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Date:   Wed, 13 Jul 2022 17:15:49 +0200
From:   Sam Ravnborg <sam@ravnborg.org>
To:     Konrad Dybcio <konrad.dybcio@somainline.org>
Cc:     ~postmarketos/upstreaming@lists.sr.ht,
        David Airlie <airlied@linux.ie>, linux-kernel@vger.kernel.org,
        jamipkettunen@somainline.org,
        Thierry Reding <thierry.reding@gmail.com>,
        martin.botka@somainline.org, dri-devel@lists.freedesktop.org,
        angelogioacchino.delregno@somainline.org,
        marijn.suijten@somainline.org
Subject: Re: [PATCH 2/2] gpu/drm/panel: Add Sony TD4353 JDI panel driver
Message-ID: <Ys7hpfX9rw+Uam0P@ravnborg.org>
References: <20220712200244.960018-1-konrad.dybcio@somainline.org>
 <20220712200244.960018-2-konrad.dybcio@somainline.org>
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Hi Konrad,

thanks for submitting this driver. I know a new version is pending with
the bindings changes but here is a few more things to address.

	Sam


On Tue, Jul 12, 2022 at 10:02:41PM +0200, Konrad Dybcio wrote:
> Add support for the Sony TD4353 JDI 2160x1080 display panel used in
> some Sony Xperia XZ2 and XZ2 Compact smartphones. Due to the specifics
> of smartphone manufacturing, it is impossible to retrieve a better name
> for this panel.
> 
> This revision adds support for the default 60 Hz configuration, however
> there could possibly be some room for expansion, as the display panels
> used on Sony devices have historically been capable of >2x refresh rate
> overclocking.
> ---
>  drivers/gpu/drm/panel/Kconfig                 |  10 +
>  drivers/gpu/drm/panel/Makefile                |   1 +
>  drivers/gpu/drm/panel/panel-sony-td4353-jdi.c | 352 ++++++++++++++++++
>  3 files changed, 363 insertions(+)
>  create mode 100644 drivers/gpu/drm/panel/panel-sony-td4353-jdi.c
> 
> diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
> index 38799effd00a..1baa0a2c36bd 100644
> --- a/drivers/gpu/drm/panel/Kconfig
> +++ b/drivers/gpu/drm/panel/Kconfig
> @@ -624,6 +624,16 @@ config DRM_PANEL_SONY_ACX565AKM
>  	  Say Y here if you want to enable support for the Sony ACX565AKM
>  	  800x600 3.5" panel (found on the Nokia N900).
>  
> +config DRM_PANEL_SONY_TD4353_JDI
> +	tristate "Sony TD4353 JDI panel"
> +	depends on GPIOLIB && OF
> +	depends on DRM_MIPI_DSI
> +	depends on BACKLIGHT_CLASS_DEVICE
> +	help
> +	  Say Y here if you want to enable support for the Sony Tama
> +	  TD4353 JDI command mode panel as found on some Sony Xperia
> +	  XZ2 and XZ2 Compact smartphones.
> +
>  config DRM_PANEL_SONY_TULIP_TRULY_NT35521
>  	tristate "Sony Tulip Truly NT35521 panel"
>  	depends on GPIOLIB && OF
> diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
> index eabd4d6a1845..df8a6b707dbb 100644
> --- a/drivers/gpu/drm/panel/Makefile
> +++ b/drivers/gpu/drm/panel/Makefile
> @@ -63,6 +63,7 @@ obj-$(CONFIG_DRM_PANEL_SITRONIX_ST7701) += panel-sitronix-st7701.o
>  obj-$(CONFIG_DRM_PANEL_SITRONIX_ST7703) += panel-sitronix-st7703.o
>  obj-$(CONFIG_DRM_PANEL_SITRONIX_ST7789V) += panel-sitronix-st7789v.o
>  obj-$(CONFIG_DRM_PANEL_SONY_ACX565AKM) += panel-sony-acx565akm.o
> +obj-$(CONFIG_DRM_PANEL_SONY_TD4353_JDI) += panel-sony-td4353-jdi.o
>  obj-$(CONFIG_DRM_PANEL_SONY_TULIP_TRULY_NT35521) += panel-sony-tulip-truly-nt35521.o
>  obj-$(CONFIG_DRM_PANEL_TDO_TL070WSH30) += panel-tdo-tl070wsh30.o
>  obj-$(CONFIG_DRM_PANEL_TPO_TD028TTEC1) += panel-tpo-td028ttec1.o
> diff --git a/drivers/gpu/drm/panel/panel-sony-td4353-jdi.c b/drivers/gpu/drm/panel/panel-sony-td4353-jdi.c
> new file mode 100644
> index 000000000000..8bc2e55af63c
> --- /dev/null
> +++ b/drivers/gpu/drm/panel/panel-sony-td4353-jdi.c
> @@ -0,0 +1,352 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright (c) 2022 Konrad Dybcio <konrad.dybcio@somainline.org>
> + *
> + * Generated with linux-mdss-dsi-panel-driver-generator with a
> + * substantial amount of manual adjustments.
> + *
> + * SONY Downstream kernel calls this one:
> + * - "JDI ID3" for Akari
> + * - "JDI ID4" for Apollo
> + */
> +
> +#include <linux/delay.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_device.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>
> +
> +enum {
> +	TYPE_AKARI_60HZ,
> +	TYPE_APOLLO_60HZ
> +};
> +
> +struct sony_td4353_jdi {
> +	struct drm_panel panel;
> +	struct mipi_dsi_device *dsi;
> +	struct regulator_bulk_data supplies[3];
> +	struct gpio_desc *preset_gpio;
> +	struct gpio_desc *treset_gpio;
> +	bool prepared;
> +	int type;
> +};
> +
> +static inline struct sony_td4353_jdi *to_sony_td4353_jdi(struct drm_panel *panel)
> +{
> +	return container_of(panel, struct sony_td4353_jdi, panel);
> +}
> +
> +#define dsi_dcs_write_seq(dsi, seq...) do {				\
> +		static const u8 d[] = { seq };				\
> +		int ret;						\
> +		ret = mipi_dsi_dcs_write_buffer(dsi, d, ARRAY_SIZE(d));	\
> +		if (ret < 0)						\
> +			return ret;					\
> +	} while (0)
Use the one already defined in drm_mipi_dsi - we do not want extra
copies of the same.


