Re: [PATCH v6 1/2] drm/panel: Add support for Truly NT35597 panel driver

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Hi Abhinav,

I have a few comments below.

On Fri, 2018-08-17 at 19:06 -0700, Abhinav Kumar wrote:
> From: "abhinavk@xxxxxxxxxxxxxx" <abhinavk@xxxxxxxxxxxxxx>
> 
> Add support for Truly NT35597 panel driver used
> in MSM reference platforms.
> 
> This panel driver supports both single DSI and dual DSI
> modes.
> 
> However, this patch series adds support only for
> dual DSI mode.
> 
> Changes in v6:
> - Introduce panel config to store panel specific
>   details
> - Bring back the size member for the panel command
>   structure to make the design more scalable
> - Move the display mode from the DT to driver
> - Change the compatible string to indicate which
>   which board and panel it will be used for
> - Rename the functions to match the panel driver
> - Have a data member for each compatible string
> - Remove the panel commands split as its not
>   required for the panel init functionality
> 
> Signed-off-by: Archit Taneja <architt@xxxxxxxxxxxxxx>
> Signed-off-by: Abhinav Kumar <abhinavk@xxxxxxxxxxxxxx>
> ---
>  drivers/gpu/drm/panel/Kconfig               |   8 +
>  drivers/gpu/drm/panel/Makefile              |   1 +
>  drivers/gpu/drm/panel/panel-truly-nt35597.c | 705 ++++++++++++++++++++++++++++
>  3 files changed, 714 insertions(+)
>  create mode 100644 drivers/gpu/drm/panel/panel-truly-nt35597.c
> 
> diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
> index 6020c30..7ae74c2 100644
> --- a/drivers/gpu/drm/panel/Kconfig
> +++ b/drivers/gpu/drm/panel/Kconfig
> @@ -186,4 +186,12 @@ config DRM_PANEL_SITRONIX_ST7789V
>  	  Say Y here if you want to enable support for the Sitronix
>  	  ST7789V controller for 240x320 LCD panels
>  
> +config DRM_PANEL_TRULY_NT35597_WQXGA
> +	tristate "Truly WQXGA"
> +	depends on OF
> +	depends on DRM_MIPI_DSI
> +	select VIDEOMODE_HELPERS
> +	help
> +	  Say Y here if you want to enable support for Truly NT35597 WQXGA Dual DSI
> +	  Video Mode panel
>  endmenu
> diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
> index 5ccaaa9..80fd19f 100644
> --- a/drivers/gpu/drm/panel/Makefile
> +++ b/drivers/gpu/drm/panel/Makefile
> @@ -19,3 +19,4 @@ obj-$(CONFIG_DRM_PANEL_SEIKO_43WVF1G) += panel-seiko-43wvf1g.o
>  obj-$(CONFIG_DRM_PANEL_SHARP_LQ101R1SX01) += panel-sharp-lq101r1sx01.o
>  obj-$(CONFIG_DRM_PANEL_SHARP_LS043T1LE01) += panel-sharp-ls043t1le01.o
>  obj-$(CONFIG_DRM_PANEL_SITRONIX_ST7789V) += panel-sitronix-st7789v.o
> +obj-$(CONFIG_DRM_PANEL_TRULY_NT35597_WQXGA) += panel-truly-nt35597.o
> diff --git a/drivers/gpu/drm/panel/panel-truly-nt35597.c b/drivers/gpu/drm/panel/panel-truly-nt35597.c
> new file mode 100644
> index 0000000..691be03
> --- /dev/null
> +++ b/drivers/gpu/drm/panel/panel-truly-nt35597.c
> @@ -0,0 +1,705 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2018, The Linux Foundation. All rights reserved.
> + */
> +
> +#include <linux/gpio/consumer.h>
> +#include <linux/of_graph.h>
> +#include <linux/regulator/consumer.h>
> +#include <linux/pinctrl/consumer.h>
> +#include <linux/of_device.h>
> +
> +#include <video/mipi_display.h>
> +#include <video/of_videomode.h>
> +#include <video/videomode.h>
> +
> +#include <drm/drmP.h>
> +#include <drm/drm_panel.h>
> +#include <drm/drm_mipi_dsi.h>
> +
> +static const char * const regulator_names[] = {
> +	"vdda",
> +	"vdispp",
> +	"vdispn",
> +};
> +
> +static unsigned long const regulator_enable_loads[] = {
> +	62000,
> +	100000,
> +	100000,
> +};
> +
> +static unsigned long const regulator_disable_loads[] = {
> +	80,
> +	100,
> +	100,
> +};
> +
> +struct nt35597_config {
> +	u32 width_mm;
> +	u32 height_mm;
> +	char panel_name[256];

