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Date: Fri, 9 Feb 2024 18:17:32 -0500
From: Richard Acayan <mailingradian@gmail.com>
To: Jessica Zhang <quic_jesszhan@quicinc.com>
Cc: Neil Armstrong <neil.armstrong@linaro.org>,
	Sam Ravnborg <sam@ravnborg.org>, David Airlie <airlied@gmail.com>,
	Daniel Vetter <daniel@ffwll.ch>,
	Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
	Maxime Ripard <mripard@kernel.org>,
	Thomas Zimmermann <tzimmermann@suse.de>,
	Rob Herring <robh@kernel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
	Conor Dooley <conor+dt@kernel.org>,
	Bjorn Andersson <andersson@kernel.org>,
	Konrad Dybcio <konrad.dybcio@linaro.org>,
	Thierry Reding <thierry.reding@gmail.com>,
	dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org,
	linux-arm-msm@vger.kernel.org
Subject: Re: [PATCH 2/3] drm/panel: add samsung s6e3fa7 panel driver
Message-ID: <ZcayjJxSKwprA0y_@radian>
References: <20240209001639.387374-6-mailingradian@gmail.com>
 <20240209001639.387374-8-mailingradian@gmail.com>
 <09ef60d6-8404-4a2f-b2f5-8cd77668e4f0@quicinc.com>
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In-Reply-To: <09ef60d6-8404-4a2f-b2f5-8cd77668e4f0@quicinc.com>

On Thu, Feb 08, 2024 at 05:34:57PM -0800, Jessica Zhang wrote:
> On 2/8/2024 4:16 PM, Richard Acayan wrote:
>> The S6E3FA7 display controller is enabled in every Pixel 3a (non-XL)
>> variant. Add the driver for it, generated by
>> linux-mdss-dsi-panel-driver-generator.
>> 
>> There are other panels connected to the same S6E3FA7 display controller,
>> such as the AMS604NL01 panel, which are incompatible with this driver.
>> Name the device tree compatible after the panel model according to
>> iFixit.
>> 
>> Link: https://github.com/msm8916-mainline/linux-mdss-dsi-panel-driver-generator
>> Link: https://android.googlesource.com/kernel/msm/+/7fda1cd7b64710dafac5f34899611c6d35eb4cd2/arch/arm64/boot/dts/google/dsi-panel-s6e3fa7-1080p-cmd.dtsi
>> Link: https://github.com/msm8953-mainline/linux/blob/v6.6.12-r0/drivers/gpu/drm/panel/panel-samsung-s6e3fa7.c
>> Link: https://www.ifixit.com/Guide/Image/meta/muyjtLQTHu6MDkhK
>> Signed-off-by: Richard Acayan <mailingradian@gmail.com>
>> ---
>>   drivers/gpu/drm/panel/Kconfig                 |   9 +
>>   drivers/gpu/drm/panel/Makefile                |   1 +
>>   drivers/gpu/drm/panel/panel-samsung-s6e3fa7.c | 285 ++++++++++++++++++
>>   3 files changed, 295 insertions(+)
>>   create mode 100644 drivers/gpu/drm/panel/panel-samsung-s6e3fa7.c
>> 
>> diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
>> index 8f3783742208..a693b03f680e 100644
>> --- a/drivers/gpu/drm/panel/Kconfig
>> +++ b/drivers/gpu/drm/panel/Kconfig
>> @@ -577,6 +577,15 @@ config DRM_PANEL_SAMSUNG_DB7430
>>   	  DB7430 DPI display controller used in such devices as the
>>   	  LMS397KF04 480x800 DPI panel.
>> +config DRM_PANEL_SAMSUNG_S6E3FA7
>> +	tristate "Samsung S6E3FA7 panel driver"
>> +	depends on OF
>> +	depends on DRM_MIPI_DSI
>> +	depends on BACKLIGHT_CLASS_DEVICE
>> +	help
>> +	  Say Y here if you want to enable support for the Samsung S6E3FA7
>> +	  1920x2220 panel.
