CORE_TIMERS_SETTLE_VOLTAGE_COUNT_SHFT;
>>>> +
>>>> + cpr_masked_write(thread, CPR4_REG_MARGIN_TEMP_CORE_TIMERS,
>>>> + m, desc->vdd_settle_time_us << s);
>>>> + }
>>>> +
>>>> + /* Additional configuration for CPR-hardened */
>>>> + if (desc->cpr_type < CTRL_TYPE_CPRH)
>>>> + return 0;
>>>> +
>>>> + /* Settling timer to account for one corner-switch request */
>>>> + if (desc->corner_settle_time_us > 0)
>>>> + cpr_masked_write(thread, drv->reg_ctl,
>>>> + CPRH_CTL_MODE_SWITCH_DELAY_MASK,
>>>> + desc->corner_settle_time_us <<
>>>> + CPRH_CTL_MODE_SWITCH_DELAY_SHIFT);
>>>> +
>>>> + /* Base voltage and multiplier values for CPRh internal calculations */
>>>> + cpr_masked_write(thread, drv->reg_ctl,
>>>> + CPRH_CTL_BASE_VOLTAGE_MASK,
>>>> + (DIV_ROUND_UP(desc->cpr_base_voltage,
>>>> + drv->vreg_step) <<
>>>> + CPRH_CTL_BASE_VOLTAGE_SHIFT));
>>>> +
>>>> + cpr_masked_write(thread, drv->reg_ctl,
>>>> + CPRH_CTL_VOLTAGE_MULTIPLIER_MASK,
>>>> + DIV_ROUND_UP(drv->vreg_step, 1000) <<
>>>> + CPRH_CTL_VOLTAGE_MULTIPLIER_SHIFT);
>>>> +
>>>> + return 0;
>>>> +}
>>>> +
>>>> +static int cprh_dummy_set_performance_state(struct generic_pm_domain *domain,
>>>> + unsigned int state)
>>>> +{
>>>> + return 0;
>>>> +}
>>>> +
>>>> +static int cpr_set_performance_state(struct generic_pm_domain *domain,
>>>> + unsigned int state)
>>>> +{
>>>> + struct cpr_thread *thread = container_of(domain, struct cpr_thread, pd);
>>>> + struct cpr_drv *drv = thread->drv;
>>>> + struct corner *corner, *end;
>>>> + int ret = 0;
>>>> +
>>>> + mutex_lock(&drv->lock);
>>>> +
>>>> + dev_dbg(drv->dev, "setting perf state: %u (prev state: %u thread: %u)\n",
>>>> + state, cpr_get_cur_perf_state(thread), thread->id);
>>>> +
>>>> + /*
>>>> + * Determine new corner we're going to.
>>>> + * Remove one since lowest performance state is 1.
>>>> + */
>>>> + corner = thread->corners + state - 1;
>>>> + end = &thread->corners[thread->num_corners - 1];
>>>> + if (corner > end || corner < thread->corners) {
>>>> + ret = -EINVAL;
>>>> + goto unlock;
>>>> + }
>>>> +
>>>> + cpr_ctl_disable(thread);
>>>> +
>>>> + cpr_irq_clr(thread);
>>>> + if (thread->corner != corner)
>>>> + cpr_corner_restore(thread, corner);
>>>> +
>>>> + ret = cpr_commit_state(thread);
>>>> + if (ret)
>>>> + goto unlock;
>>>> +
>>>> + cpr_ctl_enable(thread);
>>>> +unlock:
>>>> + mutex_unlock(&drv->lock);
>>>> +
>>>> + dev_dbg(drv->dev, "set perf state %u on thread %u\n", state, thread->id);
>>>> +
>>>> + return ret;
>>>> +}
>>>> +
>>>> +/**
>>>> + * cpr3_adjust_quot - Adjust the closed-loop quotients
>>>> + * @ring_osc_factor: Ring oscillator adjustment factor
>>>> + * @volt_closed_loop: Closed-loop voltage adjustment factor
>>>> + *
>>>> + * Calculates the quotient adjustment factor based on closed-loop
>>>> + * quotients and ring oscillator factor.
>>>> + *
>>>> + * Return: Adjusted quotient
>>>> + */
>>>> +static int cpr3_adjust_quot(int ring_osc_factor, int volt_closed_loop)
>>>> +{
>>>> + s64 temp;
>>>> +
>>>> + if (ring_osc_factor == 0 || volt_closed_loop == 0)
>>>> + return 0;
>>>> +
>>>> + temp = (s64)(ring_osc_factor * volt_closed_loop);
>>>> + return (int)div_s64(temp, 1000000);
>>>> +}
>>>> +
>>>> +/**
>>>> + * cpr_fuse_corner_init() - Calculate fuse corner table
>>>> + * @thread: Structure holding CPR thread-specific parameters
>>>> + *
>>>> + * This function populates the fuse corners table by reading the
>>>> + * values from the fuses, eventually adjusting them with a fixed
>>>> + * per-corner offset and doing basic checks about them being
>>>> + * supported by the regulator that is assigned to this CPR - if
>>>> + * it is available (on CPR-Hardened, there is no usable vreg, as
>>>> + * that is protected by the hypervisor).
>>>> + *
>>>> + * Return: Zero for success, negative number on error
>>>> + */
>>>> +static int cpr_fuse_corner_init(struct cpr_thread *thread)
>>>> +{
>>>> + struct cpr_drv *drv = thread->drv;
>>>> + const struct cpr_thread_desc *desc = thread->desc;
>>>> + const struct cpr_fuse *cpr_fuse = thread->cpr_fuses;
>>>> + struct fuse_corner_data *fdata;
>>>> + struct fuse_corner *fuse, *prev_fuse, *end;
>>>> + int i, ret;
>>>> +
>>>> + /* Populate fuse_corner members */
>>>> + fuse = thread->fuse_corners;
>>>> + prev_fuse = &fuse[0];
>>>> + end = &fuse[desc->num_fuse_corners - 1];
>>>> + fdata = desc->fuse_corner_data;
>>>> +
>>>> + for (i = 0; fuse <= end; fuse++, cpr_fuse++, i++, fdata++) {
>>>> + int factor = cpr_get_ro_factor(desc, i, fuse->ring_osc_idx);
>>>> +
>>>> + ret = cpr_populate_fuse_common(drv->dev, fdata, cpr_fuse,
>>>> + fuse, drv->vreg_step,
>>>> + desc->init_voltage_width,
>>>> + desc->init_voltage_step);
>>>> + if (ret)
>>>> + return ret;
>>>> +
>>>> + /*
>>>> + * Adjust the fuse quot with per-fuse-corner closed-loop
>>>> + * voltage adjustment parameters.
>>>> + */
>>>> + fuse->quot += cpr3_adjust_quot(factor, fdata->volt_cloop_adjust);
>>>> +
>>>> + /* CPRh: no regulator access... */
>>>> + if (drv->desc->cpr_type == CTRL_TYPE_CPRH)
>>>> + goto skip_pvs_restrict;
>>>> +
>>>> + /* Re-check if corner voltage range is supported by regulator */
>>>> + ret = cpr_check_vreg_constraints(drv->dev, drv->vreg, fuse);
>>>> + if (ret)
>>>> + return ret;
>>>> +
>>>> +skip_pvs_restrict:
>>>> + if (fuse->uV < prev_fuse->uV)
>>>> + fuse->uV = prev_fuse->uV;
>>>> + prev_fuse = fuse;
>>>> + dev_dbg(drv->dev, "fuse corner %d: [%d %d %d] RO%hhu quot %d\n",
>>>> + i, fuse->min_uV, fuse->uV, fuse->max_uV,
>>>> + fuse->ring_osc_idx, fuse->quot);
>>>> +
>>>> + /* Check if constraints are valid */
>>>> + if (fuse->uV < fuse->min_uV || fuse->uV > fuse->max_uV) {
>>>> + dev_err(drv->dev, "fuse corner %d: Bad voltage range.\n", i);
>>>> + return -EINVAL;
>>>> + }
>>>> + }
>>>> +
>>>> + return 0;
>>>> +}
>>>> +
>>>> +static void cpr3_restrict_corner(struct corner *corner, int threshold,
>>>> + int hysteresis, int step)
>>>> +{
>>>> + if (threshold > corner->min_uV && threshold <= corner->max_uV) {
>>>> + if (corner->uV >= threshold) {
>>>> + corner->min_uV = max(corner->min_uV,
>>>> + threshold - hysteresis);
>>>> + if (corner->min_uV > corner->uV)
>>>> + corner->uV = corner->min_uV;
>>>> + } else {
>>>> + corner->max_uV = threshold;
>>>> + corner->max_uV -= step;
>>>> + }
>>>> + }
>>>> +}
>>>> +
>>>> +/*
>>>> + * cprh_corner_adjust_opps() - Set voltage on each CPU OPP table entry
>>>> + *
>>>> + * On CPR-Hardened, the voltage level is controlled internally through
>>>> + * the OSM hardware: in order to initialize the latter, we have to
>>>> + * communicate the voltage to its driver, so that it will be able to
>>>> + * write the right parameters (as they have to be set both on the CPRh
>>>> + * and on the OSM) on it.
>>>> + * This function is called only for CPRh.
>>>> + *
>>>> + * Return: Zero for success, negative number for error.
>>>> + */
>>>> +static int cprh_corner_adjust_opps(struct cpr_thread *thread)
>>>> +{
>>>> + struct corner *corner = thread->corners;
>>>> + struct cpr_drv *drv = thread->drv;
>>>> + int i, ret;
>>>> +
>>>> + for (i = 0; i < thread->num_corners; i++) {
>>>> + ret = dev_pm_opp_adjust_voltage(thread->attached_cpu_dev,
>>>> + corner[i].freq,
>>>> + corner[i].uV,
>>>> + corner[i].min_uV,
>>>> + corner[i].max_uV);
>>>> + if (ret)
>>>> + break;
>>>> +
>>>> + dev_dbg(drv->dev, "OPP voltage adjusted for %lu kHz, %d uV\n",
>>>> + corner[i].freq, corner[i].uV);
>>>> + }
>>>> +
>>>> + /* If we couldn't adjust voltage for all corners, something went wrong */
>>>> + if (i < thread->num_corners)
>>>> + return -EINVAL;
>>>> +
>>>> + return ret;
>>>> +}
>>>> +
>>>> +/**
>>>> + * cpr3_corner_init() - Calculate and set-up corners for the CPR HW
>>>> + * @thread: Structure holding CPR thread-specific parameters
>>>> + *
>>>> + * This function calculates all the corner parameters by comparing
>>>> + * and interpolating the values read from the various set-points
>>>> + * read from the fuses (also called "fuse corners") to generate and
>>>> + * program to the CPR a lookup table that describes each voltage
>>>> + * step, mapped to a performance level (or corner number).
