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Date: Fri, 15 Dec 2017 14:46:00 +0100
From: Hans Verkuil <hverkuil@...all.nl>
To: Jose Abreu <Jose.Abreu@...opsys.com>, linux-media@...r.kernel.org,
linux-kernel@...r.kernel.org
Cc: Joao Pinto <Joao.Pinto@...opsys.com>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Hans Verkuil <hans.verkuil@...co.com>,
Sylwester Nawrocki <snawrocki@...nel.org>,
Philippe Ombredanne <pombredanne@...b.com>
Subject: Re: [PATCH v10 3/4] [media] platform: Add Synopsys DesignWare HDMI RX
PHY e405 Driver
On 11/12/17 18:41, Jose Abreu wrote:
> This adds support for the Synopsys DesignWare HDMI RX PHY e405. This
> phy receives and decodes HDMI video that is delivered to a controller.
>
> Main features included in this driver are:
> - Equalizer algorithm that chooses the phy best settings
> according to the detected HDMI cable characteristics.
> - Support for scrambling
> - Support for HDMI 2.0 modes up to 6G (HDMI 4k@...z).
>
> The driver was implemented as a standalone V4L2 subdevice and the
> phy interface with the controller was implemented using V4L2 ioctls. I
> do not know if this is the best option but it is not possible to use the
> existing API functions directly as we need specific functions that will
> be called by the controller at specific configuration stages.
>
> There is also a bidirectional communication between controller and phy:
> The phy must provide functions that the controller will call (i.e.
> configuration functions) and the controller must provide read/write
> callbacks, as well as other specific functions.
>
> Signed-off-by: Jose Abreu <joabreu@...opsys.com>
> Cc: Joao Pinto <jpinto@...opsys.com>
> Cc: Mauro Carvalho Chehab <mchehab@...nel.org>
> Cc: Hans Verkuil <hans.verkuil@...co.com>
> Cc: Sylwester Nawrocki <snawrocki@...nel.org>
> Cc: Philippe Ombredanne <pombredanne@...b.com>
Reviewed-by: Hans Verkuil <hans.verkuil@...co.com>
Regards,
Hans
> ---
> Changes from v9:
> - Use SPDX License ID (Philippe)
> Changes from v4:
> - Use usleep_range (Sylwester)
> - Remove some comments (Sylwester)
> - Parse phy version from of_device_id (Sylwester)
> - Use "cfg" instead of "cfg-clk" (Sylwester, Rob)
> - Change some messages to dev_dbg (Sylwester)
> Changes from v3:
> - Use v4l2 async API (Sylwester)
> - Use clock API (Sylwester)
> - Add compatible string (Sylwester)
> Changes from RFC:
> - Remove a bunch of functions that can be collapsed into
> a single config() function
> - Add comments for the callbacks and structures (Hans)
> ---
> drivers/media/platform/Kconfig | 2 +
> drivers/media/platform/Makefile | 2 +
> drivers/media/platform/dwc/Kconfig | 8 +
> drivers/media/platform/dwc/Makefile | 1 +
> drivers/media/platform/dwc/dw-hdmi-phy-e405.c | 822 ++++++++++++++++++++++++++
> drivers/media/platform/dwc/dw-hdmi-phy-e405.h | 41 ++
> include/media/dwc/dw-hdmi-phy-pdata.h | 106 ++++
> 7 files changed, 982 insertions(+)
> create mode 100644 drivers/media/platform/dwc/Kconfig
> create mode 100644 drivers/media/platform/dwc/Makefile
> create mode 100644 drivers/media/platform/dwc/dw-hdmi-phy-e405.c
> create mode 100644 drivers/media/platform/dwc/dw-hdmi-phy-e405.h
> create mode 100644 include/media/dwc/dw-hdmi-phy-pdata.h
>
> diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig
> index fd0c998..0187cbd 100644
> --- a/drivers/media/platform/Kconfig
> +++ b/drivers/media/platform/Kconfig
> @@ -33,6 +33,8 @@ source "drivers/media/platform/omap/Kconfig"
>
> source "drivers/media/platform/blackfin/Kconfig"
>
> +source "drivers/media/platform/dwc/Kconfig"
> +
> config VIDEO_SH_VOU
> tristate "SuperH VOU video output driver"
> depends on MEDIA_CAMERA_SUPPORT
> diff --git a/drivers/media/platform/Makefile b/drivers/media/platform/Makefile
> index 003b0bb..2e879c6 100644
> --- a/drivers/media/platform/Makefile
> +++ b/drivers/media/platform/Makefile
> @@ -97,3 +97,5 @@ obj-$(CONFIG_VIDEO_QCOM_CAMSS) += qcom/camss-8x16/
> obj-$(CONFIG_VIDEO_QCOM_VENUS) += qcom/venus/
>
> obj-y += meson/
> +
> +obj-y += dwc/
> diff --git a/drivers/media/platform/dwc/Kconfig b/drivers/media/platform/dwc/Kconfig
> new file mode 100644
> index 0000000..361d38d
> --- /dev/null
> +++ b/drivers/media/platform/dwc/Kconfig
> @@ -0,0 +1,8 @@
> +config VIDEO_DWC_HDMI_PHY_E405
> + tristate "Synopsys Designware HDMI RX PHY e405 driver"
> + depends on VIDEO_V4L2 && VIDEO_V4L2_SUBDEV_API
> + help
> + Support for Synopsys Designware HDMI RX PHY. Version is e405.
> +
> + To compile this driver as a module, choose M here. The module
> + will be called dw-hdmi-phy-e405.
> diff --git a/drivers/media/platform/dwc/Makefile b/drivers/media/platform/dwc/Makefile
> new file mode 100644
> index 0000000..fc3b62c
> --- /dev/null
> +++ b/drivers/media/platform/dwc/Makefile
> @@ -0,0 +1 @@
> +obj-$(CONFIG_VIDEO_DWC_HDMI_PHY_E405) += dw-hdmi-phy-e405.o
> diff --git a/drivers/media/platform/dwc/dw-hdmi-phy-e405.c b/drivers/media/platform/dwc/dw-hdmi-phy-e405.c
> new file mode 100644
> index 0000000..e781cc1
> --- /dev/null
> +++ b/drivers/media/platform/dwc/dw-hdmi-phy-e405.c
> @@ -0,0 +1,822 @@
> +// SPDX-License-Identifier: (GPL-2.0 OR MIT)
> +// Copyright (c) 2017 Synopsys, Inc. and/or its affiliates.
