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Date: Wed, 20 Jun 2018 14:18:59 +0530
From: sricharan@...eaurora.org
To: Craig Tatlor <ctatlor97@...il.com>
Cc: robh@...nel.org, viresh.kumar@...aro.org, mark.rutland@....com,
mturquette@...libre.com, sboyd@...eaurora.org,
linux@...linux.org.uk, andy.gross@...aro.org,
david.brown@...aro.org, rjw@...ysocki.net,
linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
linux-pm@...r.kernel.org, linux@....linux.org.uk,
thierry.escande@...aro.org, linux-arm-msm-owner@...r.kernel.org,
bjorn.andersson@...aro.org
Subject: Re: [PATCH v10 13/14] cpufreq: Add module to register cpufreq on
Krait CPUs
On 2018-06-19 20:59, Craig Tatlor wrote:
> The pvs refuse check is incorrect... With downstream it says it isn't
> blown and that it is 11, which also happens on upstream if I import
> it's
> efuse reading code from an older revision, or comment out the check.
>
ok, atleast on my ipq8064, it works the same. let me check once.
> Also, I'm still getting my issue about clocks above 2,147,483,647hz
> however I think this may be related to the division in the hfpll driver
> so I'll have a debug around there.
>
hmm, atleast on ipq8064, it goes till the max frequency. As you said
it might be to do with the hfpll driver that runs on 8974. I will try
to test
on that hardware.
That said, just realized that i missed a minor comment from Bjorn.
Will anyway update it.
Regards,
Sricharan
> On Tue, Jun 19, 2018 at 07:15:24PM +0530, Sricharan R wrote:
>> From: Stephen Boyd <sboyd@...eaurora.org>
>>
>> Register a cpufreq-generic device whenever we detect that a
>> "qcom,krait" compatible CPU is present in DT.
>>
>> Acked-by: Viresh Kumar <viresh.kumar@...aro.org>
>> [Sricharan: updated to use dev_pm_opp_set_prop_name and
>> nvmem apis]
>> Signed-off-by: Sricharan R <sricharan@...eaurora.org>
>> [Thierry Escande: update to add support for opp-supported-hw]
>> Signed-off-by: Thierry Escande <thierry.escande@...aro.org>
>> Signed-off-by: Stephen Boyd <sboyd@...eaurora.org>
>> Acked-by: Viresh Kumar <viresh.kumar@...aro.org>
>> ---
>> [v10] updated to add support for opp-supported-hw given by
>> Thierry Escande <thierry.escande@...aro.org>
>>
>> drivers/cpufreq/Kconfig.arm | 10 ++
>> drivers/cpufreq/Makefile | 1 +
>> drivers/cpufreq/cpufreq-dt-platdev.c | 5 +
>> drivers/cpufreq/qcom-cpufreq.c | 201
>> +++++++++++++++++++++++++++++++++++
>> 4 files changed, 217 insertions(+)
>> create mode 100644 drivers/cpufreq/qcom-cpufreq.c
>>
>> diff --git a/drivers/cpufreq/Kconfig.arm b/drivers/cpufreq/Kconfig.arm
>> index 7f56fe5..87e5d8d 100644
>> --- a/drivers/cpufreq/Kconfig.arm
>> +++ b/drivers/cpufreq/Kconfig.arm
>> @@ -134,6 +134,16 @@ config ARM_OMAP2PLUS_CPUFREQ
>> depends on ARCH_OMAP2PLUS
>> default ARCH_OMAP2PLUS
>>
>> +config ARM_QCOM_CPUFREQ
>> + bool "CPUfreq driver for the QCOM SoCs with KRAIT processors"
>> + depends on ARCH_QCOM
>> + select PM_OPP
>> + help
>> + This enables the CPUFreq driver for Qualcomm SoCs with
>> + KRAIT processors.
>> +
>> + If in doubt, say N.