>>>> + *
>>>> + * It also programs other essential parameters on the CPR and - if
>>>> + * we are dealing with CPR-Hardened, it will also enable the internal
>>>> + * interface between the Operating State Manager (OSM) and the CPRh
>>>> + * in order to achieve CPU DVFS.
>>>> + *
>>>> + * Return: Zero for success, negative number on error
>>>> + */
>>>> +static int cpr3_corner_init(struct cpr_thread *thread)
>>>> +{
>>>> + struct cpr_drv *drv = thread->drv;
>>>> + const struct cpr_desc *desc = drv->desc;
>>>> + const struct cpr_thread_desc *tdesc = thread->desc;
>>>> + const struct cpr_fuse *fuses = thread->cpr_fuses;
>>>> + int i, ret, total_corners, extra_corners, level, scaling = 0;
>>>> + unsigned int fnum, fc;
>>>> + const char *quot_offset;
>>>> + const struct fuse_corner_data *fdata;
>>>> + struct fuse_corner *fuse, *prev_fuse;
>>>> + struct corner *corner, *prev_corner, *end;
>>>> + struct corner_data *cdata;
>>>> + struct dev_pm_opp *opp;
>>>> + unsigned long freq;
>>>> + u32 ring_osc_mask = CPR3_RO_MASK, min_quotient = U32_MAX;
>>>> +
>>>> + corner = thread->corners;
>>>> + prev_corner = &thread->corners[0];
>>>> + end = &corner[thread->num_corners - 1];
>>>> +
>>>> + cdata = devm_kcalloc(drv->dev, thread->num_corners + drv->extra_corners,
>>>> + sizeof(struct corner_data), GFP_KERNEL);
>>>> + if (!cdata)
>>>> + return -ENOMEM;
>>>> +
>>>> + for (level = 1; level <= thread->num_corners; level++) {
>>>> + opp = dev_pm_opp_find_level_exact(&thread->pd.dev, level);
>>>> + if (IS_ERR(opp))
>>>> + return -EINVAL;
>>>> +
>>>> + /*
>>>> + * If there is only one specified qcom,opp-fuse-level, then
>>>> + * it is assumed that this only one is global and valid for
>>>> + * all IDs, so try to get the specific one but, on failure,
>>>> + * go for the global one.
>>>> + */
>>>> + fc = cpr_get_fuse_corner(opp, thread->id);
>>>> + if (fc == 0) {
>>>> + fc = cpr_get_fuse_corner(opp, 0);
>>>> + if (fc == 0) {
>>>> + �� dev_err(drv->dev, "qcom,opp-fuse-level is missing!\n");
>>>> + dev_pm_opp_put(opp);
>>>> + return -EINVAL;
>>>> + }
>>>> + }
>>>> + fnum = fc - 1;
>>>> +
>>>> + freq = cpr_get_opp_hz_for_req(opp, thread->attached_cpu_dev);
>>>> + if (!freq) {
>>>> + thread->num_corners = max(level - 1, 0);
>>>> + end = &thread->corners[thread->num_corners - 1];
>>>> + break;
>>>> + }
>>>> +
>>>> + /*
>>>> + * If any post-vadj (open/closed loop) is not specified, then
>>>> + * it's zero, meaning that it is not required for this corner.
>>>> + */
>>>> + cpr_get_corner_post_vadj(opp, thread->id,
>>>> + &cdata[level - 1].oloop_vadj,
>>>> + &cdata[level - 1].cloop_vadj);
>>>> + cdata[level - 1].fuse_corner = fnum;
>>>> + cdata[level - 1].freq = freq;
>>>> +
>>>> + fuse = &thread->fuse_corners[fnum];
>>>> + dev_dbg(drv->dev, "freq: %lu level: %u fuse level: %u\n",
>>>> + freq, dev_pm_opp_get_level(opp) - 1, fnum);
>>>> + if (freq > fuse->max_freq)
>>>> + fuse->max_freq = freq;
>>>> + dev_pm_opp_put(opp);
>>>> +
>>>> + /*
>>>> + * Make sure that the frequencies in the table are in ascending
>>>> + * order, as this is critical for the algorithm to work.
>>>> + */
>>>> + if (cdata[level - 2].freq > freq) {
>>>> + dev_err(drv->dev, "Frequency table not in ascending order.\n");
>>>> + return -EINVAL;
>>>> + }
>>>> + }
>>>> +
>>>> + if (thread->num_corners < 2) {
>>>> + dev_err(drv->dev, "need at least 2 OPPs to use CPR\n");
>>>> + return -EINVAL;
>>>> + }
>>>> +
>>>> + /*
>>>> + * Get the quotient adjustment scaling factor, according to:
>>>> + *
>>>> + * scaling = min(1000 * (QUOT(corner_N) - QUOT(corner_N-1))
>>>> + * / (freq(corner_N) - freq(corner_N-1)), max_factor)
>>>> + *
>>>> + * QUOT(corner_N): quotient read from fuse for fuse corner N
>>>> + * QUOT(corner_N-1): quotient read from fuse for fuse corner (N - 1)
>>>> + * freq(corner_N): max frequency in MHz supported by fuse corner N
>>>> + * freq(corner_N-1): max frequency in MHz supported by fuse corner
>>>> + * (N - 1)
>>>> + *
>>>> + * Then walk through the corners mapped to each fuse corner
>>>> + * and calculate the quotient adjustment for each one using the
>>>> + * following formula:
>>>> + *
>>>> + * quot_adjust = (freq_max - freq_corner) * scaling / 1000
>>>> + *
>>>> + * freq_max: max frequency in MHz supported by the fuse corner
>>>> + * freq_corner: frequency in MHz corresponding to the corner
>>>> + * scaling: calculated from above equation
>>>> + *
>>>> + *
>>>> + * + +
>>>> + * | v |
>>>> + * q | f c o | f c
>>>> + * u | c l | c
>>>> + * o | f t | f
>>>> + * t | c a | c
>>>> + * | c f g | c f
>>>> + * | e |
>>>> + * +--------------- +----------------
>>>> + * 0 1 2 3 4 5 6 0 1 2 3 4 5 6
>>>> + * corner corner
>>>> + *
>>>> + * c = corner
>>>> + * f = fuse corner
>>>> + *
>>>> + */
>>>> + for (i = 0; corner <= end; corner++, i++) {
>>>> + unsigned long freq_diff_mhz;
>>>> + int ro_fac, vadj, prev_quot;
>>>> +
>>>> + fnum = cdata[i].fuse_corner;
>>>> + fdata = &tdesc->fuse_corner_data[fnum];
>>>> + quot_offset = fuses[fnum].quotient_offset;
>>>> + fuse = &thread->fuse_corners[fnum];
>>>> + ring_osc_mask &= (u16)(~BIT(fuse->ring_osc_idx));
>>>> + if (fnum)
>>>> + prev_fuse = &thread->fuse_corners[fnum - 1];
>>>> + else
>>>> + prev_fuse = NULL;
>>>> +
>>>> + corner->fuse_corner = fuse;
>>>> + corner->freq = cdata[i].freq;
>>>> + corner->uV = fuse->uV;
>>>> +
>>>> + if (prev_fuse) {
>>>> + if (prev_fuse->ring_osc_idx == fuse->ring_osc_idx)
>>>> + quot_offset = NULL;
>>>> +
>>>> + scaling = cpr_calculate_scaling(drv->dev, quot_offset,
>>>> + fdata, corner);
>>>> + if (scaling < 0)
>>>> + return scaling;
>>>> +
>>>> + freq_diff_mhz = fuse->max_freq - corner->freq;
>>>> + do_div(freq_diff_mhz, 1000000); /* now in MHz */
>>>> +
>>>> + corner->quot_adjust = scaling * freq_diff_mhz;
>>>> + do_div(corner->quot_adjust, 1000);
>>>> +
>>>> + /* Fine-tune QUOT (closed-loop) based on fixed values */
>>>> + ro_fac = cpr_get_ro_factor(tdesc, fnum, fuse->ring_osc_idx);
>>>> + vadj = cdata[i].cloop_vadj;
>>>> + corner->quot_adjust -= cpr3_adjust_quot(ro_fac, vadj);
>>>> + dev_vdbg(drv->dev, "Quot fine-tuning to %d for post-vadj=%d\n",
>>>> + corner->quot_adjust, vadj);
>>>> +
>>>> + /*
>>>> + * Make sure that we scale (up) monotonically.
>>>> + * P.S.: Fuse quots can never be descending.
>>>> + */
>>>> + prev_quot = prev_corner->fuse_corner->quot;
>>>> + prev_quot -= prev_corner->quot_adjust;
>>>> + if (fuse->quot - corner->quot_adjust < prev_quot) {
>>>> + int new_adj = prev_corner->fuse_corner->quot;
>>>> +
>>>> + new_adj -= fuse->quot;
>>>> + dev_vdbg(drv->dev, "Monotonic increase forced: %d->%d\n",
>>>> + corner->quot_adjust, new_adj);
>>>> + corner->quot_adjust = new_adj;
>>>> + }
>>>> +
>>>> + corner->uV = cpr_interpolate(corner,
>>>> + drv->vreg_step, fdata);
>>>> + }
>>>> + /* Negative fuse quotients are nonsense. */
>>>> + if (fuse->quot < corner->quot_adjust)
>>>> + return -EINVAL;
>>>> +
>>>> + min_quotient = min(min_quotient,
>>>> + (u32)(fuse->quot - corner->quot_adjust));
>>>> +
>>>> + /* Fine-tune voltages (open-loop) based on fixed values */
>>>> + corner->uV += cdata[i].oloop_vadj;
>>>> + dev_dbg(drv->dev, "Voltage fine-tuning to %d for post-vadj=%d\n",
>>>> + corner->uV, cdata[i].oloop_vadj);
>>>> +
>>>> + corner->max_uV = fuse->max_uV;
>>>> + corner->min_uV = fuse->min_uV;
>>>> + corner->uV = clamp(corner->uV, corner->min_uV, corner->max_uV);
>>>> + dev_vdbg(drv->dev, "Clamped after interpolation: [%d %d %d]\n",
>>>> + corner->min_uV, corner->uV, corner->max_uV);
>>>> +
>>>> + /* Make sure that we scale monotonically here, too. */
>>>> + if (corner->uV < prev_corner->uV)
>>>> + corner->uV = prev_corner->uV;
>>>> +
>>>> + corner->last_uV = corner->uV;
>>>> +
>>>> + /* Reduce the ceiling voltage if needed */
>>>> + if (desc->reduce_to_corner_uV && corner->uV < corner->max_uV)
>>>> + corner->max_uV = corner->uV;
>>>> + else if (desc->reduce_to_fuse_uV && fuse->uV < corner->max_uV)
>>>> + corner->max_uV = max(corner->min_uV, fuse->uV);
>>>> +
>>>> + corner->min_uV = max(corner->max_uV - fdata->range_uV,
>>>> + corner->min_uV);
>>>> +
>>>> + /*
>>>> + * Adjust per-corner floor and ceiling voltages so that
>>>> + * they do not overlap the memory Array Power Mux (APM)
>>>> + * nor the Memory Accelerator (MEM-ACC) threshold voltages.