> +// Synopsys DesignWare HDMI PHY e405 driver
> +
> +#include <linux/clk.h>
> +#include <linux/delay.h>
> +#include <linux/module.h>
> +#include <linux/of_device.h>
> +#include <linux/platform_device.h>
> +#include <linux/types.h>
> +#include <media/v4l2-async.h>
> +#include <media/v4l2-subdev.h>
> +#include <media/dwc/dw-hdmi-phy-pdata.h>
> +#include "dw-hdmi-phy-e405.h"
> +
> +MODULE_AUTHOR("Jose Abreu <joabreu@...opsys.com>");
> +MODULE_DESCRIPTION("Designware HDMI PHY e405 driver");
> +MODULE_LICENSE("Dual MIT/GPL");
> +
> +#define PHY_EQ_WAIT_TIME_START 3
> +#define PHY_EQ_SLEEP_TIME_CDR 30
> +#define PHY_EQ_SLEEP_TIME_ACQ 1
> +#define PHY_EQ_BOUNDSPREAD 20
> +#define PHY_EQ_MIN_ACQ_STABLE 3
> +#define PHY_EQ_ACC_LIMIT 360
> +#define PHY_EQ_ACC_MIN_LIMIT 0
> +#define PHY_EQ_MAX_SETTING 13
> +#define PHY_EQ_SHORT_CABLE_SETTING 4
> +#define PHY_EQ_ERROR_CABLE_SETTING 4
> +#define PHY_EQ_MIN_SLOPE 50
> +#define PHY_EQ_AVG_ACQ 5
> +#define PHY_EQ_MINMAX_NTRIES 3
> +#define PHY_EQ_EQUALIZED_COUNTER_VAL 512
> +#define PHY_EQ_EQUALIZED_COUNTER_VAL_HDMI20 512
> +#define PHY_EQ_MINMAX_MAXDIFF 4
> +#define PHY_EQ_MINMAX_MAXDIFF_HDMI20 2
> +#define PHY_EQ_FATBIT_MASK 0x0000
> +#define PHY_EQ_FATBIT_MASK_4K 0x0c03
> +#define PHY_EQ_FATBIT_MASK_HDMI20 0x0e03
> +
> +struct dw_phy_eq_ch {
> + u16 best_long_setting;
> + u8 valid_long_setting;
> + u16 best_short_setting;
> + u8 valid_short_setting;
> + u16 best_setting;
> + u16 acc;
> + u16 acq;
> + u16 last_acq;
> + u16 upper_bound_acq;
> + u16 lower_bound_acq;
> + u16 out_bound_acq;
> + u16 read_acq;
> +};
> +
> +static const struct dw_phy_mpll_config {
> + u16 addr;
> + u16 val;
> +} dw_phy_e405_mpll_cfg[] = {
> + { 0x27, 0x1B94 },
> + { 0x28, 0x16D2 },
> + { 0x29, 0x12D9 },
> + { 0x2A, 0x3249 },
> + { 0x2B, 0x3653 },
> + { 0x2C, 0x3436 },
> + { 0x2D, 0x124D },
> + { 0x2E, 0x0001 },
> + { 0xCE, 0x0505 },
> + { 0xCF, 0x0505 },
> + { 0xD0, 0x0000 },
> + { 0x00, 0x0000 },
> +};
> +
> +struct dw_phy_dev {
> + struct device *dev;
> + struct dw_phy_pdata *config;
> + unsigned int version;
> + struct clk *clk;
> + u16 cfg_clk;
> + bool phy_enabled;
> + struct v4l2_subdev sd;
> + u16 mpll_status;
> + unsigned char color_depth;
> + bool hdmi2;
> + bool scrambling;
> + struct mutex lock;
> +};
> +
> +static inline struct dw_phy_dev *to_dw_dev(struct v4l2_subdev *sd)
> +{
> + return container_of(sd, struct dw_phy_dev, sd);
> +}
> +
> +static void phy_write(struct dw_phy_dev *dw_dev, u16 val, u16 addr)
> +{
> + void *arg = dw_dev->config->funcs_arg;
> +
> + dw_dev->config->funcs->write(arg, val, addr);
> +}
> +
> +static u16 phy_read(struct dw_phy_dev *dw_dev, u16 addr)
> +{
> + void *arg = dw_dev->config->funcs_arg;
> +
> + return dw_dev->config->funcs->read(arg, addr);
> +}
> +
> +static void phy_reset(struct dw_phy_dev *dw_dev, int enable)
> +{
> + void *arg = dw_dev->config->funcs_arg;
> +
> + dw_dev->config->funcs->reset(arg, enable);
> +}
> +
> +static void phy_pddq(struct dw_phy_dev *dw_dev, int enable)
> +{
> + void *arg = dw_dev->config->funcs_arg;
> +
> + dw_dev->config->funcs->pddq(arg, enable);
> +}
> +
> +static void phy_svsmode(struct dw_phy_dev *dw_dev, int enable)
> +{
> + void *arg = dw_dev->config->funcs_arg;
> +
> + dw_dev->config->funcs->svsmode(arg, enable);
> +}
> +
> +static void phy_zcal_reset(struct dw_phy_dev *dw_dev)
> +{
> + void *arg = dw_dev->config->funcs_arg;
> +
> + dw_dev->config->funcs->zcal_reset(arg);
> +}
> +
> +static bool phy_zcal_done(struct dw_phy_dev *dw_dev)
> +{
> + void *arg = dw_dev->config->funcs_arg;
> +
> + return dw_dev->config->funcs->zcal_done(arg);
> +}
> +
> +static bool phy_tmds_valid(struct dw_phy_dev *dw_dev)
> +{
> + void *arg = dw_dev->config->funcs_arg;
> +
> + return dw_dev->config->funcs->tmds_valid(arg);
> +}
> +
> +static int dw_phy_eq_test(struct dw_phy_dev *dw_dev,
