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Message-ID: <f34cd6a8-6d6d-9dcf-b681-56439416c4b4@linaro.org>
Date:   Mon, 22 May 2023 04:19:45 +0300
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Subject: Re: [PATCH RFC 06/10] drm/panel/samsung-sofef01: Add panel driver for
 Sony Xperia 5 / 10 II
Content-Language: en-GB
To:     Marijn Suijten <marijn.suijten@somainline.org>,
        Neil Armstrong <neil.armstrong@linaro.org>,
        Sam Ravnborg <sam@ravnborg.org>,
        David Airlie <airlied@gmail.com>,
        Daniel Vetter <daniel@ffwll.ch>,
        Caleb Connolly <caleb@connolly.tech>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Conor Dooley <conor+dt@kernel.org>,
        Andy Gross <agross@kernel.org>,
        Bjorn Andersson <andersson@kernel.org>
Cc:     ~postmarketos/upstreaming@lists.sr.ht,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@somainline.org>,
        Konrad Dybcio <konrad.dybcio@linaro.org>,
        Martin Botka <martin.botka@somainline.org>,
        Jami Kettunen <jami.kettunen@somainline.org>,
        dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org,
        devicetree@vger.kernel.org, linux-arm-msm@vger.kernel.org,
        Abhinav Kumar <quic_abhinavk@quicinc.com>,
        Kuogee Hsieh <quic_khsieh@quicinc.com>,
        Jessica Zhang <quic_jesszhan@quicinc.com>
References: <20230521-drm-panels-sony-v1-0-541c341d6bee@somainline.org>
 <20230521-drm-panels-sony-v1-6-541c341d6bee@somainline.org>
From:   Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
In-Reply-To: <20230521-drm-panels-sony-v1-6-541c341d6bee@somainline.org>
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Precedence: bulk

On 22/05/2023 00:23, Marijn Suijten wrote:
> This SOFEF01-M Display-IC driver supports two modes with different
> compatibles to differentiate between slightly different physical sizes
> (panels) found on the Xperia 5 (6.1") and 10 II (6.0").
> 
> It is currently also used to hardcode significantly higher fake porches
> for the Xperia 5, which are unused in transfers due to this being a
> command-mode panel but do have an effect on the clock rates set by
> dsi_host.c.  Without higher clock rates this panel fails to achieve
> 60fps and has significant tearing artifacts, while the same calculated
> clock rate works perfectly fine on the Xperia 10 II.
> 
> Signed-off-by: Marijn Suijten <marijn.suijten@somainline.org>
> ---
>   drivers/gpu/drm/panel/Kconfig                 |  12 +
>   drivers/gpu/drm/panel/Makefile                |   1 +
>   drivers/gpu/drm/panel/panel-samsung-sofef01.c | 360 ++++++++++++++++++++++++++
>   3 files changed, 373 insertions(+)
> 
> diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
> index 18bd116e78a71..3f11e9906f2cb 100644
> --- a/drivers/gpu/drm/panel/Kconfig
> +++ b/drivers/gpu/drm/panel/Kconfig
> @@ -618,6 +618,18 @@ config DRM_PANEL_SAMSUNG_SOFEF00
>   
>   	  The panels are 2280x1080@60Hz and 2340x1080@60Hz respectively
>   
> +config DRM_PANEL_SAMSUNG_SOFEF01
> +	tristate "Samsung sofef01 Sony Xperia 5 / 10 II DSI cmd mode panels"
> +	depends on GPIOLIB
> +	depends on OF
> +	depends on DRM_MIPI_DSI
> +	depends on BACKLIGHT_CLASS_DEVICE
> +	help
> +	  Say Y or M here if you want to enable support for the Samsung AMOLED
> +	  command mode panels found in the Sony Xperia 5 / 10 II smartphones.
> +
> +	  This panel features a fixed mode of 1080x2520@60.