> +
> +static int sony_td4353_jdi_on(struct sony_td4353_jdi *ctx)

Maybe this is just me, but I had expected that a function named "on"
would enable the power supply.

> +{
> +	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_column_address(dsi, 0x0000, 0x0437);
> +	if (ret < 0) {
> +		dev_err(dev, "Failed to set column address: %d\n", ret);
> +		return ret;
> +	}
> +
> +	ret = mipi_dsi_dcs_set_page_address(dsi, 0x0000, 0x086f);
> +	if (ret < 0) {
> +		dev_err(dev, "Failed to set page address: %d\n", ret);
> +		return ret;
> +	}
> +
> +	ret = mipi_dsi_dcs_set_tear_scanline(dsi, 0x0000);
> +	if (ret < 0) {
> +		dev_err(dev, "Failed to set tear scanline: %d\n", ret);
> +		return ret;
> +	}
> +
> +	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;
> +	}
> +
> +	dsi_dcs_write_seq(dsi, MIPI_DCS_SET_ADDRESS_MODE, 0x00);
> +
> +	ret = mipi_dsi_dcs_set_pixel_format(dsi, 0x77);
> +	if (ret < 0) {
> +		dev_err(dev, "Failed to set pixel format: %d\n", ret);
> +		return ret;
> +	}
> +
> +	dsi_dcs_write_seq(dsi, MIPI_DCS_SET_PARTIAL_ROWS,
> +			  0x00, 0x00, 0x08, 0x6f);
> +
> +	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(70);
> +
> +	dsi_dcs_write_seq(dsi, MIPI_DCS_WRITE_MEMORY_START);
> +
> +	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 sony_td4353_jdi_off(struct sony_td4353_jdi *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 set display off: %d\n", ret);
> +		return ret;
> +	}
> +	msleep(22);
> +
> +	ret = mipi_dsi_dcs_set_tear_off(dsi);
> +	if (ret < 0) {
> +		dev_err(dev, "Failed to set tear 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(80);
> +
> +	return 0;
> +}
> +
> +static int sony_td4353_jdi_prepare(struct drm_panel *panel)
> +{
> +	struct sony_td4353_jdi *ctx = to_sony_td4353_jdi(panel);
> +	struct device *dev = &ctx->dsi->dev;
> +	int ret;
> +
> +	if (ctx->prepared)
> +		return 0;
> +
> +	ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
> +	if (ret < 0) {
> +		dev_err(dev, "Failed to enable regulators: %d\n", ret);
> +		return ret;
> +	}
> +
> +	msleep(100);
> +
> +	gpiod_set_value_cansleep(ctx->treset_gpio, 1);
> +	gpiod_set_value_cansleep(ctx->preset_gpio, 1);
> +	usleep_range(5000, 5100);
> +
> +	ret = sony_td4353_jdi_on(ctx);
> +	if (ret < 0) {
> +		dev_err(dev, "Failed to power on panel: %d\n", ret);
> +		gpiod_set_value_cansleep(ctx->preset_gpio, 0);
> +		gpiod_set_value_cansleep(ctx->treset_gpio, 0);
> +		regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
The above sequence is almost the same as used in unprepare.
Maybe do it in a helper. Then the steps will also be the same - right
now treset is set to 0 either before or after power supplies are
disabled. The difference is confusing.