>>>> + */
>>>> + if (desc->apm_threshold)
>>>> + cpr3_restrict_corner(corner, desc->apm_threshold,
>>>> + desc->apm_hysteresis,
>>>> + drv->vreg_step);
>>>> + if (desc->mem_acc_threshold)
>>>> + cpr3_restrict_corner(corner, desc->mem_acc_threshold,
>>>> + 0, drv->vreg_step);
>>>> +
>>>> + prev_corner = corner;
>>>> + dev_dbg(drv->dev, "corner %d: [%d %d %d] scaling %d quot %d\n", i,
>>>> + corner->min_uV, corner->uV, corner->max_uV, scaling,
>>>> + fuse->quot - corner->quot_adjust);
>>>> + }
>>>> +
>>>> + /* Additional setup for CPRh only */
>>>> + if (desc->cpr_type < CTRL_TYPE_CPRH)
>>>> + return 0;
>>>> +
>>>> + /* If the OPPs can't be adjusted, programming the CPRh is useless */
>>>> + ret = cprh_corner_adjust_opps(thread);
>>>> + if (ret) {
>>>> + dev_err(drv->dev, "Cannot adjust CPU OPP voltages: %d\n", ret);
>>>> + return ret;
>>>> + }
>>>> +
>>>> + total_corners = thread->num_corners;
>>>> + extra_corners = drv->extra_corners;
>>>> +
>>>> + /* If the APM extra corner exists, add it now. */
>>>> + if (desc->apm_crossover && desc->apm_threshold && extra_corners) {
>>>> + /* Program the APM crossover corner on the CPR-Hardened */
>>>> + thread->corners[total_corners].uV = desc->apm_crossover;
>>>> + thread->corners[total_corners].min_uV = desc->apm_crossover;
>>>> + thread->corners[total_corners].max_uV = desc->apm_crossover;
>>>> + thread->corners[total_corners].is_open_loop = true;
>>>> +
>>>> + /*
>>>> + * We have calculated the APM parameters for this clock plan:
>>>> + * make the APM *threshold* available to external callers.
>>>> + * The crossover is used only internally in the CPR.
>>>> + */
>>>> + thread->ext_data.apm_threshold_uV = desc->apm_threshold;
>>>> +
>>>> + dev_dbg(drv->dev, "corner %d (APM): [%d %d %d] Open-Loop\n",
>>>> + total_corners, desc->apm_crossover,
>>>> + desc->apm_crossover, desc->apm_crossover);
>>>> +
>>>> + total_corners++;
>>>> + extra_corners--;
>>>> + }
>>>> +
>>>> + if (desc->mem_acc_threshold && extra_corners) {
>>>> + /* Program the Memory Accelerator threshold corner to CPRh */
>>>> + thread->corners[total_corners].uV = desc->mem_acc_threshold;
>>>> + thread->corners[total_corners].min_uV = desc->mem_acc_threshold;
>>>> + thread->corners[total_corners].max_uV = desc->mem_acc_threshold;
>>>> + thread->corners[total_corners].is_open_loop = true;
>>>> +
>>>> + /*
>>>> + * We have calculated a mem-acc threshold for this clock plan:
>>>> + * make it available to external callers.
>>>> + */
>>>> + thread->ext_data.mem_acc_threshold_uV = desc->mem_acc_threshold;
>>>> +
>>>> + dev_dbg(drv->dev, "corner %d (MEMACC): [%d %d %d] Open-Loop\n",
>>>> + total_corners, desc->mem_acc_threshold,
>>>> + desc->mem_acc_threshold, desc->mem_acc_threshold);
>>>> +
>>>> + total_corners++;
>>>> + extra_corners--;
>>>> + }
>>>> +
>>>> + /*
>>>> + * If there are any extra corners left, it means that even though we
>>>> + * expect to fill in both APM and MEM-ACC crossovers, one couldn't
>>>> + * satisfy requirements, which means that the specified parameters
>>>> + * are wrong: in this case, inform the user and bail out, otherwise
>>>> + * if we go on writing the (invalid) table to the CPR-Hardened, the
>>>> + * hardware (in this case, the CPU) will surely freeze and crash.
>>>> + */
>>>> + if (unlikely(extra_corners)) {
>>>> + dev_err(drv->dev, "APM/MEM-ACC corners: bad parameters.\n");
>>>> + return -EINVAL;
>>>> + }
>>>> + /* Reassign extra_corners, as we have to exclude delta_quot for them */
>>>> + extra_corners = drv->extra_corners;
>>>> +
>>>> + /* Disable the interface between OSM and CPRh */
>>>> + cpr_masked_write(thread, drv->reg_ctl,
>>>> + CPRH_CTL_OSM_ENABLED, 0);
>>>> +
>>>> + /* Program the GCNT before unmasking ring oscillator(s) */
>>>> + for (i = 0; i < CPR3_RO_COUNT; i++) {
>>>> + if (!(ring_osc_mask & BIT(i))) {
>>>> + cpr_write(thread, CPR3_REG_GCNT(i), drv->gcnt);
>>>> + dev_vdbg(drv->dev, "RO%d gcnt=%d\n", i, drv->gcnt);
>>>> + }
>>>> + }
>>>> +
>>>> + /*
>>>> + * Unmask the ring oscillator(s) that we're going to use: it seems
>>>> + * to be mandatory to do this *before* sending the rest of the
>>>> + * CPRhardened specific configuration.
>>>> + */
>>>> + dev_dbg(drv->dev, "Unmasking ring oscillators with mask 0x%x\n", ring_osc_mask);
>>>> + cpr_write(thread, CPR3_REG_RO_MASK(tdesc->hw_tid), ring_osc_mask);
>>>> +
>>>> + /* Setup minimum quotients for ring oscillators */
>>>> + for (i = 0; i < CPR3_RO_COUNT; i++) {
>>>> + u32 tgt_quot_reg = CPR3_REG_TARGET_QUOT(tdesc->hw_tid, i);
>>>> + u32 tgt_quot_val = 0;
>>>> +
>>>> + if (!(ring_osc_mask & BIT(i)))
>>>> + tgt_quot_val = min_quotient;
>>>> +
>>>> + cpr_write(thread, tgt_quot_reg, tgt_quot_val);
>>>> + dev_vdbg(drv->dev, "Programmed min quotient %u for Ring Oscillator %d\n",
>>>> + tgt_quot_val, tgt_quot_reg);
>>>> + }
>>>> +
>>>> + for (i = 0; i < total_corners; i++) {
>>>> + int volt_oloop_steps, volt_floor_steps, delta_quot_steps;
>>>> + int ring_osc;
>>>> + u32 val;
>>>> +
>>>> + fnum = cdata[i].fuse_corner;
>>>> + fuse = &thread->fuse_corners[fnum];
>>>> +
>>>> + val = thread->corners[i].uV - desc->cpr_base_voltage;
>>>> + volt_oloop_steps = DIV_ROUND_UP(val, drv->vreg_step);
>>>> +
>>>> + val = thread->corners[i].min_uV - desc->cpr_base_voltage;
>>>> + volt_floor_steps = DIV_ROUND_UP(val, drv->vreg_step);
>>>> +
>>>> + /*
>>>> + * If we are accessing corners that are not used as
>>>> + * an active DCVS set-point, then always select RO 0
>>>> + * and zero out the delta quotient.
>>>> + */
>>>> + if (i >= thread->num_corners) {
>>>> + ring_osc = 0;
>>>> + delta_quot_steps = 0;
>>>> + } else {
>>>> + ring_osc = fuse->ring_osc_idx;
>>>> + val = fuse->quot - thread->corners[i].quot_adjust;
>>>> + val -= min_quotient;
>>>> + delta_quot_steps = DIV_ROUND_UP(val,
>>>> + CPRH_DELTA_QUOT_STEP_FACTOR);
>>>> + }
>>>> +
>>>> + if (volt_oloop_steps > CPRH_CORNER_INIT_VOLTAGE_MAX_VALUE ||
>>>> + volt_floor_steps > CPRH_CORNER_FLOOR_VOLTAGE_MAX_VALUE ||
>>>> + delta_quot_steps > CPRH_CORNER_QUOT_DELTA_MAX_VALUE) {
>>>> + dev_err(drv->dev, "Invalid cfg: oloop=%d, floor=%d, delta=%d\n",
>>>> + volt_oloop_steps, volt_floor_steps,
>>>> + delta_quot_steps);
>>>> + return -EINVAL;
>>>> + }
>>>> + /* Green light: Go, Go, Go! */
>>>> +
>>>> + /* Set number of open-loop steps */
>>>> + val = volt_oloop_steps << CPRH_CORNER_INIT_VOLTAGE_SHIFT;
>>>> + val &= CPRH_CORNER_INIT_VOLTAGE_MASK;
>>>> +
>>>> + /* Set number of floor voltage steps */
>>>> + val |= (volt_floor_steps << CPRH_CORNER_FLOOR_VOLTAGE_SHIFT) &
>>>> + CPRH_CORNER_FLOOR_VOLTAGE_MASK;
>>>> +
>>>> + /* Set number of target quotient delta steps */
>>>> + val |= (delta_quot_steps << CPRH_CORNER_QUOT_DELTA_SHIFT) &
>>>> + CPRH_CORNER_QUOT_DELTA_MASK;
>>>> +
>>>> + /* Select ring oscillator for this corner */
>>>> + val |= (ring_osc << CPRH_CORNER_RO_SEL_SHIFT) &
>>>> + CPRH_CORNER_RO_SEL_MASK;
>>>> +
>>>> + /* Open loop corner is usually APM/ACC crossover */
>>>> + if (thread->corners[i].is_open_loop) {
>>>> + dev_dbg(drv->dev, "Disabling Closed-Loop on corner %d\n", i);
>>>> + val |= CPRH_CORNER_CPR_CL_DISABLE;
>>>> + }
>>>> + cpr_write(thread, CPRH_REG_CORNER(drv, tdesc->hw_tid, i), val);
>>>> +
>>>> + dev_dbg(drv->dev, "steps [%d]: open-loop %d, floor %d, delta_quot %d\n",
>>>> + i, volt_oloop_steps, volt_floor_steps,
>>>> + delta_quot_steps);
>>>> + }
>>>> +
>>>> + /* YAY! Setup is done! Enable the internal loop to start CPR. */
>>>> + cpr_masked_write(thread, CPR3_REG_CPR_CTL,
>>>> + CPR3_CPR_CTL_LOOP_EN_MASK,
>>>> + CPR3_CPR_CTL_LOOP_EN_MASK);
>>>> +
>>>> + /*
>>>> + * All the writes are going through before enabling internal
>>>> + * communication between the OSM and the CPRh controllers
>>>> + * because we are never using relaxed accessors, but should
>>>> + * we use them, it would be critical to issue a barrier here,
>>>> + * otherwise there is a high risk of hardware lockups due to
>>>> + * under-voltage for the selected CPU clock.