> + u16 *fat_bit_mask, int *min_max_length)
> +{
> + u16 main_fsm_status, val;
> + int i;
> +
> + for (i = 0; i < PHY_EQ_WAIT_TIME_START; i++) {
> + main_fsm_status = phy_read(dw_dev, PHY_MAINFSM_STATUS1);
> + if (main_fsm_status & 0x100)
> + break;
> + mdelay(PHY_EQ_SLEEP_TIME_CDR);
> + }
> +
> + if (i == PHY_EQ_WAIT_TIME_START) {
> + dev_dbg(dw_dev->dev, "phy start conditions not achieved\n");
> + return -ETIMEDOUT;
> + }
> +
> + if (main_fsm_status & 0x400) {
> + dev_dbg(dw_dev->dev, "invalid pll rate\n");
> + return -EINVAL;
> + }
> +
> + val = (phy_read(dw_dev, PHY_CDR_CTRL_CNT) & 0x300) >> 8;
> + if (val == 0x1) {
> + /* HDMI 2.0 */
> + *fat_bit_mask = PHY_EQ_FATBIT_MASK_HDMI20;
> + *min_max_length = PHY_EQ_MINMAX_MAXDIFF_HDMI20;
> + dev_dbg(dw_dev->dev, "[EQUALIZER] using HDMI 2.0 values\n");
> + } else if (!(main_fsm_status & 0x600)) {
> + /* HDMI 1.4 (pll rate = 0) */
> + *fat_bit_mask = PHY_EQ_FATBIT_MASK_4K;
> + *min_max_length = PHY_EQ_MINMAX_MAXDIFF;
> + dev_dbg(dw_dev->dev, "[EQUALIZER] using HDMI 1.4@4k values\n");
> + } else {
> + /* HDMI 1.4 */
> + *fat_bit_mask = PHY_EQ_FATBIT_MASK;
> + *min_max_length = PHY_EQ_MINMAX_MAXDIFF;
> + dev_dbg(dw_dev->dev, "[EQUALIZER] using HDMI 1.4 values\n");
> + }
> +
> + return 0;
> +}
> +
> +static void dw_phy_eq_default(struct dw_phy_dev *dw_dev)
> +{
> + phy_write(dw_dev, 0x08A8, PHY_CH0_EQ_CTRL1);
> + phy_write(dw_dev, 0x0020, PHY_CH0_EQ_CTRL2);
> + phy_write(dw_dev, 0x08A8, PHY_CH1_EQ_CTRL1);
> + phy_write(dw_dev, 0x0020, PHY_CH1_EQ_CTRL2);
> + phy_write(dw_dev, 0x08A8, PHY_CH2_EQ_CTRL1);
> + phy_write(dw_dev, 0x0020, PHY_CH2_EQ_CTRL2);
> +}
> +
> +static void dw_phy_eq_single(struct dw_phy_dev *dw_dev)
> +{
> + phy_write(dw_dev, 0x0211, PHY_CH0_EQ_CTRL1);
> + phy_write(dw_dev, 0x0211, PHY_CH1_EQ_CTRL1);
> + phy_write(dw_dev, 0x0211, PHY_CH2_EQ_CTRL1);
> +}
> +
> +static void dw_phy_eq_equal_setting(struct dw_phy_dev *dw_dev,
> + u16 lock_vector)
> +{
> + phy_write(dw_dev, lock_vector, PHY_CH0_EQ_CTRL4);
> + phy_write(dw_dev, 0x0024, PHY_CH0_EQ_CTRL2);
> + phy_write(dw_dev, 0x0026, PHY_CH0_EQ_CTRL2);
> + phy_read(dw_dev, PHY_CH0_EQ_STATUS2);
> + phy_write(dw_dev, lock_vector, PHY_CH1_EQ_CTRL4);
> + phy_write(dw_dev, 0x0024, PHY_CH1_EQ_CTRL2);
> + phy_write(dw_dev, 0x0026, PHY_CH1_EQ_CTRL2);
> + phy_read(dw_dev, PHY_CH1_EQ_STATUS2);
> + phy_write(dw_dev, lock_vector, PHY_CH2_EQ_CTRL4);
> + phy_write(dw_dev, 0x0024, PHY_CH2_EQ_CTRL2);
> + phy_write(dw_dev, 0x0026, PHY_CH2_EQ_CTRL2);
> + phy_read(dw_dev, PHY_CH2_EQ_STATUS2);
> +}
> +
> +static void dw_phy_eq_equal_setting_ch0(struct dw_phy_dev *dw_dev,
> + u16 lock_vector)
> +{
> + phy_write(dw_dev, lock_vector, PHY_CH0_EQ_CTRL4);
> + phy_write(dw_dev, 0x0024, PHY_CH0_EQ_CTRL2);
> + phy_write(dw_dev, 0x0026, PHY_CH0_EQ_CTRL2);
> + phy_read(dw_dev, PHY_CH0_EQ_STATUS2);
> +}
> +
> +static void dw_phy_eq_equal_setting_ch1(struct dw_phy_dev *dw_dev,
> + u16 lock_vector)
> +{
> + phy_write(dw_dev, lock_vector, PHY_CH1_EQ_CTRL4);
> + phy_write(dw_dev, 0x0024, PHY_CH1_EQ_CTRL2);
> + phy_write(dw_dev, 0x0026, PHY_CH1_EQ_CTRL2);
> + phy_read(dw_dev, PHY_CH1_EQ_STATUS2);
> +}
> +
> +static void dw_phy_eq_equal_setting_ch2(struct dw_phy_dev *dw_dev,
> + u16 lock_vector)
> +{
> + phy_write(dw_dev, lock_vector, PHY_CH2_EQ_CTRL4);
> + phy_write(dw_dev, 0x0024, PHY_CH2_EQ_CTRL2);
> + phy_write(dw_dev, 0x0026, PHY_CH2_EQ_CTRL2);
> + phy_read(dw_dev, PHY_CH2_EQ_STATUS2);
> +}
> +
> +static void dw_phy_eq_auto_calib(struct dw_phy_dev *dw_dev)
> +{
> + phy_write(dw_dev, 0x1809, PHY_MAINFSM_CTRL);
> + phy_write(dw_dev, 0x1819, PHY_MAINFSM_CTRL);
> + phy_write(dw_dev, 0x1809, PHY_MAINFSM_CTRL);
> +}
> +
> +static void dw_phy_eq_init_vars(struct dw_phy_eq_ch *ch)
> +{
> + ch->acc = 0;
> + ch->acq = 0;
> + ch->last_acq = 0;