> +
>   config DRM_PANEL_SEIKO_43WVF1G
>   	tristate "Seiko 43WVF1G panel"
>   	depends on OF
> diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
> index 85133f73558f3..a4039d0fc9cfb 100644
> --- a/drivers/gpu/drm/panel/Makefile
> +++ b/drivers/gpu/drm/panel/Makefile
> @@ -62,6 +62,7 @@ obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E63M0_DSI) += panel-samsung-s6e63m0-dsi.o
>   obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E88A0_AMS452EF01) += panel-samsung-s6e88a0-ams452ef01.o
>   obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E8AA0) += panel-samsung-s6e8aa0.o
>   obj-$(CONFIG_DRM_PANEL_SAMSUNG_SOFEF00) += panel-samsung-sofef00.o
> +obj-$(CONFIG_DRM_PANEL_SAMSUNG_SOFEF01) += panel-samsung-sofef01.o
>   obj-$(CONFIG_DRM_PANEL_SEIKO_43WVF1G) += panel-seiko-43wvf1g.o
>   obj-$(CONFIG_DRM_PANEL_SHARP_LQ101R1SX01) += panel-sharp-lq101r1sx01.o
>   obj-$(CONFIG_DRM_PANEL_SHARP_LS037V7DW01) += panel-sharp-ls037v7dw01.o
> diff --git a/drivers/gpu/drm/panel/panel-samsung-sofef01.c b/drivers/gpu/drm/panel/panel-samsung-sofef01.c
> new file mode 100644
> index 0000000000000..18dc67a301a7b
> --- /dev/null
> +++ b/drivers/gpu/drm/panel/panel-samsung-sofef01.c
> @@ -0,0 +1,360 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +// Copyright (c) 2023 Marijn Suijten <marijn.suijten@somainline.org>
> +
> +#include <linux/backlight.h>
> +#include <linux/delay.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/regulator/consumer.h>
> +
> +#include <video/mipi_display.h>
> +
> +#include <drm/drm_mipi_dsi.h>
> +#include <drm/drm_modes.h>
> +#include <drm/drm_panel.h>
> +#include <drm/drm_probe_helper.h>
> +
> +struct samsung_sofef01_m {
> +	struct drm_panel panel;
> +	struct mipi_dsi_device *dsi;
> +	struct regulator *vddio, *vci;
> +	struct gpio_desc *reset_gpio;
> +	const struct drm_display_mode *mode;
> +	bool prepared;
> +};
> +
> +static inline struct samsung_sofef01_m *to_samsung_sofef01_m(struct drm_panel *panel)
> +{
> +	return container_of(panel, struct samsung_sofef01_m, panel);
> +}
> +
> +static void samsung_sofef01_m_reset(struct samsung_sofef01_m *ctx)
> +{
> +	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
> +	usleep_range(10000, 11000);
> +}
> +
> +static int samsung_sofef01_m_on(struct samsung_sofef01_m *ctx)
> +{
> +	struct mipi_dsi_device *dsi = ctx->dsi;
> +	struct device *dev = &dsi->dev;
> +	int ret;
> +
> +	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
> +
> +	ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
> +	if (ret < 0) {
> +		dev_err(dev, "Failed to exit sleep mode: %d\n", ret);
> +		return ret;
> +	}
> +	usleep_range(10000, 11000);
> +
> +	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, 0xdf, 0x03);
> +	mipi_dsi_dcs_write_seq(dsi, 0xe0, 0x01);
> +	mipi_dsi_dcs_write_seq(dsi, 0xf0, 0xa5, 0xa5);
> +
> +	ret = mipi_dsi_dcs_set_page_address(dsi, 0x0000, 2520 - 1);
> +	if (ret < 0) {
> +		dev_err(dev, "Failed to set page address: %d\n", ret);
> +		return ret;
> +	}
> +
> +	mipi_dsi_dcs_write_seq(dsi, MIPI_DCS_WRITE_CONTROL_DISPLAY, 0x20);
> +	mipi_dsi_dcs_write_seq(dsi, MIPI_DCS_WRITE_POWER_SAVE, 0x00);
> +	mipi_dsi_dcs_write_seq(dsi, 0xf0, 0x5a, 0x5a);
> +	mipi_dsi_dcs_write_seq(dsi, 0xbe, 0x92, 0x29);
> +	mipi_dsi_dcs_write_seq(dsi, 0xf0, 0xa5, 0xa5);
> +	mipi_dsi_dcs_write_seq(dsi, 0xf0, 0x5a, 0x5a);
> +	mipi_dsi_dcs_write_seq(dsi, 0xb0, 0x06);
> +	mipi_dsi_dcs_write_seq(dsi, 0xb6, 0x90);
> +	mipi_dsi_dcs_write_seq(dsi, 0xf0, 0xa5, 0xa5);
> +	msleep(110);
> +
> +	ret = mipi_dsi_dcs_set_display_on(dsi);
> +	if (ret < 0) {
> +		dev_err(dev, "Failed to turn display on: %d\n", ret);