Why not
	const char *panel_name;
?

> +	void *panel_on_cmds;

	const void *panel_on_cmds;

> +	u32 num_on_cmds;
> +	struct drm_display_mode *dm;

	const struct drm_display_mode *dm;

> +};
> +
> +struct truly_nt35597 {
> +	struct device *dev;
> +	struct drm_panel panel;
> +
> +	struct regulator_bulk_data supplies[ARRAY_SIZE(regulator_names)];
> +
> +	struct gpio_desc *reset_gpio;
> +	struct gpio_desc *mode_gpio;
> +
> +	struct backlight_device *backlight;
> +
> +	struct mipi_dsi_device *dsi[2];
> +
> +	const struct nt35597_config *config;
> +	bool prepared;
> +	bool enabled;
> +};
> +
> +static inline struct truly_nt35597 *panel_to_ctx(struct drm_panel *panel)
> +{
> +	return container_of(panel, struct truly_nt35597, panel);
> +}
> +
> +#define MAX_LEN	5
> +#define SHORT_PACKET 2
> +#define LONG_PACKET 4
> +
> +struct cmd_set {
> +	u8 commands[MAX_LEN];
> +	int size;

Consider changing this to
	u8 size;

> +};
> +
> +static struct cmd_set qcom_2k_panel_magic_cmds[] = {
> +	/* CMD2_P0 */
[...]
> +	/* VBP+VSA=,VFP = 10H */
> +	{ { 0x3B, 0x03, 0x0A, 0x0A }, 4 },
> +	/* FTE on */
> +	{ { 0x35, 0x00 }, 2 },
> +	/* EN_BK =1(auto black) */
> +	{ { 0xE5, 0x01 }, 2 },
> +	/* CMD mode(10) VDO mode(03) */
> +	{ { 0xBB, 0x03 }, 2 },
> +	/* Non Reload MTP */
> +	{ { 0xFB, 0x01 }, 2 },
> +};
> +
> +static int truly_dcs_write(struct drm_panel *panel, u32 command)
> +{
> +	struct truly_nt35597 *ctx = panel_to_ctx(panel);
> +	int i, ret;
> +
> +	for (i = 0; i < ARRAY_SIZE(ctx->dsi); i++) {
> +		ret = mipi_dsi_dcs_write(ctx->dsi[i],
> +			command, NULL, 0);
> +		if (ret < 0) {
> +			DRM_DEV_ERROR(ctx->dev,
> +				"set_display_off cmd failed for dsi = %d\n",

This error message is not accurate.
truly_dcs_write is also called from truly_nt35597_prepare.

> +			i);
> +		}
> +	}
> +
> +	return ret;
> +}
> +
> +static int truly_dcs_write_buf(struct drm_panel *panel,
> +	u32 size, u8 *buf)
> +{
> +	struct truly_nt35597 *ctx = panel_to_ctx(panel);
> +	int ret = 0;
> +	int i;
> +
> +	for (i = 0; i < ARRAY_SIZE(ctx->dsi); i++) {
> +		ret = mipi_dsi_dcs_write_buffer(ctx->dsi[i],
> +			buf,
> +			size);
> +
> +		if (ret < 0) {
> +			DRM_DEV_ERROR(ctx->dev,
> +				"failed to tx cmd [%d], err: %d\n",
> +				i, ret);
> +			return ret;
> +		}
> +	}
> +
> +	return ret;
> +}
> +
> +#define truly_call_write_func(ret, func, panel, command) {\
> +	ret = func(panel, command);     \
> +}
> +
> +#define truly_write_buf_func(ret, func, panel, size, buf) {\
> +	ret = func(panel, size, buf); \
> +}

These macros just obfuscate things. Just call the function directly
below.