>>>> + *
>>>> + * Please note that the CPR-hardened gets set-up in Linux but
>>>> + * then gets actually used in firmware (and only by the OSM);
>>>> + * after handing it off we will have no more control on it.
>>>> + */
>>>> +
>>>> + /* Enable the interface between OSM and CPRh */
>>>> + cpr_masked_write(thread, drv->reg_ctl,
>>>> + CPRH_CTL_OSM_ENABLED,
>>>> + CPRH_CTL_OSM_ENABLED);
>>>> +
>>>> + /* On success, free cdata manually */
>>>> + devm_kfree(drv->dev, cdata);
>>>> + return 0;
>>>> +}
>>>> +
>>>> +/**
>>>> + * cpr3_init_parameters() - Initialize CPR global parameters
>>>> + * @drv: Main driver structure
>>>> + *
>>>> + * Initial "integrity" checks and setup for the thread-independent parameters.
>>>> + *
>>>> + * Return: Zero for success, negative number on error
>>>> + */
>>>> +static int cpr3_init_parameters(struct cpr_drv *drv)
>>>> +{
>>>> + const struct cpr_desc *desc = drv->desc;
>>>> + struct clk *clk;
>>>> +
>>>> + clk = devm_clk_get(drv->dev, "ref");
>>>> + if (IS_ERR(clk))
>>>> + return PTR_ERR(clk);
>>>> +
>>>> + drv->ref_clk_khz = clk_get_rate(clk);
>>>> + do_div(drv->ref_clk_khz, 1000);
>>>> +
>>>> + /* On CPRh this clock is not always-on... */
>>>> + if (desc->cpr_type == CTRL_TYPE_CPRH)
>>>> + clk_prepare_enable(clk);
>>>> + else
>>>> + devm_clk_put(drv->dev, clk);
>>>> +
>>>> + if (desc->timer_cons_up > CPR3_THRESH_CONS_UP_MASK ||
>>>> + desc->timer_cons_down > CPR3_THRESH_CONS_DOWN_MASK ||
>>>> + desc->up_threshold > CPR3_THRESH_UP_THRESH_MASK ||
>>>> + desc->down_threshold > CPR3_THRESH_DOWN_THRESH_MASK ||
>>>> + desc->idle_clocks > CPR3_CPR_CTL_IDLE_CLOCKS_MASK ||
>>>> + desc->count_mode > CPR3_CPR_CTL_COUNT_MODE_MASK ||
>>>> + desc->count_repeat > CPR3_CPR_CTL_COUNT_REPEAT_MASK)
>>>> + return -EINVAL;
>>>> +
>>>> + /*
>>>> + * Read the CPR version register only from CPR3 onwards:
>>>> + * this is needed to get the additional register offsets.
>>>> + *
>>>> + * Note: When threaded, even if multi-controller, there
>>>> + * is no chance to have different versions at the
>>>> + * same time in the same domain, so it is safe to
>>>> + * check this only on the first controller/thread.
>>>> + */
>>>> + drv->cpr_hw_rev = cpr_read(&drv->threads[0],
>>>> + CPR3_REG_CPR_VERSION);
>>>> + dev_dbg(drv->dev, "CPR hardware revision: 0x%x\n", drv->cpr_hw_rev);
>>>> +
>>>> + if (drv->cpr_hw_rev >= CPRH_CPR_VERSION_4P5) {
>>>> + drv->reg_corner = 0x3500;
>>>> + drv->reg_corner_tid = 0xa0;
>>>> + drv->reg_ctl = 0x3a80;
>>>> + drv->reg_status = 0x3a84;
>>>> + } else {
>>>> + drv->reg_corner = 0x3a00;
>>>> + drv->reg_corner_tid = 0;
>>>> + drv->reg_ctl = 0x3aa0;
>>>> + drv->reg_status = 0x3aa4;
>>>> + }
>>>> +
>>>> + dev_dbg(drv->dev, "up threshold = %u, down threshold = %u\n",
>>>> + desc->up_threshold, desc->down_threshold);
>>>> +
>>>> + return 0;
>>>> +}
>>>> +
>>>> +/**
>>>> + * cpr3_find_initial_corner() - Finds boot-up p-state and enables CPR
>>>> + * @thread: Structure holding CPR thread-specific parameters
>>>> + *
>>>> + * Differently from CPRv1, from CPRv3 onwards when we successfully find
>>>> + * the target boot-up performance state, we must refresh the HW
>>>> + * immediately to guarantee system stability and to avoid overheating
>>>> + * during the boot process, thing that would more likely happen without
>>>> + * this driver doing its job.
>>>> + *
>>>> + * Return: Zero for success, negative number on error
>>>> + */
>>>> +static int cpr3_find_initial_corner(struct cpr_thread *thread)
>>>> +{
>>>> + struct cpr_drv *drv = thread->drv;
>>>> + struct corner *corner;
>>>> + int uV, idx;
>>>> +
>>>> + idx = cpr_find_initial_corner(drv->dev, thread->cpu_clk,
>>>> + thread->corners,
>>>> + thread->num_corners);
>>>> + if (idx < 0)
>>>> + return idx;
>>>> +
>>>> + cpr_ctl_disable(thread);
>>>> +
>>>> + corner = &thread->corners[idx];
>>>> + cpr_corner_restore(thread, corner);
>>>> +
>>>> + uV = regulator_get_voltage(drv->vreg);
>>>> + uV = clamp(uV, corner->min_uV, corner->max_uV);
>>>> +
>>>> + corner->last_uV = uV;
>>>> + if (!drv->last_uV)
>>>> + drv->last_uV = uV;
>>>> +
>>>> + cpr_commit_state(thread);
>>>> + thread->enabled = true;
>>>> + cpr_switch(drv);
>>>> +
>>>> + return 0;
>>>> +}
>>>> +
>>>> +static const int msm8998_gold_scaling_factor[][CPR3_RO_COUNT] = {
>>>> + /* Fuse Corner 0 */
>>>> + {
>>>> + 2857, 3057, 2828, 2952, 2699, 2798, 2446, 2631,
>>>> + 2629, 2578, 2244, 3344, 3289, 3137, 3164, 2655
>>>> + },
>>>> + /* Fuse Corner 1 */
>>>> + {
>>>> + 2857, 3057, 2828, 2952, 2699, 2798, 2446, 2631,
>>>> + 2629, 2578, 2244, 3344, 3289, 3137, 3164, 2655
>>>> + },
>>>> + /* Fuse Corner 2 */
>>>> + {
>>>> + 2603, 2755, 2676, 2777, 2573, 2685, 2465, 2610,
>>>> + 2312, 2423, 2243, 3104, 3022, 3036, 2740, 2303
>>>> + },
>>>> + /* Fuse Corner 3 */
>>>> + {
>>>> + 1901, 2016, 2096, 2228, 2034, 2161, 2077, 2188,
>>>> + 1565, 1870, 1925, 2235, 2205, 2413, 1762, 1478
>>>> + }
>>>> +};
>>>> +
>>>> +static const int msm8998_silver_scaling_factor[][CPR3_RO_COUNT] = {
>>>> + /* Fuse Corner 0 */
>>>> + {
>>>> + 2595, 2794, 2577, 2762, 2471, 2674, 2199, 2553,
>>>> + 3189, 3255, 3192, 2962, 3054, 2982, 2042, 2945
>>>> + },
>>>> + /* Fuse Corner 1 */
>>>> + {
>>>> + 2595, 2794, 2577, 2762, 2471, 2674, 2199, 2553,
>>>> + 3189, 3255, 3192, 2962, 3054, 2982, 2042, 2945
>>>> + },
>>>> + /* Fuse Corner 2 */
>>>> + {
>>>> + 2391, 2550, 2483, 2638, 2382, 2564, 2259, 2555,
>>>> + 2766, 3041, 2988, 2935, 2873, 2688, 2013, 2784
>>>> + },
>>>> + /* Fuse Corner 3 */
>>>> + {
>>>> + 2066, 2153, 2300, 2434, 2220, 2386, 2288, 2465,
>>>> + 2028, 2511, 2487, 2734, 2554, 2117, 1892, 2377
>>>> + }
>>>> +};
>>>> +
>>>> +static const struct cpr_thread_desc msm8998_thread_gold = {
>>>> + .controller_id = 1,
>>>> + .hw_tid = 0,
>>>> + .ro_scaling_factor = msm8998_gold_scaling_factor,
>>>> + .ro_avail_corners = ARRAY_SIZE(msm8998_gold_scaling_factor),
>>>> + .sensor_range_start = 0,
>>>> + .sensor_range_end = 9,
>>>> + .init_voltage_step = 10000,
>>>> + .init_voltage_width = 6,
>>>> + .step_quot_init_min = 9,
>>>> + .step_quot_init_max = 14,
>>>> + .num_fuse_corners = 4,
>>>> + .fuse_corner_data = (struct fuse_corner_data[]){
>>>> + /* fuse corner 0 */
>>>> + {
>>>> + .ref_uV = 756000,
>>>> + .max_uV = 828000,
>>>> + .min_uV = 568000,
>>>> + .range_uV = 32000,
>>>> + .volt_cloop_adjust = 0,
>>>> + .volt_oloop_adjust = 8000,
>>>> + .max_volt_scale = 4,
>>>> + .max_quot_scale = 10,
>>>> + .quot_offset = 0,
>>>> + .quot_scale = 1,
>>>> + .quot_adjust = 0,
>>>> + .quot_offset_scale = 5,
>>>> + .quot_offset_adjust = 0,
>>>> + },
>>>> + /* fuse corner 1 */
>>>> + {
>>>> + .ref_uV = 756000,
>>>> + .max_uV = 900000,
>>>> + .min_uV = 624000,
>>>> + .range_uV = 32000,
>>>> + .volt_cloop_adjust = 0,
>>>> + .volt_oloop_adjust = 0,
>>>> + .max_volt_scale = 320,
>>>> + .max_quot_scale = 350,
>>>> + .quot_offset = 0,
>>>> + .quot_scale = 1,
>>>> + .quot_adjust = 0,
>>>> + .quot_offset_scale = 5,
>>>> + .quot_offset_adjust = 0,
>>>> + },
>>>> + /* fuse corner 2 */
>>>> + {
>>>> + .ref_uV = 828000,
>>>> + .max_uV = 952000,
>>>> + .min_uV = 632000,
>>>> + .range_uV = 32000,
>>>> + .volt_cloop_adjust = 12000,
>>>> + .volt_oloop_adjust = 12000,
>>>> + .max_volt_scale = 620,
>>>> + .max_quot_scale = 750,
>>>> + .quot_offset = 0,
>>>> + .quot_scale = 1,
>>>> + .quot_adjust = 0,
>>>> + .quot_offset_scale = 5,
>>>> + .quot_offset_adjust = 0,
>>>> + },
>>>> + /* fuse corner 3 */
>>>> + {
>>>> + .ref_uV = 1056000,
>>>> + .max_uV = 1136000,
>>>> + .min_uV = 772000,
>>>> + .range_uV = 40000,
>>>> + .volt_cloop_adjust = 50000,
>>>> + .volt_oloop_adjust = 52000,