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +static int samsung_sofef01_m_off(struct samsung_sofef01_m *ctx)
> +{
> +	struct mipi_dsi_device *dsi = ctx->dsi;
> +	struct device *dev = &dsi->dev;
> +	int ret;
> +
> +	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
> +
> +	ret = mipi_dsi_dcs_set_display_off(dsi);
> +	if (ret < 0) {
> +		dev_err(dev, "Failed to turn display off: %d\n", ret);
> +		return ret;
> +	}
> +	msleep(20);
> +
> +	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 int samsung_sofef01_m_prepare(struct drm_panel *panel)
> +{
> +	struct samsung_sofef01_m *ctx = to_samsung_sofef01_m(panel);
> +	struct device *dev = &ctx->dsi->dev;
> +	int ret;
> +
> +	if (ctx->prepared)
> +		return 0;
> +
> +	ret = regulator_enable(ctx->vddio);
> +	if (ret < 0) {
> +		dev_err(dev, "Failed to enable vddio regulator: %d\n", ret);
> +		return ret;
> +	}
> +
> +	ret = regulator_enable(ctx->vci);
> +	if (ret < 0) {
> +		dev_err(dev, "Failed to enable vci regulator: %d\n", ret);
> +		regulator_disable(ctx->vddio);
> +		return ret;
> +	}
> +
> +	samsung_sofef01_m_reset(ctx);
> +
> +	ret = samsung_sofef01_m_on(ctx);
> +	if (ret < 0) {
> +		dev_err(dev, "Failed to initialize panel: %d\n", ret);
> +		gpiod_set_value_cansleep(ctx->reset_gpio, 1);
> +		regulator_disable(ctx->vci);
> +		regulator_disable(ctx->vddio);
> +		return ret;
> +	}
> +
> +	ctx->prepared = true;
> +	return 0;
> +}
> +
> +static int samsung_sofef01_m_unprepare(struct drm_panel *panel)
> +{
> +	struct samsung_sofef01_m *ctx = to_samsung_sofef01_m(panel);
> +	struct device *dev = &ctx->dsi->dev;
> +	int ret;
> +
> +	if (!ctx->prepared)
> +		return 0;
> +
> +	ret = samsung_sofef01_m_off(ctx);
> +	if (ret < 0)
> +		dev_err(dev, "Failed to un-initialize panel: %d\n", ret);
> +
> +	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
> +	regulator_disable(ctx->vci);
> +	regulator_disable(ctx->vddio);
> +
> +	ctx->prepared = false;
> +	return 0;
> +}
> +
> +static int samsung_sofef01_m_get_modes(struct drm_panel *panel,
> +				       struct drm_connector *connector)
> +{
> +	struct samsung_sofef01_m *ctx = to_samsung_sofef01_m(panel);
> +
> +	return drm_connector_helper_get_modes_fixed(connector, ctx->mode);
> +}
> +
> +static const struct drm_panel_funcs samsung_sofef01_m_panel_funcs = {
> +	.prepare = samsung_sofef01_m_prepare,
> +	.unprepare = samsung_sofef01_m_unprepare,
> +	.get_modes = samsung_sofef01_m_get_modes,
> +};
> +
> +static int samsung_sofef01_m_bl_update_status(struct backlight_device *bl)
> +{
> +	struct mipi_dsi_device *dsi = bl_get_data(bl);
> +	u16 brightness = backlight_get_brightness(bl);
> +	int ret;
> +
> +	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
> +
> +	ret = mipi_dsi_dcs_set_display_brightness_large(dsi, brightness);
> +	if (ret < 0)
> +		return ret;
> +
> +	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
> +
> +	return 0;
> +}
> +
> +static int samsung_sofef01_m_bl_get_brightness(struct backlight_device *bl)
> +{
> +	struct mipi_dsi_device *dsi = bl_get_data(bl);
> +	u16 brightness;
> +	int ret;
> +
> +	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
> +
> +	ret = mipi_dsi_dcs_get_display_brightness_large(dsi, &brightness);
> +
> +	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
> +
> +	if (ret < 0)
> +		return ret;
> +
> +	return brightness;
> +}
> +
> +static const struct backlight_ops samsung_sofef01_m_bl_ops = {
> +	.update_status = samsung_sofef01_m_bl_update_status,
> +	.get_brightness = samsung_sofef01_m_bl_get_brightness,
> +};
> +
> +static struct backlight_device *
> +samsung_sofef01_m_create_backlight(struct mipi_dsi_device *dsi)
> +{
> +	struct device *dev = &dsi->dev;