> + ch->valid_long_setting = 0;
> + ch->valid_short_setting = 0;
> + ch->best_setting = PHY_EQ_SHORT_CABLE_SETTING;
> +}
> +
> +static bool dw_phy_eq_acquire_early_cnt(struct dw_phy_dev *dw_dev,
> + u16 setting, u16 acq, struct dw_phy_eq_ch *ch0,
> + struct dw_phy_eq_ch *ch1, struct dw_phy_eq_ch *ch2)
> +{
> + u16 lock_vector = 0x1;
> + int i;
> +
> + lock_vector <<= setting;
> + ch0->out_bound_acq = 0;
> + ch1->out_bound_acq = 0;
> + ch2->out_bound_acq = 0;
> + ch0->acq = 0;
> + ch1->acq = 0;
> + ch2->acq = 0;
> +
> + dw_phy_eq_equal_setting(dw_dev, lock_vector);
> + dw_phy_eq_auto_calib(dw_dev);
> +
> + mdelay(PHY_EQ_SLEEP_TIME_CDR);
> + if (!phy_tmds_valid(dw_dev))
> + dev_dbg(dw_dev->dev, "TMDS is NOT valid\n");
> +
> + ch0->read_acq = phy_read(dw_dev, PHY_CH0_EQ_STATUS3);
> + ch1->read_acq = phy_read(dw_dev, PHY_CH1_EQ_STATUS3);
> + ch2->read_acq = phy_read(dw_dev, PHY_CH2_EQ_STATUS3);
> +
> + ch0->acq += ch0->read_acq;
> + ch1->acq += ch1->read_acq;
> + ch2->acq += ch2->read_acq;
> +
> + ch0->upper_bound_acq = ch0->read_acq + PHY_EQ_BOUNDSPREAD;
> + ch0->lower_bound_acq = ch0->read_acq - PHY_EQ_BOUNDSPREAD;
> + ch1->upper_bound_acq = ch1->read_acq + PHY_EQ_BOUNDSPREAD;
> + ch1->lower_bound_acq = ch1->read_acq - PHY_EQ_BOUNDSPREAD;
> + ch2->upper_bound_acq = ch2->read_acq + PHY_EQ_BOUNDSPREAD;
> + ch2->lower_bound_acq = ch2->read_acq - PHY_EQ_BOUNDSPREAD;
> +
> + for (i = 1; i < acq; i++) {
> + dw_phy_eq_auto_calib(dw_dev);
> + mdelay(PHY_EQ_SLEEP_TIME_ACQ);
> +
> + if ((ch0->read_acq > ch0->upper_bound_acq) ||
> + (ch0->read_acq < ch0->lower_bound_acq))
> + ch0->out_bound_acq++;
> + if ((ch1->read_acq > ch1->upper_bound_acq) ||
> + (ch1->read_acq < ch1->lower_bound_acq))
> + ch1->out_bound_acq++;
> + if ((ch2->read_acq > ch2->upper_bound_acq) ||
> + (ch2->read_acq < ch1->lower_bound_acq))
> + ch2->out_bound_acq++;
> +
> + if (i == PHY_EQ_MIN_ACQ_STABLE) {
> + if ((ch0->out_bound_acq == 0) &&
> + (ch1->out_bound_acq == 0) &&
> + (ch2->out_bound_acq == 0)) {
> + acq = 3;
> + break;
> + }
> + }
> +
> + ch0->read_acq = phy_read(dw_dev, PHY_CH0_EQ_STATUS3);
> + ch1->read_acq = phy_read(dw_dev, PHY_CH1_EQ_STATUS3);
> + ch2->read_acq = phy_read(dw_dev, PHY_CH2_EQ_STATUS3);
> +
> + ch0->acq += ch0->read_acq;
> + ch1->acq += ch1->read_acq;
> + ch2->acq += ch2->read_acq;
> + }
> +
> + ch0->acq = ch0->acq / acq;
> + ch1->acq = ch1->acq / acq;
> + ch2->acq = ch2->acq / acq;
> +
> + return true;
> +}
> +
> +static int dw_phy_eq_test_type(u16 setting, bool tmds_valid,
> + struct dw_phy_eq_ch *ch)
> +{
> + u16 step_slope = 0;
> +
> + if ((ch->acq < ch->last_acq) && tmds_valid) {
> + /* Long cable equalization */
> + ch->acc += ch->last_acq - ch->acq;
> + if ((ch->valid_long_setting == 0) && (ch->acq < 512) &&
> + (ch->acc > 0)) {
> + ch->best_long_setting = setting;
> + ch->valid_long_setting = 1;
> + }
> + step_slope = ch->last_acq - ch->acq;
> + }
> +
> + if (tmds_valid && (ch->valid_short_setting == 0)) {
> + /* Short cable equalization */
> + if ((setting < PHY_EQ_SHORT_CABLE_SETTING) &&
> + (ch->acq < PHY_EQ_EQUALIZED_COUNTER_VAL)) {
> + ch->best_short_setting= setting;
> + ch->valid_short_setting = 1;
> + }
> +
> + if (setting == PHY_EQ_SHORT_CABLE_SETTING) {
> + ch->best_short_setting = PHY_EQ_SHORT_CABLE_SETTING;
> + ch->valid_short_setting = 1;
> + }
> + }
> +
> + if (ch->valid_long_setting && (ch->acc > PHY_EQ_ACC_LIMIT)) {
> + ch->best_setting = ch->best_long_setting;
> + return 1;
> + }
> +
> + if ((setting == PHY_EQ_MAX_SETTING) && (ch->acc < PHY_EQ_ACC_LIMIT) &&
> + ch->valid_short_setting) {
> + ch->best_setting = ch->best_short_setting;
> + return 2;
> + }
> +
> + if ((setting == PHY_EQ_MAX_SETTING) && tmds_valid &&
> + (ch->acc > PHY_EQ_ACC_LIMIT) &&
> + (step_slope > PHY_EQ_MIN_SLOPE)) {
> + ch->best_setting = PHY_EQ_MAX_SETTING;