> +
> +static int truly_35597_power_on(struct truly_nt35597 *ctx)
> +{
> +	int ret, i;
> +
> +	for (i = 0; i < ARRAY_SIZE(ctx->supplies); i++) {
> +		ret = regulator_set_load(ctx->supplies[i].consumer,
> +					regulator_enable_loads[i]);
> +		if (ret)
> +			return ret;
> +	}
> +
> +	ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
> +	if (ret < 0)
> +		return ret;
> +
> +	/* Reset sequence of truly panel requires
> +	 * the reset pin to be pulled high for 10ms
> +	 * followed by a low period of 10ms and then
> +	 * pulled high again
> +	 */

The comment says 10 ms

> +	gpiod_set_value(ctx->reset_gpio, 1);
> +	msleep(20);

but then the sleep is for 20 ms.
Maybe use
	usleep_range(10000, 20000);
?

> +	gpiod_set_value(ctx->reset_gpio, 0);
> +	msleep(20);
> +	gpiod_set_value(ctx->reset_gpio, 1);

So this is an active low reset?
Should this maybe use GPIO_ACTIVE_LOW in the DT and then

	gpiod_set_value(ctx->reset_gpio, 0);
	gpiod_set_value(ctx->reset_gpio, 1);
	gpiod_set_value(ctx->reset_gpio, 0);

here?

> +
> +	return 0;
> +}
> +
> +static int truly_nt35597_power_off(struct truly_nt35597 *ctx)
> +{
> +	int ret, i;
> +
> +	gpiod_set_value(ctx->reset_gpio, 0);
> +
> +	for (i = 0; i < ARRAY_SIZE(ctx->supplies); i++) {
> +		ret = regulator_set_load(ctx->supplies[i].consumer,
> +				regulator_disable_loads[i]);
> +		if (ret)
> +			return ret;
> +	}
> +
> +	return regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
> +}
> +
> +static int truly_nt35597_disable(struct drm_panel *panel)
> +{
> +	struct truly_nt35597 *ctx = panel_to_ctx(panel);
> +	int ret;
> +
> +	if (!ctx->enabled)
> +		return 0;
> +
> +	if (ctx->backlight) {
> +		ret = backlight_disable(ctx->backlight);
> +		if (ret < 0)
> +			DRM_DEV_ERROR(ctx->dev, "backlight disable failed %d\n",
> +				ret);
> +	}
> +
> +	ctx->enabled = false;
> +	return 0;
> +}
> +
> +static int truly_nt35597_unprepare(struct drm_panel *panel)
> +{
> +	struct truly_nt35597 *ctx = panel_to_ctx(panel);
> +	int ret = 0;
> +
> +	if (!ctx->prepared)
> +		return 0;
> +
> +	ctx->dsi[0]->mode_flags = 0;
> +	ctx->dsi[1]->mode_flags = 0;
> +
> +	truly_call_write_func(ret, truly_dcs_write, panel,
> +		MIPI_DCS_SET_DISPLAY_OFF);

See above, just

	ret = truly_dcs_write(panel, MIPI_DCS_SET_DISPLAY_OFF);

would be a lot more readable.

> +	if (ret < 0) {
> +		DRM_DEV_ERROR(ctx->dev,
> +			"set_display_off cmd failed ret = %d\n",
> +			ret);
> +	}
> +
> +	/* 120ms delay required here as per DCS spec */
> +	msleep(120);
> +
> +	truly_call_write_func(ret, truly_dcs_write, panel,
> +		MIPI_DCS_ENTER_SLEEP_MODE);

See above.