>>>> + .max_volt_scale = 580,
>>>> + .max_quot_scale = 1040,
>>>> + .quot_offset = 0,
>>>> + .quot_scale = 1,
>>>> + .quot_adjust = 0,
>>>> + .quot_offset_scale = 5,
>>>> + .quot_offset_adjust = 0,
>>>> + },
>>>> + },
>>>> +};
>>>> +
>>>> +static const struct cpr_thread_desc msm8998_thread_silver = {
>>>> + .controller_id = 0,
>>>> + .hw_tid = 0,
>>>> + .ro_scaling_factor = msm8998_silver_scaling_factor,
>>>> + .ro_avail_corners = ARRAY_SIZE(msm8998_silver_scaling_factor),
>>>> + .sensor_range_start = 0,
>>>> + .sensor_range_end = 6,
>>>> + .init_voltage_step = 10000,
>>>> + .init_voltage_width = 6,
>>>> + .step_quot_init_min = 11,
>>>> + .step_quot_init_max = 12,
>>>> + .num_fuse_corners = 4,
>>>> + .fuse_corner_data = (struct fuse_corner_data[]){
>>>> + /* fuse corner 0 */
>>>> + {
>>>> + .ref_uV = 688000,
>>>> + .max_uV = 828000,
>>>> + .min_uV = 568000,
>>>> + .range_uV = 32000,
>>>> + .volt_cloop_adjust = 20000,
>>>> + .volt_oloop_adjust = 40000,
>>>> + .max_volt_scale = 4,
>>>> + .max_quot_scale = 10,
>>>> + .quot_offset = 0,
>>>> + .quot_scale = 1,
>>>> + .quot_adjust = 0,
>>>> + .quot_offset_scale = 5,
>>>> + .quot_offset_adjust = 0,
>>>> + },
>>>> + /* fuse corner 1 */
>>>> + {
>>>> + .ref_uV = 756000,
>>>> + .max_uV = 900000,
>>>> + .min_uV = 632000,
>>>> + .range_uV = 32000,
>>>> + .volt_cloop_adjust = 26000,
>>>> + .volt_oloop_adjust = 24000,
>>>> + .max_volt_scale = 500,
>>>> + .max_quot_scale = 800,
>>>> + .quot_offset = 0,
>>>> + .quot_scale = 1,
>>>> + .quot_adjust = 0,
>>>> + .quot_offset_scale = 5,
>>>> + .quot_offset_adjust = 0,
>>>> + },
>>>> + /* fuse corner 2 */
>>>> + {
>>>> + .ref_uV = 828000,
>>>> + .max_uV = 952000,
>>>> + .min_uV = 664000,
>>>> + .range_uV = 32000,
>>>> + .volt_cloop_adjust = 12000,
>>>> + .volt_oloop_adjust = 12000,
>>>> + .max_volt_scale = 280,
>>>> + .max_quot_scale = 650,
>>>> + .quot_offset = 0,
>>>> + .quot_scale = 1,
>>>> + .quot_adjust = 0,
>>>> + .quot_offset_scale = 5,
>>>> + .quot_offset_adjust = 0,
>>>> +
>>>> + },
>>>> + /* fuse corner 3 */
>>>> + {
>>>> + .ref_uV = 1056000,
>>>> + .max_uV = 1056000,
>>>> + .min_uV = 772000,
>>>> + .range_uV = 40000,
>>>> + .volt_cloop_adjust = 30000,
>>>> + .volt_oloop_adjust = 30000,
>>>> + .max_volt_scale = 430,
>>>> + .max_quot_scale = 800,
>>>> + .quot_offset = 0,
>>>> + .quot_scale = 1,
>>>> + .quot_adjust = 0,
>>>> + .quot_offset_scale = 5,
>>>> + .quot_offset_adjust = 0,
>>>> + },
>>>> + },
>>>> +};
>>>> +
>>>> +static const struct cpr_desc msm8998_cpr_desc = {
>>>> + .cpr_type = CTRL_TYPE_CPRH,
>>>> + .num_threads = 2,
>>>> + .mem_acc_threshold = 852000,
>>>> + .apm_threshold = 800000,
>>>> + .apm_crossover = 880000,
>>>> + .apm_hysteresis = 0,
>>>> + .cpr_base_voltage = 352000,
>>>> + .cpr_max_voltage = 1200000,
>>>> + .timer_delay_us = 5000,
>>>> + .timer_cons_up = 0,
>>>> + .timer_cons_down = 2,
>>>> + .up_threshold = 2,
>>>> + .down_threshold = 2,
>>>> + .idle_clocks = 15,
>>>> + .count_mode = CPR3_CPR_CTL_COUNT_MODE_ALL_AT_ONCE_MIN,
>>>> + .count_repeat = 14,
>>>> + .gcnt_us = 1,
>>>> + .vreg_step_fixed = 4000,
>>>> + .vreg_step_up_limit = 1,
>>>> + .vreg_step_down_limit = 1,
>>>> + .vdd_settle_time_us = 34,
>>>> + .corner_settle_time_us = 6,
>>>> + .reduce_to_corner_uV = true,
>>>> + .hw_closed_loop_en = true,
>>>> + .threads = (const struct cpr_thread_desc *[]) {
>>>> + &msm8998_thread_silver,
>>>> + &msm8998_thread_gold,
>>>> + },
>>>> +};
>>>> +
>>>> +static const struct cpr_acc_desc msm8998_cpr_acc_desc = {
>>>> + .cpr_desc = &msm8998_cpr_desc,
>>>> +};
>>>> +
>>>> +static const int sdm630_gold_scaling_factor[][CPR3_RO_COUNT] = {
>>>> + /* Same RO factors for all fuse corners */
>>>> + {
>>>> + 4040, 3230, 0, 2210, 2560, 2450, 2230, 2220,
>>>> + 2410, 2300, 2560, 2470, 1600, 3120, 2620, 2280
>>>> + }
>>>> +};
>>>> +
>>>> +static const int sdm630_silver_scaling_factor[][CPR3_RO_COUNT] = {
>>>> + /* Same RO factors for all fuse corners */
>>>> + {
>>>> + 3600, 3600, 3830, 2430, 2520, 2700, 1790, 1760,
>>>> + 1970, 1880, 2110, 2010, 2510, 4900, 4370, 4780,
>>>> + }
>>>> +};
>>>> +
>>>> +static const struct cpr_thread_desc sdm630_thread_gold = {
>>>> + .controller_id = 0,
>>>> + .hw_tid = 0,
>>>> + .ro_scaling_factor = sdm630_gold_scaling_factor,
>>>> + .ro_avail_corners = ARRAY_SIZE(sdm630_gold_scaling_factor),
>>>> + .sensor_range_start = 0,
>>>> + .sensor_range_end = 6,
>>>> + .init_voltage_step = 10000,
>>>> + .init_voltage_width = 6,
>>>> + .step_quot_init_min = 12,
>>>> + .step_quot_init_max = 14,
>>>> + .num_fuse_corners = 5,
>>>> + .fuse_corner_data = (struct fuse_corner_data[]){
>>>> + /* fuse corner 0 */
>>>> + {
>>>> + .ref_uV = 644000,
>>>> + .max_uV = 724000,
>>>> + .min_uV = 588000,
>>>> + .range_uV = 40000,
>>>> + .volt_cloop_adjust = -30000,
>>>> + .volt_oloop_adjust = 15000,
>>>> + .max_volt_scale = 10,
>>>> + .max_quot_scale = 300,
>>>> + .quot_offset = 0,
>>>> + .quot_scale = 1,
>>>> + .quot_adjust = 0,
>>>> + .quot_offset_scale = 5,
>>>> + .quot_offset_adjust = 0,
>>>> + },
>>>> + /* fuse corner 1 */
>>>> + {
>>>> + .ref_uV = 788000,
>>>> + .max_uV = 788000,
>>>> + .min_uV = 652000,
>>>> + .range_uV = 40000,
>>>> + .volt_cloop_adjust = -30000,
>>>> + .volt_oloop_adjust = 5000,
>>>> + .max_volt_scale = 320,
>>>> + .max_quot_scale = 275,
>>>> + .quot_offset = 0,
>>>> + .quot_scale = 1,
>>>> + .quot_adjust = 0,
>>>> + .quot_offset_scale = 5,
>>>> + .quot_offset_adjust = 0,
>>>> + },
>>>> + /* fuse corner 2 */
>>>> + {
>>>> + .ref_uV = 868000,
>>>> + .max_uV = 868000,
>>>> + .min_uV = 712000,
>>>> + .range_uV = 40000,
>>>> + .volt_cloop_adjust = -30000,
>>>> + .volt_oloop_adjust = 5000,
>>>> + .max_volt_scale = 350,
>>>> + .max_quot_scale = 800,
>>>> + .quot_offset = 0,
>>>> + .quot_scale = 1,
>>>> + .quot_adjust = 0,
>>>> + .quot_offset_scale = 5,
>>>> + .quot_offset_adjust = 0,
>>>> + },
>>>> + /* fuse corner 3 */
>>>> + {
>>>> + .ref_uV = 988000,
>>>> + .max_uV = 988000,
>>>> + .min_uV = 784000,
>>>> + .range_uV = 66000,
>>>> + .volt_cloop_adjust = -30000,
>>>> + .volt_oloop_adjust = 0,
>>>> + .max_volt_scale = 868,
>>>> + .max_quot_scale = 980,
>>>> + .quot_offset = 0,
>>>> + .quot_scale = 1,
>>>> + .quot_adjust = 0,
>>>> + .quot_offset_scale = 5,
>>>> + .quot_offset_adjust = 0,
>>>> + },
>>>> + /* fuse corner 4 */
>>>> + {
>>>> + .ref_uV = 1068000,
>>>> + .max_uV = 1068000,
>>>> + .min_uV = 844000,
>>>> + .range_uV = 40000,
>>>> + .volt_cloop_adjust = -30000,
>>>> + .volt_oloop_adjust = 0,
>>>> + .max_volt_scale = 868,
>>>> + .max_quot_scale = 980,
>>>> + .quot_offset = 0,
>>>> + .quot_scale = 1,
>>>> + .quot_adjust = 0,
>>>> + .quot_offset_scale = 5,
>>>> + .quot_offset_adjust = 0,
>>>> + },
>>>> + },
>>>> +};
>>>> +
>>>> +static const struct cpr_thread_desc sdm630_thread_silver = {
>>>> + .controller_id = 1,
>>>> + .hw_tid = 0,
>>>> + .ro_scaling_factor = sdm630_silver_scaling_factor,
>>>> + .ro_avail_corners = ARRAY_SIZE(sdm630_silver_scaling_factor),
>>>> + .sensor_range_start = 0,
>>>> + .sensor_range_end = 6,
>>>> + .init_voltage_step = 10000,
>>>> + .init_voltage_width = 6,
>>>> + .step_quot_init_min = 12,
>>>> + .step_quot_init_max = 14,
>>>> + .num_fuse_corners = 3,
>>>> + .fuse_corner_data = (struct fuse_corner_data[]){
>>>> + /* fuse corner 0 */
>>>> + {
>>>> + .ref_uV = 644000,
>>>> + .max_uV = 724000,
>>>> + .min_uV = 588000,
>>>> + .range_uV = 32000,
>>>> + .volt_cloop_adjust = -30000,
>>>> + .volt_oloop_adjust = 0,
>>>> + .max_volt_scale = 10,
>>>> + .max_quot_scale = 360,
>>>> + .quot_offset = 0,
>>>> + .quot_scale = 1,
>>>> + .quot_adjust = 0,
>>>> + .quot_offset_scale = 5,