> +	const struct backlight_properties props = {
> +		.type = BACKLIGHT_RAW,
> +		.brightness = 100,
> +		.max_brightness = 1023,
> +	};
> +
> +	return devm_backlight_device_register(dev, dev_name(dev), dev, dsi,
> +					      &samsung_sofef01_m_bl_ops, &props);
> +}
> +
> +static int samsung_sofef01_m_probe(struct mipi_dsi_device *dsi)
> +{
> +	struct device *dev = &dsi->dev;
> +	struct samsung_sofef01_m *ctx;
> +	int ret;
> +
> +	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
> +	if (!ctx)
> +		return -ENOMEM;
> +
> +	ctx->vddio = devm_regulator_get(dev, "vddio");
> +	if (IS_ERR(ctx->vddio))
> +		return dev_err_probe(dev, PTR_ERR(ctx->vddio),
> +				     "Failed to get vddio regulator\n");
> +
> +	ctx->vci = devm_regulator_get(dev, "vci");
> +	if (IS_ERR(ctx->vci))
> +		return dev_err_probe(dev, PTR_ERR(ctx->vci),
> +				     "Failed to get vci regulator\n");
> +
> +	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;
> +	ctx->mode = of_device_get_match_data(dev);
> +	mipi_dsi_set_drvdata(dsi, ctx);
> +
> +	dsi->lanes = 4;
> +	dsi->format = MIPI_DSI_FMT_RGB888;
> +	dsi->mode_flags = MIPI_DSI_CLOCK_NON_CONTINUOUS;
> +
> +	drm_panel_init(&ctx->panel, dev, &samsung_sofef01_m_panel_funcs,
> +		       DRM_MODE_CONNECTOR_DSI);
> +
> +	ctx->panel.backlight = samsung_sofef01_m_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 samsung_sofef01_m_remove(struct mipi_dsi_device *dsi)
> +{
> +	struct samsung_sofef01_m *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);
> +}
> +
> +/* Sony Xperia 5 (kumano bahamut) */
> +static const struct drm_display_mode samsung_sofef01_m_bahamut_mode = {
> +	/*
> +	 * WARNING: These massive porches are wrong/useless for CMDmode
> +	 * (and not defined in downstream DTS) but necessary to bump dsi
> +	 * clocks higher, so that we can achieve proper 60fps without tearing.
> +	 */
> +	.clock = (1080 + 156 + 8 + 8) * (2520 + 2393 + 8 + 8) * 60 / 1000,
> +	.hdisplay = 1080,
> +	.hsync_start = 1080 + 156,
> +	.hsync_end = 1080 + 156 + 8,
> +	.htotal = 1080 + 156 + 8 + 8,
> +	.vdisplay = 2520,
> +	.vsync_start = 2520 + 2393,
> +	.vsync_end = 2520 + 2393 + 8,
> +	.vtotal = 2520 + 2393 + 8 + 8,
> +	.width_mm = 61,
> +	.height_mm = 142,
> +};
> +
> +/* Sony Xperia 10 II (seine pdx201) */
> +static const struct drm_display_mode samsung_sofef01_m_pdx201_mode = {
> +	.clock = (1080 + 8 + 8 + 8) * (2520 + 8 + 8 + 8) * 60 / 1000,
> +	.hdisplay = 1080,
> +	.hsync_start = 1080 + 8,
> +	.hsync_end = 1080 + 8 + 8,
> +	.htotal = 1080 + 8 + 8 + 8,
> +	.vdisplay = 2520,
> +	.vsync_start = 2520 + 8,
> +	.vsync_end = 2520 + 8 + 8,
> +	.vtotal = 2520 + 8 + 8 + 8,
> +	.width_mm = 60,
> +	.height_mm = 139,
> +};
> +
> +static const struct of_device_id samsung_sofef01_m_of_match[] = {
> +	{ .compatible = "samsung,sofef01-m-bahamut", .data = &samsung_sofef01_m_bahamut_mode },
> +	{ .compatible = "samsung,sofef01-m-pdx201", .data = &samsung_sofef01_m_pdx201_mode },

Are there really two panels? Can we use one mode for both usecases?

> +	{ /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, samsung_sofef01_m_of_match);
> +
> +static struct mipi_dsi_driver samsung_sofef01_m_driver = {
> +	.probe = samsung_sofef01_m_probe,
> +	.remove = samsung_sofef01_m_remove,
> +	.driver = {
> +		.name = "panel-samsung-sofef01-m",
> +		.of_match_table = samsung_sofef01_m_of_match,
> +	},
> +};
> +module_mipi_dsi_driver(samsung_sofef01_m_driver);
> +
> +MODULE_AUTHOR("Marijn Suijten <marijn.suijten@somainline.org>");
> +MODULE_DESCRIPTION("DRM panel driver for Samsung SOFEF01-M Display-IC panels");
> +MODULE_LICENSE("GPL");
> 

-- 
With best wishes
Dmitry