> +	if (ret < 0) {
> +		DRM_DEV_ERROR(ctx->dev,
> +			"enter_sleep cmd failed ret = %d\n",
> +			ret);
> +	}
> +
> +	ret = truly_nt35597_power_off(ctx);
> +	if (ret < 0)
> +		DRM_DEV_ERROR(ctx->dev,
> +			"truly_nt35597_power_off failed ret = %d\n",
> +			ret);
> +
> +	ctx->prepared = false;
> +	return ret;
> +}
> +
> +static int truly_nt35597_prepare(struct drm_panel *panel)
> +{
> +	struct truly_nt35597 *ctx = panel_to_ctx(panel);
> +	int ret;
> +	int i;
> +	struct cmd_set *panel_on_cmds;
> +	const struct nt35597_config *config;
> +	u32 num_cmds;
> +
> +	if (ctx->prepared)
> +		return 0;
> +
> +	ret = truly_35597_power_on(ctx);
> +	if (ret < 0)
> +		return ret;
> +
> +	ctx->dsi[0]->mode_flags |= MIPI_DSI_MODE_LPM;
> +	ctx->dsi[1]->mode_flags |= MIPI_DSI_MODE_LPM;
> +
> +	config = ctx->config;
> +	panel_on_cmds = (struct cmd_set *)config->panel_on_cmds;
> +	num_cmds = config->num_on_cmds;
> +
> +	for (i = 0; i < num_cmds; i++)
> +		truly_write_buf_func(ret, truly_dcs_write_buf,
> +			panel, panel_on_cmds[i].size,
> +			panel_on_cmds[i].commands);

See above. Also, why not stop immediately when a dcs write command
fails?

> +	if (ret < 0) {
> +		DRM_DEV_ERROR(ctx->dev,
> +			"panel_cmds_set failed ret = %d\n",
> +			ret);
> +	}
> +
> +	/* As per DSI spec need to wait for 120ms
> +	 * after sending the exit sleep DCS command
> +	 */
> +	truly_call_write_func(ret, truly_dcs_write, panel,
> +		MIPI_DCS_EXIT_SLEEP_MODE);

See above.

> +
> +	if (ret < 0) {
> +		DRM_DEV_ERROR(ctx->dev,
> +			"exit_sleep_mode cmd failed ret = %d\n",
> +			ret);
> +	}
> +
> +	msleep(120);
> +
> +	truly_call_write_func(ret, truly_dcs_write, panel,
> +		MIPI_DCS_SET_DISPLAY_ON);
> +
> +	if (ret < 0) {
> +		DRM_DEV_ERROR(ctx->dev,
> +			"set_display_on cmd failed ret = %d\n",
> +			ret);
> +	}
> +
> +	/* Adding 120ms delay before the start of
> +	 * pixel stream to the panel after sending
> +	 * the set_display_on DCS command
> +	 */
> +
> +	msleep(120);
> +
> +	ctx->prepared = true;
> +
> +	return 0;
> +}
> +
> +static int truly_nt35597_enable(struct drm_panel *panel)
> +{
> +	struct truly_nt35597 *ctx = panel_to_ctx(panel);
> +	int ret;
> +
> +	if (ctx->enabled)
> +		return 0;
> +
> +	if (ctx->backlight) {
> +		ret = backlight_enable(ctx->backlight);
> +		if (ret < 0)
> +			DRM_DEV_ERROR(ctx->dev, "backlight enable failed %d\n",
> +						  ret);
> +	}
> +
> +	ctx->enabled = true;
> +
> +	return 0;
> +}
> +
> +static int truly_nt35597_get_modes(struct drm_panel *panel)
> +{
> +	struct drm_connector *connector = panel->connector;
> +	struct truly_nt35597 *ctx = panel_to_ctx(panel);
> +	struct drm_display_mode *mode;
> +	const struct nt35597_config *config;
> +
> +	config = ctx->config;
> +	mode = drm_mode_create(connector->dev);
> +	if (!mode) {
> +		DRM_DEV_ERROR(ctx->dev,
> +			"failed to create a new display mode\n");
> +		return 0;
> +	}
> +
> +	connector->display_info.width_mm = config->width_mm;
> +	connector->display_info.height_mm = config->height_mm;
> +	/* Copy the mode from the DT and add it */

This comment is not accurate, the mode is from inside the driver,
currently qcom_sdm845_mtp_2k_mode below.