>> +
>>   config DRM_PANEL_SAMSUNG_S6D16D0
>>   	tristate "Samsung S6D16D0 DSI video mode panel"
>>   	depends on OF
>> diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
>> index d94a644d0a6c..560b62129f68 100644
>> --- a/drivers/gpu/drm/panel/Makefile
>> +++ b/drivers/gpu/drm/panel/Makefile
>> @@ -59,6 +59,7 @@ obj-$(CONFIG_DRM_PANEL_SAMSUNG_LD9040) += panel-samsung-ld9040.o
>>   obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6D16D0) += panel-samsung-s6d16d0.o
>>   obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6D27A1) += panel-samsung-s6d27a1.o
>>   obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6D7AA0) += panel-samsung-s6d7aa0.o
>> +obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E3FA7) += panel-samsung-s6e3fa7.o
>>   obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E3HA2) += panel-samsung-s6e3ha2.o
>>   obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E63J0X03) += panel-samsung-s6e63j0x03.o
>>   obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E63M0) += panel-samsung-s6e63m0.o
>> diff --git a/drivers/gpu/drm/panel/panel-samsung-s6e3fa7.c b/drivers/gpu/drm/panel/panel-samsung-s6e3fa7.c
>> new file mode 100644
>> index 000000000000..10bc8fb5f1f9
>> --- /dev/null
>> +++ b/drivers/gpu/drm/panel/panel-samsung-s6e3fa7.c
>> @@ -0,0 +1,285 @@
>> +// SPDX-License-Identifier: GPL-2.0-only
>> +/*
>> + * Driver for the Samsung S6E3FA7 panel.
>> + *
>> + * Copyright (c) 2022-2024, The Linux Foundation. All rights reserved.
>
>
> Hi Richard,
>
> Not really sure about the copyright dates -- since this is a completely new
> file to this tree, wouldn't the year be just 2024?

That would be more concise, but the original driver was generated and
added to a kernel fork [1] in 2022 and amendments have been made since then.

[1] https://gitlab.com/sdm670-mainline/linux/-/blob/sdm670-v6.2.6/drivers/gpu/drm/panel/panel-samsung-s6e3fa7.c?ref_type=tags

>
> The rest LGTM.
>
> Thanks,
>
> Jessica Zhang
>
>> + * Generated with linux-mdss-dsi-panel-driver-generator from vendor device tree:
>> + * Copyright (c) 2013, The Linux Foundation. All rights reserved.
>> + */ > +
>> +#include <linux/backlight.h>
>> +#include <linux/delay.h>
>> +#include <linux/gpio/consumer.h>
>> +#include <linux/module.h>
>> +#include <linux/of.h>
>> +
>> +#include <video/mipi_display.h>
>> +
>> +#include <drm/drm_mipi_dsi.h>
>> +#include <drm/drm_modes.h>
>> +#include <drm/drm_panel.h>
>> +
>> +struct s6e3fa7_panel {
>> +	struct drm_panel panel;
>> +	struct mipi_dsi_device *dsi;
>> +	struct gpio_desc *reset_gpio;
>> +};
>> +
>> +static inline struct s6e3fa7_panel *to_s6e3fa7_panel(struct drm_panel *panel)
>> +{
>> +	return container_of(panel, struct s6e3fa7_panel, panel);
>> +}
>> +
>> +static void s6e3fa7_panel_reset(struct s6e3fa7_panel *ctx)
>> +{
>> +	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
>> +	usleep_range(1000, 2000);
>> +	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
>> +	usleep_range(10000, 11000);
>> +}
>> +
>> +static int s6e3fa7_panel_on(struct s6e3fa7_panel *ctx)
>> +{
>> +	struct mipi_dsi_device *dsi = ctx->dsi;
>> +	struct device *dev = &dsi->dev;
>> +	int ret;
>> +
>> +	ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
>> +	if (ret < 0) {
>> +		dev_err(dev, "Failed to exit sleep mode: %d\n", ret);
>> +		return ret;
>> +	}
>> +	msleep(120);
>> +
>> +	ret = mipi_dsi_dcs_set_tear_on(dsi, MIPI_DSI_DCS_TEAR_MODE_VBLANK);