>>>> + .quot_offset_adjust = 0,
>>>> + },
>>>> + /* fuse corner 1 */
>>>> + {
>>>> + .ref_uV = 788000,
>>>> + .max_uV = 788000,
>>>> + .min_uV = 652000,
>>>> + .range_uV = 40000,
>>>> + .volt_cloop_adjust = -30000,
>>>> + .volt_oloop_adjust = 0,
>>>> + .max_volt_scale = 500,
>>>> + .max_quot_scale = 550,
>>>> + .quot_offset = 0,
>>>> + .quot_scale = 1,
>>>> + .quot_adjust = 0,
>>>> + .quot_offset_scale = 5,
>>>> + .quot_offset_adjust = 0,
>>>> + },
>>>> + /* fuse corner 2 */
>>>> + {
>>>> + .ref_uV = 1068000,
>>>> + .max_uV = 1068000,
>>>> + .min_uV = 800000,
>>>> + .range_uV = 40000,
>>>> + .volt_cloop_adjust = -30000,
>>>> + .volt_oloop_adjust = 0,
>>>> + .max_volt_scale = 2370,
>>>> + .max_quot_scale = 550,
>>>> + .quot_offset = 0,
>>>> + .quot_scale = 1,
>>>> + .quot_adjust = 0,
>>>> + .quot_offset_scale = 5,
>>>> + .quot_offset_adjust = 0,
>>>> + },
>>>> + },
>>>> +};
>>>> +
>>>> +static const struct cpr_desc sdm630_cpr_desc = {
>>>> + .cpr_type = CTRL_TYPE_CPRH,
>>>> + .num_threads = 2,
>>>> + .apm_threshold = 872000,
>>>> + .apm_crossover = 872000,
>>>> + .apm_hysteresis = 20000,
>>>> + .cpr_base_voltage = 400000,
>>>> + .cpr_max_voltage = 1300000,
>>>> + .timer_delay_us = 5000,
>>>> + .timer_cons_up = 0,
>>>> + .timer_cons_down = 2,
>>>> + .up_threshold = 2,
>>>> + .down_threshold = 2,
>>>> + .idle_clocks = 15,
>>>> + .count_mode = CPR3_CPR_CTL_COUNT_MODE_ALL_AT_ONCE_MIN,
>>>> + .count_repeat = 14,
>>>> + .gcnt_us = 1,
>>>> + .vreg_step_fixed = 4000,
>>>> + .vreg_step_up_limit = 1,
>>>> + .vreg_step_down_limit = 1,
>>>> + .vdd_settle_time_us = 34,
>>>> + .corner_settle_time_us = 5,
>>>> + .reduce_to_corner_uV = true,
>>>> + .hw_closed_loop_en = true,
>>>> + .threads = (const struct cpr_thread_desc *[]) {
>>>> + &sdm630_thread_gold,
>>>> + &sdm630_thread_silver,
>>>> + },
>>>> +};
>>>> +
>>>> +static const struct cpr_acc_desc sdm630_cpr_acc_desc = {
>>>> + .cpr_desc = &sdm630_cpr_desc,
>>>> +};
>>>> +
>>>> +static unsigned int cpr_get_performance_state(struct generic_pm_domain *genpd,
>>>> + struct dev_pm_opp *opp)
>>>> +{
>>>> + return dev_pm_opp_get_level(opp);
>>>> +}
>>>> +
>>>> +static int cpr_power_off(struct generic_pm_domain *domain)
>>>> +{
>>>> + struct cpr_thread *thread = container_of(domain, struct cpr_thread, pd);
>>>> +
>>>> + return cpr_disable(thread);
>>>> +}
>>>> +
>>>> +static int cpr_power_on(struct generic_pm_domain *domain)
>>>> +{
>>>> + struct cpr_thread *thread = container_of(domain, struct cpr_thread, pd);
>>>> +
>>>> + return cpr_enable(thread);
>>>> +}
>>>> +
>>>> +static void cpr_pd_detach_dev(struct generic_pm_domain *domain,
>>>> + struct device *dev)
>>>> +{
>>>> + struct cpr_thread *thread = container_of(domain, struct cpr_thread, pd);
>>>> + struct cpr_drv *drv = thread->drv;
>>>> +
>>>> + mutex_lock(&drv->lock);
>>>> +
>>>> + dev_dbg(drv->dev, "detach callback for: %s\n", dev_name(dev));
>>>> + thread->attached_cpu_dev = NULL;
>>>> +
>>>> + mutex_unlock(&drv->lock);
>>>> +}
>>>> +
>>>> +static int cpr_pd_attach_dev(struct generic_pm_domain *domain,
>>>> + struct device *dev)
>>>> +{
>>>> + struct cpr_thread *thread = container_of(domain, struct cpr_thread, pd);
>>>> + struct cpr_drv *drv = thread->drv;
>>>> + const struct acc_desc *acc_desc = drv->acc_desc;
>>>> + bool cprh_opp_remove_table = false;
>>>> + int ret = 0;
>>>> +
>>>> + mutex_lock(&drv->lock);
>>>> +
>>>> + dev_dbg(drv->dev, "attach callback for: %s\n", dev_name(dev));
>>>> +
>>>> + /*
>>>> + * This driver only supports scaling voltage for a CPU cluster
>>>> + * where all CPUs in the cluster share a single regulator.
>>>> + * Therefore, save the struct device pointer only for the first
>>>> + * CPU device that gets attached. There is no need to do any
>>>> + * additional initialization when further CPUs get attached.
>>>> + * This is not an error condition.
>>>> + */
>>>> + if (thread->attached_cpu_dev)
>>>> + goto unlock;
>>>> +
>>>> + /*
>>>> + * cpr_scale_voltage() requires the direction (if we are changing
>>>> + * to a higher or lower OPP). The first time
>>>> + * cpr_set_performance_state() is called, there is no previous
>>>> + * performance state defined. Therefore, we call
>>>> + * cpr_find_initial_corner() that gets the CPU clock frequency
>>>> + * set by the bootloader, so that we can determine the direction
>>>> + * the first time cpr_set_performance_state() is called.
>>>> + */
>>>> + thread->cpu_clk = devm_clk_get(dev, NULL);
>>>> + if (drv->desc->cpr_type < CTRL_TYPE_CPRH && IS_ERR(thread->cpu_clk)) {
>>>> + ret = PTR_ERR(thread->cpu_clk);
>>>> + if (ret != -EPROBE_DEFER)
>>>> + dev_err(drv->dev, "could not get cpu clk: %d\n", ret);
>>>> + goto unlock;
>>>> + }
>>>> + thread->attached_cpu_dev = dev;
>>>> +
>>>> + /*
>>>> + * We are exporting the APM and MEM-ACC thresholds to the caller;
>>>> + * while APM is necessary in the CPU CPR case, MEM-ACC may not be,
>>>> + * depending on the SoC and on fuses.
>>>> + * Initialize both to an invalid value, so that the caller can check
>>>> + * if they got calculated or read from fuses in this driver.
>>>> + */
>>>> + thread->ext_data.apm_threshold_uV = -1;
>>>> + thread->ext_data.mem_acc_threshold_uV = -1;
>>>> + dev_set_drvdata(thread->attached_cpu_dev, &thread->ext_data);
>>>> +
>>>> + dev_dbg(drv->dev, "using cpu clk from: %s\n",
>>>> + dev_name(thread->attached_cpu_dev));
>>>> +
>>>> + /*
>>>> + * Everything related to (virtual) corners has to be initialized
>>>> + * here, when attaching to the power domain, since we need to know
>>>> + * the maximum frequency for each fuse corner, and this is only
>>>> + * available after the cpufreq driver has attached to us.
>>>> + * The reason for this is that we need to know the highest
>>>> + * frequency associated with each fuse corner.
>>>> + */
>>>> + ret = dev_pm_opp_get_opp_count(&thread->pd.dev);
>>>> + if (ret < 0) {
>>>> + dev_err(drv->dev, "could not get OPP count\n");
>>>> + thread->attached_cpu_dev = NULL;
>>>> + goto unlock;
>>>> + }
>>>> + thread->num_corners = ret;
>>>> +
>>>> + thread->corners = devm_kcalloc(drv->dev,
>>>> + thread->num_corners +
>>>> + drv->extra_corners,
>>>> + sizeof(*thread->corners),
>>>> + GFP_KERNEL);
>>>> + if (!thread->corners) {
>>>> + ret = -ENOMEM;
>>>> + goto unlock;
>>>> + }
>>>> +
>>>> + /*
>>>> + * If we are on CPR-Hardened we have to make sure that the attached
>>>> + * device has a OPP table installed, as we're going to modify it here
>>>> + * with our calculations based on qfprom values.
>>>> + */
>>>> + if (drv->desc->cpr_type == CTRL_TYPE_CPRH) {
>>>> + ret = dev_pm_opp_of_add_table(dev);
>>>> + if (ret && ret != -EEXIST) {
>>>> + dev_err(drv->dev, "Cannot add table: %d\n", ret);
>>>> + goto unlock;
>>>> + }
>>>> + cprh_opp_remove_table = true;
>>>> + }
>>>> +
>>>> + ret = cpr3_corner_init(thread);
>>>> + if (ret)
>>>> + goto exit;
>>>> +
>>>> + if (drv->desc->cpr_type < CTRL_TYPE_CPRH) {
>>>> + ret = cpr3_find_initial_corner(thread);
>>>> + if (ret)
>>>> + goto exit;
>>>> +
>>>> + if (acc_desc->config)
>>>> + regmap_multi_reg_write(drv->tcsr, acc_desc->config,
>>>> + acc_desc->num_regs_per_fuse);
>>>> +
>>>> + /* Enable ACC if required */
>>>> + if (acc_desc->enable_mask)
>>>> + regmap_update_bits(drv->tcsr, acc_desc->enable_reg,
>>>> + acc_desc->enable_mask,
>>>> + acc_desc->enable_mask);
>>>> + }
>>>> + dev_info(drv->dev, "thread %d initialized with %u OPPs\n",
>>>> + thread->id, thread->num_corners);
>>>> +exit:
>>>> + /*
>>>> + * If we are on CPRh and we reached an error condition, we installed
>>>> + * the OPP table but we haven't done any setup on it, nor we ever will.