> + return 3;
> + }
> +
> + if (setting == PHY_EQ_MAX_SETTING) {
> + ch->best_setting = PHY_EQ_ERROR_CABLE_SETTING;
> + return 255;
> + }
> +
> + return 0;
> +}
> +
> +static bool dw_phy_eq_setting_finder(struct dw_phy_dev *dw_dev, u16 acq,
> + struct dw_phy_eq_ch *ch0, struct dw_phy_eq_ch *ch1,
> + struct dw_phy_eq_ch *ch2)
> +{
> + u16 act = 0;
> + int ret_ch0 = 0, ret_ch1 = 0, ret_ch2 = 0;
> + bool tmds_valid = false;
> +
> + dw_phy_eq_init_vars(ch0);
> + dw_phy_eq_init_vars(ch1);
> + dw_phy_eq_init_vars(ch2);
> +
> + tmds_valid = dw_phy_eq_acquire_early_cnt(dw_dev, act, acq,
> + ch0, ch1, ch2);
> +
> + while ((ret_ch0 == 0) || (ret_ch1 == 0) || (ret_ch2 == 0)) {
> + act++;
> +
> + ch0->last_acq = ch0->acq;
> + ch1->last_acq = ch1->acq;
> + ch2->last_acq = ch2->acq;
> +
> + tmds_valid = dw_phy_eq_acquire_early_cnt(dw_dev, act, acq,
> + ch0, ch1, ch2);
> +
> + if (!ret_ch0)
> + ret_ch0 = dw_phy_eq_test_type(act, tmds_valid, ch0);
> + if (!ret_ch1)
> + ret_ch1 = dw_phy_eq_test_type(act, tmds_valid, ch1);
> + if (!ret_ch2)
> + ret_ch2 = dw_phy_eq_test_type(act, tmds_valid, ch2);
> + }
> +
> + if ((ret_ch0 == 255) || (ret_ch1 == 255) || (ret_ch2 == 255))
> + return false;
> + return true;
> +}
> +
> +static bool dw_phy_eq_maxvsmin(u16 ch0_setting, u16 ch1_setting,
> + u16 ch2_setting, u16 min_max_length)
> +{
> + u16 min = ch0_setting, max = ch0_setting;
> +
> + if (ch1_setting > max)
> + max = ch1_setting;
> + if (ch2_setting > max)
> + max = ch2_setting;
> + if (ch1_setting < min)
> + min = ch1_setting;
> + if (ch2_setting < min)
> + min = ch2_setting;
> +
> + if ((max - min) > min_max_length)
> + return false;
> + return true;
> +}
> +
> +static int dw_phy_eq_init(struct dw_phy_dev *dw_dev, u16 acq, bool force)
> +{
> + struct dw_phy_eq_ch ch0, ch1, ch2;
> + u16 fat_bit_mask, lock_vector = 0x1;
> + int min_max_length, i, ret = 0;
> + u16 mpll_status;
> +
> + if (dw_dev->version < 401)
> + return ret;
> + if (!dw_dev->phy_enabled)
> + return -EINVAL;
> +
> + mpll_status = phy_read(dw_dev, PHY_CLK_MPLL_STATUS);
> + if (mpll_status == dw_dev->mpll_status && !force)
> + return ret;
> + dw_dev->mpll_status = mpll_status;
> +
> + phy_write(dw_dev, 0x00, PHY_MAINFSM_OVR2);
> + phy_write(dw_dev, 0x00, PHY_CH0_EQ_CTRL3);
> + phy_write(dw_dev, 0x00, PHY_CH1_EQ_CTRL3);
> + phy_write(dw_dev, 0x00, PHY_CH2_EQ_CTRL3);
> +
> + ret = dw_phy_eq_test(dw_dev, &fat_bit_mask, &min_max_length);
> + if (ret) {
> + if (ret == -EINVAL) /* Means equalizer is not needed */
> + ret = 0;
> +
> + /* Do not change values if we don't have clock */
> + if (ret != -ETIMEDOUT) {
> + dw_phy_eq_default(dw_dev);
> + phy_pddq(dw_dev, 1);
> + phy_pddq(dw_dev, 0);
> + }
> + } else {
> + dw_phy_eq_single(dw_dev);
> + dw_phy_eq_equal_setting(dw_dev, 0x0001);
> + phy_write(dw_dev, fat_bit_mask, PHY_CH0_EQ_CTRL6);
> + phy_write(dw_dev, fat_bit_mask, PHY_CH1_EQ_CTRL6);
> + phy_write(dw_dev, fat_bit_mask, PHY_CH2_EQ_CTRL6);
> +
> + for (i = 0; i < PHY_EQ_MINMAX_NTRIES; i++) {
> + if (dw_phy_eq_setting_finder(dw_dev, acq,
> + &ch0, &ch1, &ch2)) {
> + if (dw_phy_eq_maxvsmin(ch0.best_setting,
> + ch1.best_setting,
> + ch2.best_setting,
> + min_max_length))
> + break;
> + }
> +
> + ch0.best_setting = PHY_EQ_ERROR_CABLE_SETTING;
> + ch1.best_setting = PHY_EQ_ERROR_CABLE_SETTING;
> + ch2.best_setting = PHY_EQ_ERROR_CABLE_SETTING;
> + }
> +
> + dev_dbg(dw_dev->dev, "equalizer settings: "
> + "ch0=0x%x, ch1=0x%x, ch1=0x%x\n",
> + ch0.best_setting, ch1.best_setting,
> + ch2.best_setting);
> +
> + if (i == PHY_EQ_MINMAX_NTRIES)
> + ret = -EINVAL;
> +
> + lock_vector = 0x1;
> + lock_vector <<= ch0.best_setting;
> + dw_phy_eq_equal_setting_ch0(dw_dev, lock_vector);
> +
> + lock_vector = 0x1;
> + lock_vector <<= ch1.best_setting;
> + dw_phy_eq_equal_setting_ch1(dw_dev, lock_vector);
> +