>> +	if (ret < 0) {
>> +		dev_err(dev, "Failed to set tear on: %d\n", ret);
>> +		return ret;
>> +	}
>> +
>> +	mipi_dsi_dcs_write_seq(dsi, 0xf0, 0x5a, 0x5a);
>> +	mipi_dsi_dcs_write_seq(dsi, 0xf4,
>> +			       0xbb, 0x23, 0x19, 0x3a, 0x9f, 0x0f, 0x09, 0xc0,
>> +			       0x00, 0xb4, 0x37, 0x70, 0x79, 0x69);
>> +	mipi_dsi_dcs_write_seq(dsi, 0xf0, 0xa5, 0xa5);
>> +	mipi_dsi_dcs_write_seq(dsi, MIPI_DCS_WRITE_CONTROL_DISPLAY, 0x20);
>> +
>> +	ret = mipi_dsi_dcs_set_display_on(dsi);
>> +	if (ret < 0) {
>> +		dev_err(dev, "Failed to set display on: %d\n", ret);
>> +		return ret;
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +static int s6e3fa7_panel_prepare(struct drm_panel *panel)
>> +{
>> +	struct s6e3fa7_panel *ctx = to_s6e3fa7_panel(panel);
>> +	struct device *dev = &ctx->dsi->dev;
>> +	int ret;
>> +
>> +	s6e3fa7_panel_reset(ctx);
>> +
>> +	ret = s6e3fa7_panel_on(ctx);
>> +	if (ret < 0) {
>> +		dev_err(dev, "Failed to initialize panel: %d\n", ret);
>> +		gpiod_set_value_cansleep(ctx->reset_gpio, 1);
>> +		return ret;
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +static int s6e3fa7_panel_unprepare(struct drm_panel *panel)
>> +{
>> +	struct s6e3fa7_panel *ctx = to_s6e3fa7_panel(panel);
>> +
>> +	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
>> +
>> +	return 0;
>> +}
>> +
>> +static int s6e3fa7_panel_disable(struct drm_panel *panel)
>> +{
>> +	struct s6e3fa7_panel *ctx = to_s6e3fa7_panel(panel);
>> +	struct mipi_dsi_device *dsi = ctx->dsi;
>> +	struct device *dev = &dsi->dev;
>> +	int ret;
>> +
>> +	ret = mipi_dsi_dcs_set_display_off(dsi);
>> +	if (ret < 0) {
>> +		dev_err(dev, "Failed to set display off: %d\n", ret);
>> +		return ret;
>> +	}
>> +
>> +	ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
>> +	if (ret < 0) {
>> +		dev_err(dev, "Failed to enter sleep mode: %d\n", ret);
>> +		return ret;
>> +	}
>> +	msleep(120);
>> +
>> +	return 0;
>> +}
>> +
>> +static const struct drm_display_mode s6e3fa7_panel_mode = {
>> +	.clock = (1080 + 32 + 32 + 78) * (2220 + 32 + 4 + 78) * 60 / 1000,
>> +	.hdisplay = 1080,
>> +	.hsync_start = 1080 + 32,
>> +	.hsync_end = 1080 + 32 + 32,
>> +	.htotal = 1080 + 32 + 32 + 78,
>> +	.vdisplay = 2220,
>> +	.vsync_start = 2220 + 32,
>> +	.vsync_end = 2220 + 32 + 4,
>> +	.vtotal = 2220 + 32 + 4 + 78,
>> +	.width_mm = 62,
>> +	.height_mm = 127,
>> +};
>> +
>> +static int s6e3fa7_panel_get_modes(struct drm_panel *panel,
>> +				 struct drm_connector *connector)
>> +{
>> +	struct drm_display_mode *mode;
>> +
>> +	mode = drm_mode_duplicate(connector->dev, &s6e3fa7_panel_mode);
>> +	if (!mode)
>> +		return -ENOMEM;
>> +
>> +	drm_mode_set_name(mode);
>> +
>> +	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
>> +	connector->display_info.width_mm = mode->width_mm;
>> +	connector->display_info.height_mm = mode->height_mm;
>> +	drm_mode_probed_add(connector, mode);
>> +
>> +	return 1;
>> +}
>> +
>> +static const struct drm_panel_funcs s6e3fa7_panel_funcs = {
>> +	.prepare = s6e3fa7_panel_prepare,
>> +	.unprepare = s6e3fa7_panel_unprepare,
>> +	.disable = s6e3fa7_panel_disable,
>> +	.get_modes = s6e3fa7_panel_get_modes,
>> +};
>> +
>> +static int s6e3fa7_panel_bl_update_status(struct backlight_device *bl)
>> +{
>> +	struct mipi_dsi_device *dsi = bl_get_data(bl);
>> +	u16 brightness = backlight_get_brightness(bl);
>> +	int ret;
>> +