> +	drm_mode_copy(mode, config->dm);
> +	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
> +	drm_mode_probed_add(connector, mode);
> +
> +	return 1;
> +}
> +
> +static const struct drm_panel_funcs truly_nt35597_drm_funcs = {
> +	.disable = truly_nt35597_disable,
> +	.unprepare = truly_nt35597_unprepare,
> +	.prepare = truly_nt35597_prepare,
> +	.enable = truly_nt35597_enable,
> +	.get_modes = truly_nt35597_get_modes,
> +};
> +
> +static int truly_nt35597_panel_add(struct truly_nt35597 *ctx)
> +{
> +	struct device *dev = ctx->dev;
> +	int ret, i;
> +	const struct nt35597_config *config;
> +
> +	config = ctx->config;
> +	for (i = 0; i < ARRAY_SIZE(ctx->supplies); i++)
> +		ctx->supplies[i].supply = regulator_names[i];
> +
> +	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ctx->supplies),
> +				      ctx->supplies);
> +	if (ret < 0)
> +		return ret;
> +
> +	ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
> +	if (IS_ERR(ctx->reset_gpio)) {
> +		DRM_DEV_ERROR(dev, "cannot get reset gpio %ld\n",
> +			PTR_ERR(ctx->reset_gpio));
> +		return PTR_ERR(ctx->reset_gpio);
> +	}
> +
> +	ctx->mode_gpio = devm_gpiod_get(dev, "mode", GPIOD_OUT_LOW);
> +	if (IS_ERR(ctx->mode_gpio)) {
> +		DRM_DEV_ERROR(dev, "cannot get mode gpio %ld\n",
> +			PTR_ERR(ctx->mode_gpio));
> +		return PTR_ERR(ctx->mode_gpio);
> +	}
> +
> +	/* dual port */
> +	gpiod_set_value(ctx->mode_gpio, 0);
> +
> +	drm_panel_init(&ctx->panel);
> +	ctx->panel.dev = dev;
> +	ctx->panel.funcs = &truly_nt35597_drm_funcs;
> +	drm_panel_add(&ctx->panel);
> +
> +	return 0;
> +}
> +
> +static struct drm_display_mode qcom_sdm845_mtp_2k_mode = {

static const ...

> +	.name = "1440x2560",
> +	.clock = 268316,
> +	.hdisplay = 1440,
> +	.hsync_start = 1440 + 200,
> +	.hsync_end = 1440 + 200 + 32,
> +	.htotal = 1440 + 200 + 32 + 64,
> +	.vdisplay = 2560,
> +	.vsync_start = 2560 + 8,
> +	.vsync_end = 2560 + 8 + 1,
> +	.vtotal = 2560 + 8 + 1 + 7,
> +	.vrefresh = 60,
> +	.flags = 0,
> +};
> +
> +static struct nt35597_config nt35597_dir = {

static const ...

> +	.width_mm = 74,
> +	.height_mm = 131,
> +	.panel_name = "qcom_sdm845_mtp_2k_panel",
> +	.dm = &qcom_sdm845_mtp_2k_mode,
> +	.panel_on_cmds = qcom_2k_panel_magic_cmds,
> +	.num_on_cmds = ARRAY_SIZE(qcom_2k_panel_magic_cmds),
> +};
> +
> +static int truly_nt35597_probe(struct mipi_dsi_device *dsi)
> +{
> +	struct device *dev = &dsi->dev;
> +	struct truly_nt35597 *ctx;
> +	struct mipi_dsi_device *dsi1_device;
> +	struct device_node *dsi1;
> +	struct mipi_dsi_host *dsi1_host;
> +	struct mipi_dsi_device *dsi_dev;
> +	int ret = 0;
> +	int i;
> +
> +	const struct mipi_dsi_device_info info = {.type = "trulynt35597",

.type should be on the next line.