>>>> + * In order to leave a clean state, remove the table.
>>>> + */
>>>> + if (ret && cprh_opp_remove_table)
>>>> + dev_pm_opp_of_remove_table(thread->attached_cpu_dev);
>>>> +unlock:
>>>> + mutex_unlock(&drv->lock);
>>>> +
>>>> + return ret;
>>>> +}
>>>> +
>>>> +static int cpr3_debug_info_show(struct seq_file *s, void *unused)
>>>> +{
>>>> + u32 ro_sel, ctl, irq_status, reg, quot;
>>>> + struct cpr_thread *thread = s->private;
>>>> + struct corner *corner = thread->corners;
>>>> + struct fuse_corner *fuse = thread->fuse_corners;
>>>> + unsigned int i;
>>>> +
>>>> + const struct {
>>>> + const char *name;
>>>> + uint32_t mask;
>>>> + uint8_t shift;
>>>> + } result0_fields[] = {
>>>> + { "busy", 1, 0 },
>>>> + { "step_dn", 1, 1 },
>>>> + { "step_up", 1, 2 },
>>>> + { "error_steps", CPR3_RESULT0_ERROR_STEPS_MASK,
>>>> + CPR3_RESULT0_ERROR_STEPS_SHIFT },
>>>> + { "error", CPR3_RESULT0_ERROR_MASK, CPR3_RESULT0_ERROR_SHIFT },
>>>> + { "negative", 1, 20 },
>>>> + }, result1_fields[] = {
>>>> + { "quot_min", CPR3_RESULT1_QUOT_MIN_MASK,
>>>> + CPR3_RESULT1_QUOT_MIN_SHIFT },
>>>> + { "quot_max", CPR3_RESULT1_QUOT_MAX_MASK,
>>>> + CPR3_RESULT1_QUOT_MAX_SHIFT },
>>>> + { "ro_min", CPR3_RESULT1_RO_MIN_MASK,
>>>> + CPR3_RESULT1_RO_MIN_SHIFT },
>>>> + { "ro_max", CPR3_RESULT1_RO_MAX_MASK,
>>>> + CPR3_RESULT1_RO_MAX_SHIFT },
>>>> + }, result2_fields[] = {
>>>> + { "qout_step_min", CPR3_RESULT2_STEP_QUOT_MIN_MASK,
>>>> + CPR3_RESULT2_STEP_QUOT_MIN_SHIFT },
>>>> + { "qout_step_max", CPR3_RESULT2_STEP_QUOT_MAX_MASK,
>>>> + CPR3_RESULT2_STEP_QUOT_MAX_SHIFT },
>>>> + { "sensor_min", CPR3_RESULT2_SENSOR_MIN_MASK,
>>>> + CPR3_RESULT2_SENSOR_MIN_SHIFT },
>>>> + { "sensor_max", CPR3_RESULT2_SENSOR_MAX_MASK,
>>>> + CPR3_RESULT2_SENSOR_MAX_SHIFT },
>>>> + };
>>>> +
>>>> + if (thread->drv->desc->cpr_type < CTRL_TYPE_CPRH)
>>>> + seq_printf(s, "current_volt = %d uV\n", thread->drv->last_uV);
>>>> +
>>>> + irq_status = cpr_read(thread, CPR3_REG_IRQ_STATUS);
>>>> + seq_printf(s, "irq_status = %#02X\n", irq_status);
>>>> +
>>>> + ctl = cpr_read(thread, CPR3_REG_CPR_CTL);
>>>> + seq_printf(s, "cpr_ctl = %#02X\n", ctl);
>>>> +
>>>> + seq_printf(s, "thread %d - hw tid: %u - enabled: %d:\n",
>>>> + thread->id, thread->desc->hw_tid, thread->enabled);
>>>> + seq_printf(s, "%d corners, derived from %d fuse corners\n",
>>>> + thread->num_corners, thread->desc->num_fuse_corners);
>>>> +
>>>> + for (i = 0; i < thread->num_corners; i++, corner++)
>>>> + seq_printf(s, "corner %d - uV=[%d %d %d] quot=%d freq=%lu\n",
>>>> + i, corner->min_uV, corner->uV, corner->max_uV,
>>>> + corner->quot_adjust, corner->freq);
>>>> +
>>>> + for (i = 0; i < thread->desc->num_fuse_corners; i++, fuse++)
>>>> + seq_printf(s, "fuse %d - uV=[%d %d %d] quot=%d freq=%lu\n",
>>>> + i, fuse->min_uV, fuse->uV, fuse->max_uV,
>>>> + fuse->quot, corner->freq);
>>>> +
>>>> + seq_printf(s, "requested voltage: %d uV\n", thread->corner->last_uV);
>>>> +
>>>> + ro_sel = corner->fuse_corner->ring_osc_idx;
>>>> + quot = cpr_read(thread, CPR3_REG_TARGET_QUOT(i, ro_sel));
>>>> + seq_printf(s, "quot_target (%u) = %#02X\n", ro_sel, quot);
>>>> +
>>>> + reg = cpr_read(thread, CPR3_REG_RESULT0(i));
>>>> + seq_printf(s, "cpr_result_0 = %#02X\n [", reg);
>>>> + for (i = 0; i < ARRAY_SIZE(result0_fields); i++)
>>>> + seq_printf(s, "%s%s = %u",
>>>> + i ? ", " : "",
>>>> + result0_fields[i].name,
>>>> + (reg >> result0_fields[i].shift) &
>>>> + result0_fields[i].mask);
>>>> + seq_puts(s, "]\n");
>>>> + reg = cpr_read(thread, CPR3_REG_RESULT1(i));
>>>> + seq_printf(s, "cpr_result_1 = %#02X\n [", reg);
>>>> + for (i = 0; i < ARRAY_SIZE(result1_fields); i++)
>>>> + seq_printf(s, "%s%s = %u",
>>>> + i ? ", " : "",
>>>> + result1_fields[i].name,
>>>> + (reg >> result1_fields[i].shift) &
>>>> + result1_fields[i].mask);
>>>> + seq_puts(s, "]\n");
>>>> + reg = cpr_read(thread, CPR3_REG_RESULT2(i));
>>>> + seq_printf(s, "cpr_result_2 = %#02X\n [", reg);
>>>> + for (i = 0; i < ARRAY_SIZE(result2_fields); i++)
>>>> + seq_printf(s, "%s%s = %u",
>>>> + i ? ", " : "",
>>>> + result2_fields[i].name,
>>>> + (reg >> result2_fields[i].shift) &
>>>> + result2_fields[i].mask);
>>>> + seq_puts(s, "]\n");
>>>> +
>>>> + return 0;
>>>> +}
>>>> +DEFINE_SHOW_ATTRIBUTE(cpr3_debug_info);
>>>> +
>>>> +static void cpr3_debugfs_init(struct cpr_drv *drv)
>>>> +{
>>>> + int i;
>>>> +
>>>> + drv->debugfs = debugfs_create_dir("qcom_cpr3", NULL);
>>>> +
>>>> + for (i = 0; i < drv->desc->num_threads; i++) {
>>>> + char buf[50];
>>>> +
>>>> + snprintf(buf, sizeof(buf), "thread%d", i);
>>>> +
>>>> + debugfs_create_file(buf, 0444, drv->debugfs, &drv->threads[i],
>>>> + &cpr3_debug_info_fops);
>>>> + }
>>>> +}
>>>> +
>>>> +/**
>>>> + * cpr_thread_init() - Initialize CPR thread related parameters
>>>> + * @drv: Main driver structure
>>>> + * @tid: Thread ID
>>>> + *
>>>> + * Return: Zero for success, negative number on error
>>>> + */
>>>> +static int cpr_thread_init(struct cpr_drv *drv, int tid)
>>>> +{
>>>> + const struct cpr_desc *desc = drv->desc;
>>>> + const struct cpr_thread_desc *tdesc = desc->threads[tid];
>>>> + struct cpr_thread *thread = &drv->threads[tid];
>>>> + int ret;
>>>> +
>>>> + if (tdesc->step_quot_init_min > CPR3_CPR_STEP_QUOT_MIN_MASK ||
>>>> + tdesc->step_quot_init_max > CPR3_CPR_STEP_QUOT_MAX_MASK)
>>>> + return -EINVAL;
>>>> +
>>>> + thread->id = tid;
>>>> + thread->drv = drv;
>>>> + thread->desc = tdesc;
>>>> + thread->fuse_corners = devm_kcalloc(drv->dev,
>>>> + tdesc->num_fuse_corners +
>>>> + drv->extra_corners,
>>>> + sizeof(*thread->fuse_corners),
>>>> + GFP_KERNEL);
>>>> + if (!thread->fuse_corners)
>>>> + return -ENOMEM;
>>>> +
>>>> + thread->cpr_fuses = cpr_get_fuses(drv->dev, tid,
>>>> + tdesc->num_fuse_corners);
>>>> + if (IS_ERR(thread->cpr_fuses))
>>>> + return PTR_ERR(thread->cpr_fuses);
>>>> +
>>>> + ret = cpr_populate_ring_osc_idx(thread->drv->dev, thread->fuse_corners,
>>>> + thread->cpr_fuses,
>>>> + tdesc->num_fuse_corners);
>>>> + if (ret)
>>>> + return ret;
>>>> +
>>>> + ret = cpr_fuse_corner_init(thread);
>>>> + if (ret)
>>>> + return ret;
>>>> +
>>>> + thread->pd.name = devm_kasprintf(drv->dev, GFP_KERNEL,
>>>> + "%s_thread%d",
>>>> + drv->dev->of_node->full_name,
>>>> + thread->id);
>>>> + if (!thread->pd.name)
>>>> + return -EINVAL;
>>>> +
>>>> + thread->pd.power_off = cpr_power_off;
>>>> + thread->pd.power_on = cpr_power_on;
>>>> + thread->pd.opp_to_performance_state = cpr_get_performance_state;
>>>> + thread->pd.attach_dev = cpr_pd_attach_dev;
>>>> + thread->pd.detach_dev = cpr_pd_detach_dev;
>>>> +
>>>> + /* CPR-Hardened performance states are managed in firmware */
>>>> + if (desc->cpr_type == CTRL_TYPE_CPRH)
>>>> + thread->pd.set_performance_state = cprh_dummy_set_performance_state;
>>>> + else
>>>> + thread->pd.set_performance_state = cpr_set_performance_state;
>>>> +
>>>> + /* Anything later than CPR1 must be always-on for now */
>>>> + thread->pd.flags = GENPD_FLAG_ALWAYS_ON;
>>>> +
>>>> + drv->cell_data.domains[tid] = &thread->pd;
>>>> +
>>>> + ret = pm_genpd_init(&thread->pd, NULL, false);
>>>> + if (ret)
>>>> + return ret;
>>>> +
>>>> + /* On CPRhardened, the interrupts are managed in firmware */
>>>> + if (desc->cpr_type < CTRL_TYPE_CPRH) {
>>>> + INIT_WORK(&thread->restart_work, cpr_restart_worker);
>>>> +
>>>> + ret = devm_request_threaded_irq(drv->dev, drv->irq,
>>>> + NULL, cpr_irq_handler,
>>>> + IRQF_ONESHOT |
>>>> + IRQF_TRIGGER_RISING,
>>>> + "cpr", drv);
>>>> + if (ret)