> +		return ret;
> +	}
> +
> +	ctx->prepared = true;
> +	return 0;
> +}
> +
> +static int sony_td4353_jdi_unprepare(struct drm_panel *panel)
> +{
> +	struct sony_td4353_jdi *ctx = to_sony_td4353_jdi(panel);
> +	struct device *dev = &ctx->dsi->dev;
> +	int ret;
> +
> +	if (!ctx->prepared)
> +		return 0;
> +
> +	ret = sony_td4353_jdi_off(ctx);
> +	if (ret < 0)
> +		dev_err(dev, "Failed to power off panel: %d\n", ret);
> +
> +	gpiod_set_value_cansleep(ctx->preset_gpio, 0);
> +	regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
> +
> +	gpiod_set_value_cansleep(ctx->treset_gpio, 0);
> +	usleep_range(5000, 5100);
> +
> +	ctx->prepared = false;
> +	return 0;
> +}
> +
> +static const struct drm_display_mode sony_td4353_jdi_mode_akari_60hz = {
> +	.clock = (1080 + 4 + 8 + 8) * (2160 + 259 + 8 + 8) * 60 / 1000,
> +	.hdisplay = 1080,
> +	.hsync_start = 1080 + 4,
> +	.hsync_end = 1080 + 4 + 8,
> +	.htotal = 1080 + 4 + 8 + 8,
> +	.vdisplay = 2160,
> +	.vsync_start = 2160 + 259,
> +	.vsync_end = 2160 + 259 + 8,
> +	.vtotal = 2160 + 259 + 8 + 8,
> +	.width_mm = 64,
> +	.height_mm = 128,
> +};
> +
> +static const struct drm_display_mode sony_td4353_jdi_mode_apollo_60hz = {
> +	.clock = (1080 + 4 + 8 + 8) * (2160 + 259 + 8 + 8) * 60 / 1000,
> +	.hdisplay = 1080,
> +	.hsync_start = 1080 + 4,
> +	.hsync_end = 1080 + 4 + 8,
> +	.htotal = 1080 + 4 + 8 + 8,
> +	.vdisplay = 2160,
> +	.vsync_start = 2160 + 259,
> +	.vsync_end = 2160 + 259 + 8,
> +	.vtotal = 2160 + 259 + 8 + 8,
> +	.width_mm = 56,
> +	.height_mm = 112,
> +};
> +
> +static int sony_td4353_jdi_get_modes(struct drm_panel *panel,
> +				   struct drm_connector *connector)
> +{
> +	struct sony_td4353_jdi *ctx = to_sony_td4353_jdi(panel);
> +	struct drm_display_mode *mode = NULL;
> +
> +	if (ctx->type == TYPE_AKARI_60HZ)
> +		mode = drm_mode_duplicate(connector->dev, &sony_td4353_jdi_mode_akari_60hz);
> +	else if (ctx->type == TYPE_APOLLO_60HZ)
> +		mode = drm_mode_duplicate(connector->dev, &sony_td4353_jdi_mode_apollo_60hz);
> +	else
> +		return -EINVAL;
> +
> +	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 sony_td4353_jdi_panel_funcs = {
> +	.prepare = sony_td4353_jdi_prepare,
> +	.unprepare = sony_td4353_jdi_unprepare,
> +	.get_modes = sony_td4353_jdi_get_modes,
> +};
> +
> +static int sony_td4353_jdi_probe(struct mipi_dsi_device *dsi)
> +{
> +	struct device *dev = &dsi->dev;