>> +
>> config ARM_S3C_CPUFREQ
>> bool
>> help
>> diff --git a/drivers/cpufreq/Makefile b/drivers/cpufreq/Makefile
>> index 8d24ade..c591e1e 100644
>> --- a/drivers/cpufreq/Makefile
>> +++ b/drivers/cpufreq/Makefile
>> @@ -65,6 +65,7 @@ obj-$(CONFIG_MACH_MVEBU_V7) += mvebu-cpufreq.o
>> obj-$(CONFIG_ARM_OMAP2PLUS_CPUFREQ) += omap-cpufreq.o
>> obj-$(CONFIG_ARM_PXA2xx_CPUFREQ) += pxa2xx-cpufreq.o
>> obj-$(CONFIG_PXA3xx) += pxa3xx-cpufreq.o
>> +obj-$(CONFIG_ARM_QCOM_CPUFREQ) += qcom-cpufreq.o
>> obj-$(CONFIG_ARM_S3C2410_CPUFREQ) += s3c2410-cpufreq.o
>> obj-$(CONFIG_ARM_S3C2412_CPUFREQ) += s3c2412-cpufreq.o
>> obj-$(CONFIG_ARM_S3C2416_CPUFREQ) += s3c2416-cpufreq.o
>> diff --git a/drivers/cpufreq/cpufreq-dt-platdev.c
>> b/drivers/cpufreq/cpufreq-dt-platdev.c
>> index 3b585e4..e2e9a99 100644
>> --- a/drivers/cpufreq/cpufreq-dt-platdev.c
>> +++ b/drivers/cpufreq/cpufreq-dt-platdev.c
>> @@ -127,6 +127,11 @@
>> { .compatible = "ti,am43", },
>> { .compatible = "ti,dra7", },
>>
>> + { .compatible = "qcom,ipq8064", },
>> + { .compatible = "qcom,apq8064", },
>> + { .compatible = "qcom,msm8974", },
>> + { .compatible = "qcom,msm8960", },
>> +
>> { }
>> };
>>
>> diff --git a/drivers/cpufreq/qcom-cpufreq.c
>> b/drivers/cpufreq/qcom-cpufreq.c
>> new file mode 100644
>> index 0000000..1d4ab54
>> --- /dev/null
>> +++ b/drivers/cpufreq/qcom-cpufreq.c
>> @@ -0,0 +1,201 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +// Copyright (c) 2018, The Linux Foundation. All rights reserved.
>> +
>> +#include <linux/cpu.h>
>> +#include <linux/module.h>
>> +#include <linux/nvmem-consumer.h>
>> +#include <linux/of.h>
>> +#include <linux/platform_device.h>
>> +#include <linux/pm_opp.h>
>> +#include <linux/slab.h>
>> +
>> +static void __init get_krait_bin_format_a(int *speed, int *pvs, int
>> *pvs_ver,
>> + struct nvmem_cell *pvs_nvmem, u8 *buf)
>> +{
>> + u32 pte_efuse;
>> +
>> + pte_efuse = *((u32 *)buf);
>> +
>> + *speed = pte_efuse & 0xf;
>> + if (*speed == 0xf)
>> + *speed = (pte_efuse >> 4) & 0xf;
>> +
>> + if (*speed == 0xf) {
>> + *speed = 0;
>> + pr_warn("Speed bin: Defaulting to %d\n", *speed);
>> + } else {
>> + pr_info("Speed bin: %d\n", *speed);
>> + }
>> +
>> + *pvs = (pte_efuse >> 10) & 0x7;
>> + if (*pvs == 0x7)
>> + *pvs = (pte_efuse >> 13) & 0x7;
>> +
>> + if (*pvs == 0x7) {
>> + *pvs = 0;
>> + pr_warn("PVS bin: Defaulting to %d\n", *pvs);
>> + } else {
>> + pr_info("PVS bin: %d\n", *pvs);
>> + }
>> +
>> + kfree(buf);
>> +}
>> +
>> +static void __init get_krait_bin_format_b(int *speed, int *pvs, int
>> *pvs_ver,
>> + struct nvmem_cell *pvs_nvmem, u8 *buf)
>> +{
>> + u32 pte_efuse, redundant_sel;
>> +
>> + pte_efuse = *((u32 *)buf);
>> + redundant_sel = (pte_efuse >> 24) & 0x7;
>> + *speed = pte_efuse & 0x7;
>> +
>> + /* 4 bits of PVS are in efuse register bits 31, 8-6. */
>> + *pvs = ((pte_efuse >> 28) & 0x8) | ((pte_efuse >> 6) & 0x7);
>> + *pvs_ver = (pte_efuse >> 4) & 0x3;
>> +
>> + switch (redundant_sel) {
>> + case 1:
>> + *speed = (pte_efuse >> 27) & 0xf;
>> + break;
>> + case 2:
>> + *pvs = (pte_efuse >> 27) & 0xf;
>> + break;
>> + }
>> +
>> + /* Check SPEED_BIN_BLOW_STATUS */
>> + if (pte_efuse & BIT(3)) {
>> + pr_info("Speed bin: %d\n", *speed);
>> + } else {
>> + pr_warn("Speed bin not set. Defaulting to 0!\n");
>> + *speed = 0;
>> + }
>> +
>> + /* Check PVS_BLOW_STATUS */