> + lock_vector = 0x1;
> + lock_vector <<= ch2.best_setting;
> + dw_phy_eq_equal_setting_ch2(dw_dev, lock_vector);
> +
> + phy_pddq(dw_dev, 1);
> + phy_pddq(dw_dev, 0);
> + }
> +
> + return ret;
> +}
> +
> +static int dw_phy_config(struct dw_phy_dev *dw_dev, unsigned char color_depth,
> + bool hdmi2, bool scrambling)
> +{
> + const struct dw_phy_mpll_config *mpll_cfg = dw_phy_e405_mpll_cfg;
> + struct device *dev = dw_dev->dev;
> + int timeout = 100;
> + u16 val, res_idx;
> + bool zcal_done;
> +
> + dev_dbg(dev, "%s: color_depth=%d, hdmi2=%d, scrambling=%d, cfg_clk=%d\n",
> + __func__, color_depth, hdmi2, scrambling, dw_dev->cfg_clk);
> +
> + switch (color_depth) {
> + case 8:
> + res_idx = 0x0;
> + break;
> + case 10:
> + res_idx = 0x1;
> + break;
> + case 12:
> + res_idx = 0x2;
> + break;
> + case 16:
> + res_idx = 0x3;
> + break;
> + default:
> + return -EINVAL;
> + }
> +
> + phy_reset(dw_dev, 1);
> + phy_pddq(dw_dev, 1);
> + phy_svsmode(dw_dev, 1);
> +
> + phy_zcal_reset(dw_dev);
> + do {
> + usleep_range(1000, 1100);
> + zcal_done = phy_zcal_done(dw_dev);
> + } while (!zcal_done && timeout--);
> +
> + if (!zcal_done) {
> + dev_err(dw_dev->dev, "Zcal calibration failed\n");
> + return -ETIMEDOUT;
> + }
> +
> + phy_reset(dw_dev, 0);
> +
> + /* CMU */
> + val = (0x08 << 10) | (0x01 << 9);
> + val |= (dw_dev->cfg_clk * 4) & GENMASK(8, 0);
> + phy_write(dw_dev, val, PHY_CMU_CONFIG);
> +
> + /* Color Depth and enable fast switching */
> + val = phy_read(dw_dev, PHY_SYSTEM_CONFIG);
> + val = (val & ~0x60) | (res_idx << 5) | BIT(11);
> + phy_write(dw_dev, val, PHY_SYSTEM_CONFIG);
> +
> + /* MPLL */
> + for (; mpll_cfg->addr != 0x0; mpll_cfg++)
> + phy_write(dw_dev, mpll_cfg->val, mpll_cfg->addr);
> +
> + /* Operation for data rates between 3.4Gbps and 6Gbps */
> + val = phy_read(dw_dev, PHY_CDR_CTRL_CNT);
> + if (hdmi2)
> + val |= BIT(8);
> + else
> + val &= ~BIT(8);
> + phy_write(dw_dev, val, PHY_CDR_CTRL_CNT);
> +
> + /* Scrambling */
> + val = phy_read(dw_dev, PHY_OVL_PROT_CTRL);
> + if (scrambling)
> + val |= GENMASK(7,6);
> + else
> + val &= ~GENMASK(7,6);
> + phy_write(dw_dev, val, PHY_OVL_PROT_CTRL);
> +
> + /* Enable phy */
> + phy_pddq(dw_dev, 0);
> +
> + dw_dev->color_depth = color_depth;
> + dw_dev->hdmi2 = hdmi2;
> + dw_dev->scrambling = scrambling;
> + return 0;
> +}
> +
> +static int dw_phy_enable(struct dw_phy_dev *dw_dev, unsigned char color_depth,
> + bool hdmi2, bool scrambling)
> +{
> + int ret;
> +
> + if (dw_dev->phy_enabled &&
> + dw_dev->color_depth == color_depth &&
> + dw_dev->hdmi2 == hdmi2 &&
> + dw_dev->scrambling == scrambling)
> + return 0;
> +
> + ret = dw_phy_config(dw_dev, color_depth, hdmi2, scrambling);
> + if (ret)
> + return ret;
> +
> + phy_reset(dw_dev, 0);
> + phy_pddq(dw_dev, 0);
> + dw_dev->phy_enabled = true;
> + return 0;
> +}
> +
> +static void dw_phy_disable(struct dw_phy_dev *dw_dev)
> +{
> + if (!dw_dev->phy_enabled)
> + return;
> +
> + phy_reset(dw_dev, 1);
> + phy_pddq(dw_dev, 1);
> + phy_svsmode(dw_dev, 0);
> + dw_dev->mpll_status = 0xFFFF;
> + dw_dev->phy_enabled = false;
> +}
> +
> +static long dw_phy_ioctl(struct v4l2_subdev *sd, unsigned int cmd, void *arg)
> +{
> + struct dw_phy_dev *dw_dev = to_dw_dev(sd);
> + struct dw_phy_config_command *ccmd;
> + struct dw_phy_eq_command *ecmd;
> + int ret = 0;
> +
> + dev_dbg(dw_dev->dev, "%s: cmd=%d\n", __func__, cmd);
> +
> + mutex_lock(&dw_dev->lock);
> + switch (cmd) {
> + case DW_PHY_IOCTL_EQ_INIT:
> + ecmd = (struct dw_phy_eq_command *)arg;
> + ecmd->result = dw_phy_eq_init(dw_dev, ecmd->nacq, ecmd->force);
> + break;
> + case DW_PHY_IOCTL_CONFIG:
> + ccmd = (struct dw_phy_config_command *)arg;
> + ccmd->result = dw_phy_enable(dw_dev, ccmd->color_depth,
> + ccmd->hdmi2, ccmd->scrambling);
> + break;
> + default:
> + ret = -ENOIOCTLCMD;
> + break;