>>>> + return ret;
>>>> + }
>>>> +
>>>> + return 0;
>>>> +}
>>>> +
>>>> +/**
>>>> + * cpr3_resources_init() - Initialize resources used by this driver
>>>> + * @pdev: Platform device
>>>> + * @drv: Main driver structure
>>>> + *
>>>> + * Return: Zero for success, negative number on error
>>>> + */
>>>> +static int cpr3_resources_init(struct platform_device *pdev,
>>>> + struct cpr_drv *drv)
>>>> +{
>>>> + const struct cpr_desc *desc = drv->desc;
>>>> + struct cpr_thread *threads = drv->threads;
>>>> + unsigned int i;
>>>> + u8 cid_mask = 0;
>>>> +
>>>> + /*
>>>> + * Here, we are accounting for the following usecases:
>>>> + * - One controller
>>>> + * - One or multiple threads on the same iospace
>>>> + *
>>>> + * - Multiple controllers
>>>> + * - Each controller has its own iospace and each
>>>> + * may have one or multiple threads in their
>>>> + * parent controller's iospace
>>>> + *
>>>> + * Then, to avoid complicating the code for no reason,
>>>> + * this also needs a mandatory order in the list of
>>>> + * threads which implies that all of them from the same
>>>> + * controllers are specified sequentially. As an example:
>>>> + *
>>>> + * C0-T0, C0-T1...C0-Tn, C1-T0, C1-T1...C1-Tn
>>>> + */
>>>> + for (i = 0; i < desc->num_threads; i++) {
>>>> + u8 cid = desc->threads[i]->controller_id;
>>>> +
>>>> + if (cid_mask & BIT(cid)) {
>>>> + if (desc->threads[i - 1]->controller_id != cid) {
>>>> + dev_err(drv->dev, "Bad threads order. Please fix!\n");
>>>> + return -EINVAL;
>>>> + }
>>>> + threads[i].base = threads[i - 1].base;
>>>> + continue;
>>>> + }
>>>> + threads[i].base = devm_platform_ioremap_resource(pdev, cid);
>>>> + if (IS_ERR(threads[i].base))
>>>> + return PTR_ERR(threads[i].base);
>>>> + cid_mask |= BIT(cid);
>>>> + }
>>>> + return 0;
>>>> +}
>>>> +
>>>> +static int cpr_probe(struct platform_device *pdev)
>>>> +{
>>>> + struct device *dev = &pdev->dev;
>>>> + struct cpr_drv *drv;
>>>> + const struct cpr_desc *desc;
>>>> + const struct cpr_acc_desc *data;
>>>> + struct device_node *np;
>>>> + unsigned int i;
>>>> + int ret;
>>>> +
>>>> + data = of_device_get_match_data(dev);
>>>> + if (!data || !data->cpr_desc)
>>>> + return -EINVAL;
>>>> +
>>>> + desc = data->cpr_desc;
>>>> +
>>>> + /* CPRh disallows MEM-ACC access from the HLOS */
>>>> + if (!data->acc_desc && desc->cpr_type < CTRL_TYPE_CPRH)
>>>> + return -EINVAL;
>>>> +
>>>> + drv = devm_kzalloc(dev, sizeof(*drv), GFP_KERNEL);
>>>> + if (!drv)
>>>> + return -ENOMEM;
>>>> +
>>>> + drv->dev = dev;
>>>> + drv->desc = desc;
>>>> + drv->threads = devm_kcalloc(dev, desc->num_threads,
>>>> + sizeof(*drv->threads), GFP_KERNEL);
>>>> + if (!drv->threads)
>>>> + return -ENOMEM;
>>>> +
>>>> + drv->cell_data.num_domains = desc->num_threads;
>>>> + drv->cell_data.domains = devm_kcalloc(drv->dev,
>>>> + drv->cell_data.num_domains,
>>>> + sizeof(*drv->cell_data.domains),
>>>> + GFP_KERNEL);
>>>> + if (!drv->cell_data.domains)
>>>> + return -ENOMEM;
>>>> +
>>>> + if (data->acc_desc)
>>>> + drv->acc_desc = data->acc_desc;
>>>> +
>>>> + mutex_init(&drv->lock);
>>>> +
>>>> + if (desc->cpr_type < CTRL_TYPE_CPRH) {
>>>> + np = of_parse_phandle(dev->of_node, "acc-syscon", 0);
>>>> + if (!np)
>>>> + return -ENODEV;
>>>> +
>>>> + drv->tcsr = syscon_node_to_regmap(np);
>>>> + of_node_put(np);
>>>> + if (IS_ERR(drv->tcsr))
>>>> + return PTR_ERR(drv->tcsr);
>>>> + }
>>>> +
>>>> + ret = cpr3_resources_init(pdev, drv);
>>>> + if (ret)
>>>> + return ret;
>>>> +
>>>> + drv->irq = platform_get_irq_optional(pdev, 0);
>>>> + if (desc->cpr_type != CTRL_TYPE_CPRH && drv->irq < 0)
>>>> + return -EINVAL;
>>>> +
>>>> + /* On CPRhardened, vreg access it not allowed */
>>>> + drv->vreg = devm_regulator_get_optional(dev, "vdd");
>>>> + if (desc->cpr_type != CTRL_TYPE_CPRH && IS_ERR(drv->vreg))
>>>> + return PTR_ERR(drv->vreg);
>>>> +
>>>> + /*
>>>> + * On at least CPRhardened, vreg is unaccessible and there is no
>>>> + * way to read linear step from that regulator, hence it is hardcoded
>>>> + * in the driver;
>>>> + * When the vreg_step is not declared in the cpr data (or is zero),
>>>> + * then having access to the vreg regulator is mandatory, as this
>>>> + * will be retrieved through the regulator API.
>>>> + */
>>>> + if (desc->vreg_step_fixed)
>>>> + drv->vreg_step = desc->vreg_step_fixed;
>>>> + else
>>>> + drv->vreg_step = regulator_get_linear_step(drv->vreg);
>>>> +
>>>> + if (!drv->vreg_step)
>>>> + return -EINVAL;
>>>> +
>>>> + /*
>>>> + * Initialize fuse corners, since it simply depends
>>>> + * on data in efuses.
>>>> + * Everything related to (virtual) corners has to be
>>>> + * initialized after attaching to the power domain,
>>>> + * since it depends on the CPU's OPP table.
>>>> + */
>>>> + ret = nvmem_cell_read_variable_le_u32(dev, "cpr_fuse_revision", &drv->fusing_rev);
>>>> + if (ret)
>>>> + return ret;
>>>> +
>>>> + ret = nvmem_cell_read_variable_le_u32(dev, "cpr_speed_bin", &drv->speed_bin);
>>>> + if (ret)
>>>> + return ret;
>>>> +
>>>> + /*
>>>> + * Some SoCs require extra corners for MEM-ACC or APM: if
>>>> + * the related parameters have been specified, then reserve
>>>> + * a corner for the APM and/or MEM-ACC crossover, used by
>>>> + * OSM and CPRh HW to set the supply voltage during the APM
>>>> + * and/or MEM-ACC switch routine.
>>>> + */
>>>> + if (desc->cpr_type == CTRL_TYPE_CPRH) {
>>>> + if (desc->apm_crossover && desc->apm_hysteresis >= 0)
>>>> + drv->extra_corners++;
>>>> +
>>>> + if (desc->mem_acc_threshold)
>>>> + drv->extra_corners++;
>>>> + }
>>>> +
>>>> + /* Initialize all threads */
>>>> + for (i = 0; i < desc->num_threads; i++) {
>>>> + ret = cpr_thread_init(drv, i);
>>>> + if (ret)
>>>> + return ret;
>>>> + }
>>>> +
>>>> + /* Initialize global parameters */
>>>> + ret = cpr3_init_parameters(drv);
>>>> + if (ret)
>>>> + return ret;
>>>> +
>>>> + /* Write initial configuration on all threads */
>>>> + for (i = 0; i < desc->num_threads; i++) {
>>>> + ret = cpr_configure(&drv->threads[i]);
>>>> + if (ret)
>>>> + return ret;
>>>> + }
>>>> +
>>>> + ret = of_genpd_add_provider_onecell(dev->of_node, &drv->cell_data);
>>>> + if (ret)
>>>> + return ret;
>>>> +
>>>> + platform_set_drvdata(pdev, drv);
>>>> + cpr3_debugfs_init(drv);
>>>> +
>>>> + return 0;
>>>> +}
>>>> +
>>>> +static int cpr_remove(struct platform_device *pdev)
>>>> +{
>>>> + struct cpr_drv *drv = platform_get_drvdata(pdev);
>>>> + int i;
>>>> +
>>>> + of_genpd_del_provider(pdev->dev.of_node);
>>>> +
>>>> + for (i = 0; i < drv->desc->num_threads; i++) {
>>>> + cpr_ctl_disable(&drv->threads[i]);
>>>> + cpr_irq_set(&drv->threads[i], 0);
>>>> + pm_genpd_remove(&drv->threads[i].pd);
>>>> + }
>>>> +
>>>> + debugfs_remove_recursive(drv->debugfs);
>>>> +
>>>> + return 0;
>>>> +}
>>>> +
>>>> +static const struct of_device_id cpr3_match_table[] = {
>>>> + { .compatible = "qcom,msm8998-cprh", .data = &msm8998_cpr_acc_desc },
>>>> + { .compatible = "qcom,sdm630-cprh", .data = &sdm630_cpr_acc_desc },
>>>> + { }
>>>> +};
>>>> +MODULE_DEVICE_TABLE(of, cpr3_match_table);
>>>> +
>>>> +static struct platform_driver cpr3_driver = {
>>>> + .probe = cpr_probe,
>>>> + .remove = cpr_remove,
>>>> + .driver = {
>>>> + .name = "qcom-cpr3",
>>>> + .of_match_table = cpr3_match_table,
>>>> + },
>>>> +};
>>>> +module_platform_driver(cpr3_driver)
>>>> +
>>>> +MODULE_DESCRIPTION("Core Power Reduction (CPR) v3/v4 driver");
>>>> +MODULE_LICENSE("GPL v2");
>>>> \ No newline at end of file
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