>> + pte_efuse = *(((u32 *)buf) + 4);
>> + if (pte_efuse) {
>> + pr_info("PVS bin: %d\n", *pvs);
>> + } else {
>> + pr_warn("PVS bin not set. Defaulting to 0!\n");
>> + *pvs = 0;
>> + }
>> +
>> + pr_info("PVS version: %d\n", *pvs_ver);
>> + kfree(buf);
>> +}
>> +
>> +static int __init qcom_cpufreq_populate_opps(struct nvmem_cell
>> *pvs_nvmem,
>> + struct opp_table **tbl1,
>> + struct opp_table **tbl2)
>> +{
>> + int speed = 0, pvs = 0, pvs_ver = 0, cpu, ret;
>> + struct device *cpu_dev;
>> + u8 *buf;
>> + size_t len;
>> + char pvs_name[] = "speedXX-pvsXX-vXX";
>> + u32 hw_version;
>> +
>> + buf = nvmem_cell_read(pvs_nvmem, &len);
>> + if (len == 4)
>> + get_krait_bin_format_a(&speed, &pvs, &pvs_ver, pvs_nvmem, buf);
>> + else if (len == 8)
>> + get_krait_bin_format_b(&speed, &pvs, &pvs_ver, pvs_nvmem, buf);
>> + else
>> + pr_warn("Unable to read nvmem data. Defaulting to 0!\n");
>> +
>> + snprintf(pvs_name, sizeof(pvs_name), "speed%d-pvs%d-v%d",
>> + speed, pvs, pvs_ver);
>> +
>> + hw_version = (1 << speed);
>> +
>> + for (cpu = 0; cpu < num_possible_cpus(); cpu++) {
>> + cpu_dev = get_cpu_device(cpu);
>> + if (!cpu_dev)
>> + return -ENODEV;
>> +
>> + tbl1[cpu] = dev_pm_opp_set_prop_name(cpu_dev, pvs_name);
>> + if (IS_ERR(tbl1[cpu])) {
>> + ret = PTR_ERR(tbl1[cpu]);
>> + tbl1[cpu] = 0;
>> + pr_warn("failed to add OPP name %s\n", pvs_name);
>> + return ret;
>> + }
>> +
>> + tbl2[cpu] = dev_pm_opp_set_supported_hw(cpu_dev, &hw_version,
>> + 1);
>> + if (IS_ERR(tbl2[cpu])) {
>> + ret = PTR_ERR(tbl2[cpu]);
>> + tbl2[cpu] = 0;
>> + pr_warn("failed to set supported hw version\n");
>> + return ret;
>> + }
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static int __init qcom_cpufreq_driver_init(void)
>> +{
>> + struct platform_device *pdev;
>> + struct device *cpu_dev;
>> + struct device_node *np;
>> + struct nvmem_cell *pvs_nvmem;
>> + struct opp_table *tbl1[NR_CPUS] = { NULL }, *tbl2[NR_CPUS] = { NULL
>> };
>> + int ret, cpu = 0;
>> +
>> + cpu_dev = get_cpu_device(0);
>> + if (!cpu_dev)
>> + return -ENODEV;
>> +
>> + np = dev_pm_opp_of_get_opp_desc_node(cpu_dev);
>> + if (!np)
>> + return -ENOENT;
>> +
>> + if (!of_device_is_compatible(np, "operating-points-v2-krait-cpu")) {
>> + ret = -ENOENT;
>> + goto free_np;
>> + }
>> +
>> + pvs_nvmem = of_nvmem_cell_get(np, NULL);
>> + if (IS_ERR(pvs_nvmem)) {
>> + dev_err(cpu_dev, "Could not get nvmem cell\n");
>> + ret = PTR_ERR(pvs_nvmem);
>> + goto free_np;
>> + }
>> +
>> + ret = qcom_cpufreq_populate_opps(pvs_nvmem, tbl1, tbl2);
>> + if (ret)
>> + goto free_opp_name;
>> +
>> + pdev = platform_device_register_simple("cpufreq-dt", -1, NULL, 0);
>> + if (IS_ERR(pdev)) {
>> + ret = PTR_ERR(pdev);
>> + goto free_opp_name;
>> + }
>> +
>> + of_node_put(np);
>> +
>> + return 0;
>> +
>> +free_opp_name:
>> + while (tbl1[cpu]) {
>> + dev_pm_opp_put_prop_name(tbl1[cpu]);
>> + cpu++;
>> + }
>> +
>> + cpu = 0;
>> + while (tbl2[cpu]) {
>> + dev_pm_opp_put_supported_hw(tbl2[cpu]);
>> + cpu++;
>> + }
>> +
>> +free_np:
>> + of_node_put(np);
>> +
>> + return ret;
>> +}
>> +late_initcall(qcom_cpufreq_driver_init);
>> +
>> +MODULE_DESCRIPTION("Qualcomm CPUfreq driver");
>> +MODULE_AUTHOR("Stephen Boyd <sboyd@...eaurora.org>");
>> +MODULE_LICENSE("GPL v2");
>> --
>> 1.9.1
>>
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