>> +	ret = mipi_dsi_dcs_set_display_brightness_large(dsi, brightness);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	return 0;
>> +}
>> +
>> +static int s6e3fa7_panel_bl_get_brightness(struct backlight_device *bl)
>> +{
>> +	struct mipi_dsi_device *dsi = bl_get_data(bl);
>> +	u16 brightness;
>> +	int ret;
>> +
>> +	ret = mipi_dsi_dcs_get_display_brightness_large(dsi, &brightness);
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	return brightness;
>> +}
>> +
>> +static const struct backlight_ops s6e3fa7_panel_bl_ops = {
>> +	.update_status = s6e3fa7_panel_bl_update_status,
>> +	.get_brightness = s6e3fa7_panel_bl_get_brightness,
>> +};
>> +
>> +static struct backlight_device *
>> +s6e3fa7_panel_create_backlight(struct mipi_dsi_device *dsi)
>> +{
>> +	struct device *dev = &dsi->dev;
>> +	const struct backlight_properties props = {
>> +		.type = BACKLIGHT_RAW,
>> +		.brightness = 1023,
>> +		.max_brightness = 1023,
>> +	};
>> +
>> +	return devm_backlight_device_register(dev, dev_name(dev), dev, dsi,
>> +					      &s6e3fa7_panel_bl_ops, &props);
>> +}
>> +
>> +static int s6e3fa7_panel_probe(struct mipi_dsi_device *dsi)
>> +{
>> +	struct device *dev = &dsi->dev;
>> +	struct s6e3fa7_panel *ctx;
>> +	int ret;
>> +
>> +	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
>> +	if (!ctx)
>> +		return -ENOMEM;
>> +
>> +	ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
>> +	if (IS_ERR(ctx->reset_gpio))
>> +		return dev_err_probe(dev, PTR_ERR(ctx->reset_gpio),
>> +				     "Failed to get reset-gpios\n");
>> +
>> +	ctx->dsi = dsi;
>> +	mipi_dsi_set_drvdata(dsi, ctx);
>> +
>> +	dsi->lanes = 4;
>> +	dsi->format = MIPI_DSI_FMT_RGB888;
>> +	dsi->mode_flags = MIPI_DSI_MODE_VIDEO_BURST |
>> +			  MIPI_DSI_CLOCK_NON_CONTINUOUS | MIPI_DSI_MODE_LPM;
>> +
>> +	drm_panel_init(&ctx->panel, dev, &s6e3fa7_panel_funcs,
>> +		       DRM_MODE_CONNECTOR_DSI);
>> +	ctx->panel.prepare_prev_first = true;
>> +
>> +	ctx->panel.backlight = s6e3fa7_panel_create_backlight(dsi);
>> +	if (IS_ERR(ctx->panel.backlight))
>> +		return dev_err_probe(dev, PTR_ERR(ctx->panel.backlight),
>> +				     "Failed to create backlight\n");
>> +
>> +	drm_panel_add(&ctx->panel);
>> +
>> +	ret = mipi_dsi_attach(dsi);
>> +	if (ret < 0) {
>> +		dev_err(dev, "Failed to attach to DSI host: %d\n", ret);
>> +		drm_panel_remove(&ctx->panel);
>> +		return ret;
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +static void s6e3fa7_panel_remove(struct mipi_dsi_device *dsi)
>> +{
>> +	struct s6e3fa7_panel *ctx = mipi_dsi_get_drvdata(dsi);
>> +	int ret;
>> +
>> +	ret = mipi_dsi_detach(dsi);
>> +	if (ret < 0)
>> +		dev_err(&dsi->dev, "Failed to detach from DSI host: %d\n", ret);
>> +
>> +	drm_panel_remove(&ctx->panel);
>> +}
>> +
>> +static const struct of_device_id s6e3fa7_panel_of_match[] = {
>> +	{ .compatible = "samsung,s6e3fa7-ams559nk06" },
>> +	{ /* sentinel */ }
>> +};
>> +MODULE_DEVICE_TABLE(of, s6e3fa7_panel_of_match);
>> +
>> +static struct mipi_dsi_driver s6e3fa7_panel_driver = {
>> +	.probe = s6e3fa7_panel_probe,
>> +	.remove = s6e3fa7_panel_remove,
>> +	.driver = {
>> +		.name = "panel-samsung-s6e3fa7",
>> +		.of_match_table = s6e3fa7_panel_of_match,
>> +	},
>> +};
>> +module_mipi_dsi_driver(s6e3fa7_panel_driver);
>> +
>> +MODULE_AUTHOR("Richard Acayan <mailingradian@gmail.com>");
>> +MODULE_DESCRIPTION("DRM driver for Samsung S6E3FA7 command mode DSI panel");
>> +MODULE_LICENSE("GPL");
>> -- 
>> 2.43.0
>> 
>>