> +	struct sony_td4353_jdi *ctx;
> +	int ret;
> +
> +	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
> +	if (!ctx)
> +		return -ENOMEM;
> +
> +	ctx->type = (uintptr_t)of_device_get_match_data(dev);
> +
> +	ctx->supplies[0].supply = "vddio";
> +	ctx->supplies[1].supply = "vsp";
> +	ctx->supplies[2].supply = "vsn";
> +	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ctx->supplies),
> +				      ctx->supplies);
> +	if (ret < 0)
> +		return dev_err_probe(dev, ret, "Failed to get regulators\n");
> +
> +	ctx->preset_gpio = devm_gpiod_get(dev, "preset", GPIOD_ASIS);
> +	if (IS_ERR(ctx->preset_gpio))
> +		return dev_err_probe(dev, PTR_ERR(ctx->preset_gpio),
> +				     "Failed to get preset-gpios\n");
> +
> +	ctx->treset_gpio = devm_gpiod_get(dev, "treset", GPIOD_ASIS);
> +	if (IS_ERR(ctx->treset_gpio))
> +		return dev_err_probe(dev, PTR_ERR(ctx->treset_gpio),
> +				     "Failed to get treset-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_CLOCK_NON_CONTINUOUS;
> +
> +	drm_panel_init(&ctx->panel, dev, &sony_td4353_jdi_panel_funcs,
> +		       DRM_MODE_CONNECTOR_DSI);
> +
> +	ret = drm_panel_of_backlight(&ctx->panel);
> +	if (ret)
> +		return dev_err_probe(dev, ret, "Failed to get 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 int sony_td4353_jdi_remove(struct mipi_dsi_device *dsi)
In latest drm-misc-next tree this function returns a void - and this
needs to be adjusted accordingly.

> +{
> +	struct sony_td4353_jdi *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);
> +
> +	return 0;
> +}
> +
> +static const struct of_device_id sony_td4353_jdi_of_match[] = {
> +	{ .compatible = "sony,td4353-jdi-akari", .data = (void *)TYPE_AKARI_60HZ },
> +	{ .compatible = "sony,td4353-jdi-apollo", .data = (void *)TYPE_APOLLO_60HZ },
> +	{ /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, sony_td4353_jdi_of_match);
> +
> +static struct mipi_dsi_driver sony_td4353_jdi_driver = {
> +	.probe = sony_td4353_jdi_probe,
> +	.remove = sony_td4353_jdi_remove,
> +	.driver = {
> +		.name = "panel-sony-td4353-jdi",
> +		.of_match_table = sony_td4353_jdi_of_match,
> +	},
> +};
> +module_mipi_dsi_driver(sony_td4353_jdi_driver);
> +
> +MODULE_AUTHOR("Konrad Dybcio <konrad.dybcio@somainline.org>");
> +MODULE_DESCRIPTION("DRM panel driver for SONY Xperia XZ2/XZ2c JDI panel");
> +MODULE_LICENSE("GPL v2");
> -- 
> 2.37.0