> +		.channel = 0,
> +		.node = NULL,
> +	};
> +
> +	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
> +
> +	if (!ctx)
> +		return -ENOMEM;
> +
> +	/* This device represents itself as one with
> +	 * two input ports which are fed by the output
> +	 * ports of the two DSI controllers . The DSI0
> +	 * is the master controller and has most of the
> +	 * panel related info in its child node.
> +	 */
> +
> +	ctx->config = of_device_get_match_data(dev);
> +
> +	if (!ctx->config) {
> +		dev_err(dev, "missing device configuration\n");
> +		return -ENODEV;
> +	}
> +
> +	dsi1 = of_graph_get_remote_node(dsi->dev.of_node, 1, -1);
> +	if (!dsi1) {
> +		DRM_DEV_ERROR(dev,
> +			"failed to get remote node for dsi1_device\n");
> +		ret = -ENODEV;
> +		goto err_get_remote;
> +	}
> +
> +	dsi1_host = of_find_mipi_dsi_host_by_node(dsi1);
> +	if (!dsi1_host) {
> +		DRM_DEV_ERROR(dev, "failed to find dsi host\n");
> +		ret = -EPROBE_DEFER;
> +		goto err_host;
> +	}
> +
> +	of_node_put(dsi1);
> +
> +	/* register the second DSI device */
> +	dsi1_device = mipi_dsi_device_register_full(dsi1_host, &info);
> +	if (IS_ERR(dsi1_device)) {
> +		DRM_DEV_ERROR(dev, "failed to create dsi device\n");
> +		ret = PTR_ERR(dsi);
> +		goto err_dsi_device;
> +	}
> +
> +	mipi_dsi_set_drvdata(dsi, ctx);
> +
> +	ctx->dev = dev;
> +	ctx->dsi[0] = dsi;
> +	ctx->dsi[1] = dsi1_device;
> +
> +	ret = truly_nt35597_panel_add(ctx);
> +	if (ret) {
> +		DRM_DEV_ERROR(dev, "failed to add panel\n");
> +		goto err_panel_add;
> +	}
> +
> +	for (i = 0; i < ARRAY_SIZE(ctx->dsi); i++) {
> +		dsi_dev = ctx->dsi[i];
> +		dsi_dev->lanes = 4;
> +		dsi_dev->format = MIPI_DSI_FMT_RGB888;
> +		dsi_dev->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_LPM |
> +			MIPI_DSI_CLOCK_NON_CONTINUOUS;
> +		ret = mipi_dsi_attach(dsi_dev);
> +		if (ret < 0) {
> +			DRM_DEV_ERROR(dev,
> +				"dsi attach failed i = %d\n", i);
> +				goto err_dsi_attach;
> +		}
> +	}
> +
> +	return 0;
> +
> +err_dsi_attach:
> +	drm_panel_remove(&ctx->panel);
> +err_panel_add:
> +	mipi_dsi_device_unregister(dsi1_device);
> +err_dsi_device:
> +err_host:
> +	of_node_put(dsi1);
> +err_get_remote:
> +	return ret;
> +}
> +
> +static int truly_nt35597_remove(struct mipi_dsi_device *dsi)
> +{
> +	struct truly_nt35597 *ctx = mipi_dsi_get_drvdata(dsi);
> +
> +	if (ctx->dsi[0])
> +		mipi_dsi_detach(ctx->dsi[0]);
> +	if (ctx->dsi[1]) {
> +		mipi_dsi_detach(ctx->dsi[1]);
> +		mipi_dsi_device_unregister(ctx->dsi[1]);
> +	}
> +
> +	drm_panel_remove(&ctx->panel);
> +	return 0;
> +}
> +
> +static const struct of_device_id truly_wqxga_of_match[] = {

Should this table be renamed to truly_nt36697_of_match?

> +	{	.compatible = "qcom,sdm845-mtp-2K-display",
> +		.data = &nt35597_dir,
> +	},
> +
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(of, truly_wqxga_of_match);
> +
> +static struct mipi_dsi_driver truly_wqxga_driver = {
> +	.driver = {
> +		.name = "panel_truly_nt35597",
> +		.of_match_table = truly_wqxga_of_match,
> +	},
> +	.probe = truly_nt35597_probe,
> +	.remove = truly_nt35597_remove,
> +};
> +module_mipi_dsi_driver(truly_wqxga_driver);
> +
> +MODULE_DESCRIPTION("Truly NT35597 DSI Panel Driver");
> +MODULE_LICENSE("GPL v2");

regards
Philipp
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