> + }
> + mutex_unlock(&dw_dev->lock);
> +
> + return ret;
> +}
> +
> +static int dw_phy_s_power(struct v4l2_subdev *sd, int on)
> +{
> + struct dw_phy_dev *dw_dev = to_dw_dev(sd);
> +
> + dev_dbg(dw_dev->dev, "%s: on=%d\n", __func__, on);
> +
> + mutex_lock(&dw_dev->lock);
> + if (!on)
> + dw_phy_disable(dw_dev);
> + mutex_unlock(&dw_dev->lock);
> + return 0;
> +}
> +
> +static const struct v4l2_subdev_core_ops dw_phy_core_ops = {
> + .ioctl = dw_phy_ioctl,
> + .s_power = dw_phy_s_power,
> +};
> +
> +static const struct v4l2_subdev_ops dw_phy_sd_ops = {
> + .core = &dw_phy_core_ops,
> +};
> +
> +struct dw_hdmi_phy_data {
> + const char *name;
> + unsigned int version;
> +};
> +
> +static const struct dw_hdmi_phy_data dw_phy_e405_data = {
> + .name = "e405",
> + .version = 405,
> +};
> +
> +static int dw_phy_probe(struct platform_device *pdev)
> +{
> + struct dw_phy_pdata *pdata = pdev->dev.platform_data;
> + const struct dw_hdmi_phy_data *of_data;
> + struct device *dev = &pdev->dev;
> + struct dw_phy_dev *dw_dev;
> + struct v4l2_subdev *sd;
> + int ret;
> +
> + dev_dbg(dev, "probe start\n");
> +
> + dw_dev = devm_kzalloc(dev, sizeof(*dw_dev), GFP_KERNEL);
> + if (!dw_dev)
> + return -ENOMEM;
> +
> + if (!pdata) {
> + dev_err(dev, "no platform data suplied\n");
> + return -EINVAL;
> + }
> +
> + of_data = of_device_get_match_data(dev);
> + if (!of_data) {
> + dev_err(dev, "no valid phy configuration available\n");
> + return -EINVAL;
> + }
> +
> + dw_dev->dev = dev;
> + dw_dev->config = pdata;
> + dw_dev->version = of_data->version;
> + mutex_init(&dw_dev->lock);
> +
> + dw_dev->clk = devm_clk_get(dev, "cfg");
> + if (IS_ERR(dw_dev->clk)) {
> + dev_err(dev, "failed to get cfg clock\n");
> + return PTR_ERR(dw_dev->clk);
> + }
> +
> + ret = clk_prepare_enable(dw_dev->clk);
> + if (ret) {
> + dev_err(dev, "failed to enable cfg clock\n");
> + return ret;
> + }
> +
> + dw_dev->cfg_clk = clk_get_rate(dw_dev->clk) / 1000000U;
> + if (!dw_dev->cfg_clk) {
> + dev_err(dev, "invalid cfg clock frequency\n");
> + ret = -EINVAL;
> + goto err_clk;
> + }
> +
> + /* V4L2 initialization */
> + sd = &dw_dev->sd;
> + v4l2_subdev_init(sd, &dw_phy_sd_ops);
> + strlcpy(sd->name, dev_name(dev), sizeof(sd->name));
> + sd->dev = dev;
> +
> + /* Force phy disabling */
> + dw_dev->phy_enabled = true;
> + dw_phy_disable(dw_dev);
> +
> + ret = v4l2_async_register_subdev(sd);
> + if (ret) {
> + dev_err(dev, "failed to register subdev\n");
> + goto err_clk;
> + }
> +
> + dev_set_drvdata(dev, sd);
> + dev_dbg(dev, "driver probed (name=%s, cfg clock=%d)\n",
> + of_data->name, dw_dev->cfg_clk);
> + return 0;
> +
> +err_clk:
> + clk_disable_unprepare(dw_dev->clk);
> + return ret;
> +}
> +
> +static int dw_phy_remove(struct platform_device *pdev)
> +{
> + struct v4l2_subdev *sd = dev_get_drvdata(&pdev->dev);
> + struct dw_phy_dev *dw_dev = to_dw_dev(sd);
> +
> + v4l2_async_unregister_subdev(sd);
> + clk_disable_unprepare(dw_dev->clk);
> + return 0;
> +}
> +
> +static const struct of_device_id dw_hdmi_phy_e405_id[] = {
> + { .compatible = "snps,dw-hdmi-phy-e405", .data = &dw_phy_e405_data, },
> + { },
> +};
> +MODULE_DEVICE_TABLE(of, dw_hdmi_phy_e405_id);
> +
> +static struct platform_driver dw_phy_e405_driver = {
> + .probe = dw_phy_probe,
> + .remove = dw_phy_remove,
> + .driver = {
> + .name = DW_PHY_E405_DRVNAME,
> + .of_match_table = dw_hdmi_phy_e405_id,
> + }
> +};
> +module_platform_driver(dw_phy_e405_driver);
> diff --git a/drivers/media/platform/dwc/dw-hdmi-phy-e405.h b/drivers/media/platform/dwc/dw-hdmi-phy-e405.h
> new file mode 100644
> index 0000000..dcb71f0
> --- /dev/null
> +++ b/drivers/media/platform/dwc/dw-hdmi-phy-e405.h
> @@ -0,0 +1,41 @@
> +// SPDX-License-Identifier: (GPL-2.0 OR MIT)
> +// Copyright (c) 2017 Synopsys, Inc. and/or its affiliates.
> +// Synopsys DesignWare HDMI PHY e405 driver
> +
> +#ifndef __DW_HDMI_PHY_E405_H__
> +#define __DW_HDMI_PHY_E405_H__
> +
> +#define PHY_CMU_CONFIG 0x02
> +#define PHY_SYSTEM_CONFIG 0x03
> +#define PHY_MAINFSM_CTRL 0x05
> +#define PHY_MAINFSM_OVR2 0x08
> +#define PHY_MAINFSM_STATUS1 0x09
> +#define PHY_OVL_PROT_CTRL 0x0D
> +#define PHY_CDR_CTRL_CNT 0x0E
> +#define PHY_CLK_MPLL_STATUS 0x2F
> +#define PHY_CH0_EQ_CTRL1 0x32
> +#define PHY_CH0_EQ_CTRL2 0x33
> +#define PHY_CH0_EQ_STATUS 0x34
> +#define PHY_CH0_EQ_CTRL3 0x3E
> +#define PHY_CH0_EQ_CTRL4 0x3F
> +#define PHY_CH0_EQ_STATUS2 0x40
> +#define PHY_CH0_EQ_STATUS3 0x42
> +#define PHY_CH0_EQ_CTRL6 0x43
> +#define PHY_CH1_EQ_CTRL1 0x52
> +#define PHY_CH1_EQ_CTRL2 0x53
> +#define PHY_CH1_EQ_STATUS 0x54
> +#define PHY_CH1_EQ_CTRL3 0x5E
> +#define PHY_CH1_EQ_CTRL4 0x5F
> +#define PHY_CH1_EQ_STATUS2 0x60
> +#define PHY_CH1_EQ_STATUS3 0x62
> +#define PHY_CH1_EQ_CTRL6 0x63
> +#define PHY_CH2_EQ_CTRL1 0x72
> +#define PHY_CH2_EQ_CTRL2 0x73
> +#define PHY_CH2_EQ_STATUS 0x74
> +#define PHY_CH2_EQ_CTRL3 0x7E
> +#define PHY_CH2_EQ_CTRL4 0x7F
> +#define PHY_CH2_EQ_STATUS2 0x80
> +#define PHY_CH2_EQ_STATUS3 0x82
> +#define PHY_CH2_EQ_CTRL6 0x83
> +
> +#endif /* __DW_HDMI_PHY_E405_H__ */
> diff --git a/include/media/dwc/dw-hdmi-phy-pdata.h b/include/media/dwc/dw-hdmi-phy-pdata.h
> new file mode 100644
> index 0000000..04196ba
> --- /dev/null
> +++ b/include/media/dwc/dw-hdmi-phy-pdata.h
> @@ -0,0 +1,106 @@
> +// SPDX-License-Identifier: (GPL-2.0 OR MIT)
> +// Copyright (c) 2017 Synopsys, Inc. and/or its affiliates.
> +// Synopsys DesignWare HDMI PHY platform data
> +
> +#ifndef __DW_HDMI_PHY_PDATA_H__
> +#define __DW_HDMI_PHY_PDATA_H__
> +
> +#define DW_PHY_E405_DRVNAME "dw-hdmi-phy-e405"
> +
> +#define DW_PHY_IOCTL_EQ_INIT _IOW('R',1,int)
> +#define DW_PHY_IOCTL_CONFIG _IOW('R',2,int)
> +
> +/**
> + * struct dw_phy_eq_command - Command arguments for HDMI PHY equalizer
> + * algorithm.
> + *
> + * @nacq: Number of acquisitions to get.
> + *
> + * @force: Force equalizer algorithm even if the MPLL status didn't change
> + * from previous run.
> + *
> + * @result: Result from the equalizer algorithm. Shall be zero if equalizer
> + * ran with success or didn't run because the video mode does not need
> + * equalizer (for low clock values).
> + */
> +struct dw_phy_eq_command {
> + u16 nacq;
> + bool force;
> + int result;
> +};
> +
> +/**
> + * struct dw_phy_config_command - Command arguments for HDMI PHY configuration
> + * function.
> + *
> + * @color_depth: Color depth of the video mode being received.
> + *
> + * @hdmi2: Must be set to true if the video mode being received has a data
> + * rate above 3.4Gbps (generally HDMI 2.0 video modes, like 4k@...z).
> + *
> + * @scrambling: Must be set to true if scrambling is currently enabled.
> + * Scrambling is enabled by source when SCDC scrambling_en field is set to 1.
> + *
> + * @result: Result from the configuration function. Shall be zero if phy was
> + * configured with success.
> + */
> +struct dw_phy_config_command {
> + unsigned char color_depth;
> + bool hdmi2;
> + bool scrambling;
> + int result;
> +};
> +
> +/**
> + * struct dw_phy_funcs - Set of callbacks used to communicate between phy
> + * and hdmi controller. Controller must correctly fill these callbacks
> + * before probbing the phy driver.
> + *
> + * @write: write callback. Write value 'val' into address 'addr' of phy.
> + *
> + * @read: read callback. Read address 'addr' and return the value.
> + *
> + * @reset: reset callback. Activate phy reset. Active high.
> + *
> + * @pddq: pddq callback. Activate phy configuration mode. Active high.
> + *
> + * @svsmode: svsmode callback. Activate phy retention mode. Active low.
> + *
> + * @zcal_reset: zcal reset callback. Restart the impedance calibration
> + * procedure. Active high. This is only used in prototyping and not in real
> + * ASIC. Callback shall be empty (but non NULL) in ASIC cases.
> + *
> + * @zcal_done: zcal done callback. Return the current status of impedance
> + * calibration procedure. This is only used in prototyping and not in real
> + * ASIC. Shall return always true in ASIC cases.
> + *
> + * @tmds_valid: TMDS valid callback. Return the current status of TMDS signal
> + * that comes from phy and feeds controller. This is read from a controller
> + * register.
> + */
> +struct dw_phy_funcs {
> + void (*write) (void *arg, u16 val, u16 addr);
> + u16 (*read) (void *arg, u16 addr);
> + void (*reset) (void *arg, int enable);
> + void (*pddq) (void *arg, int enable);
> + void (*svsmode) (void *arg, int enable);
> + void (*zcal_reset) (void *arg);
> + bool (*zcal_done) (void *arg);
> + bool (*tmds_valid) (void *arg);
> +};
> +
> +/**
> + * struct dw_phy_pdata - Platform data definition for Synopsys HDMI PHY.
> + *
> + * @funcs: set of callbacks that must be correctly filled and supplied to phy.
> + * See @dw_phy_funcs.
> + *
> + * @funcs_arg: parameter that is supplied to callbacks along with the function
> + * parameters.
> + */
> +struct dw_phy_pdata {
> + const struct dw_phy_funcs *funcs;
> + void *funcs_arg;
> +};
> +
> +#endif /* __DW_HDMI_PHY_PDATA_H__ */
>
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