Message-ID: <yccnqb63gp5svx76rudfnphecpatkpwgp2wlfenojebulrigma@xfztf3ox6q7d>
Date: Mon, 15 Apr 2024 19:50:49 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: David Wronek <david@...nlining.org>
Cc: Neil Armstrong <neil.armstrong@...aro.org>, 
	Jessica Zhang <quic_jesszhan@...cinc.com>, Sam Ravnborg <sam@...nborg.org>, 
	David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>, 
	Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>, 
	Thomas Zimmermann <tzimmermann@...e.de>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Marijn Suijten <marijn.suijten@...ainline.org>, Konrad Dybcio <konradybcio@...nel.org>, 
	dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
	~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] drm/panel: Add driver for EDO RM69380 OLED panel

On Mon, Apr 15, 2024 at 06:10:42PM +0200, David Wronek wrote:
> Add support for the 2560x1600@...z OLED panel by EDO bundled with a
> Raydium RM69380 controller, as found on the Lenovo Xiaoxin Pad Pro 2021.
> 
> Signed-off-by: David Wronek <david@...nlining.org>
> ---
>  drivers/gpu/drm/panel/Kconfig                 |  14 +
>  drivers/gpu/drm/panel/Makefile                |   1 +
>  drivers/gpu/drm/panel/panel-raydium-rm69380.c | 366 ++++++++++++++++++++++++++
>  3 files changed, 381 insertions(+)
> 
> diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
> index 154f5bf82980..5b3eeb93b1a2 100644
> --- a/drivers/gpu/drm/panel/Kconfig
> +++ b/drivers/gpu/drm/panel/Kconfig
> @@ -542,6 +542,20 @@ config DRM_PANEL_RAYDIUM_RM692E5
>  	  Say Y here if you want to enable support for Raydium RM692E5-based
>  	  display panels, such as the one found in the Fairphone 5 smartphone.
>  
> +config DRM_PANEL_RAYDIUM_RM69380
> +	tristate "Raydium RM69380-based DSI panel"
> +	depends on BACKLIGHT_CLASS_DEVICE
> +	depends on DRM_DISPLAY_DP_HELPER
> +	depends on DRM_DISPLAY_HELPER
> +	depends on DRM_MIPI_DSI
> +	depends on OF
> +	help
> +	  Say Y here if you want to enable support for Raydium RM69380-based
> +	  display panels.
> +
> +	  This panel controller can be found in the Lenovo Xiaoxin Pad Pro 2021
> +	  in combination with an EDO OLED panel.
> +
>  config DRM_PANEL_RONBO_RB070D30
>  	tristate "Ronbo Electronics RB070D30 panel"
>  	depends on OF
> diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
> index 24a02655d726..e2a2807d4ef0 100644
> --- a/drivers/gpu/drm/panel/Makefile
> +++ b/drivers/gpu/drm/panel/Makefile
> @@ -55,6 +55,7 @@ obj-$(CONFIG_DRM_PANEL_RASPBERRYPI_TOUCHSCREEN) += panel-raspberrypi-touchscreen
>  obj-$(CONFIG_DRM_PANEL_RAYDIUM_RM67191) += panel-raydium-rm67191.o
>  obj-$(CONFIG_DRM_PANEL_RAYDIUM_RM68200) += panel-raydium-rm68200.o
>  obj-$(CONFIG_DRM_PANEL_RAYDIUM_RM692E5) += panel-raydium-rm692e5.o
> +obj-$(CONFIG_DRM_PANEL_RAYDIUM_RM69380) += panel-raydium-rm69380.o
>  obj-$(CONFIG_DRM_PANEL_RONBO_RB070D30) += panel-ronbo-rb070d30.o
>  obj-$(CONFIG_DRM_PANEL_SAMSUNG_ATNA33XC20) += panel-samsung-atna33xc20.o
>  obj-$(CONFIG_DRM_PANEL_SAMSUNG_DB7430) += panel-samsung-db7430.o
> diff --git a/drivers/gpu/drm/panel/panel-raydium-rm69380.c b/drivers/gpu/drm/panel/panel-raydium-rm69380.c
> new file mode 100644
> index 000000000000..253b9a1c2800
> --- /dev/null
> +++ b/drivers/gpu/drm/panel/panel-raydium-rm69380.c
> @@ -0,0 +1,366 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Generated with linux-mdss-dsi-panel-driver-generator from vendor device tree.
> + * Copyright (c) 2024 David Wronek <david@...nlining.org>
> + */
> +
> +#include <linux/backlight.h>
> +#include <linux/delay.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
> +#include <linux/of_graph.h>
> +#include <linux/regulator/consumer.h>
> +
> +#include <drm/drm_mipi_dsi.h>
> +#include <drm/drm_modes.h>
> +#include <drm/drm_panel.h>
> +#include <drm/drm_probe_helper.h>
> +
> +struct rm69380_panel {
> +	struct drm_panel panel;
> +	struct mipi_dsi_device *dsi[2];
> +	struct regulator_bulk_data supplies[2];
> +	struct gpio_desc *reset_gpio;
> +	bool prepared;
> +};
> +
> +static inline
> +struct rm69380_panel *to_rm69380_panel(struct drm_panel *panel)
> +{
> +	return container_of(panel, struct rm69380_panel, panel);
> +}
> +
> +static void rm69380_reset(struct rm69380_panel *ctx)
> +{
> +	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
> +	usleep_range(15000, 16000);
> +	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
> +	usleep_range(10000, 11000);
> +	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
> +	msleep(30);
> +}
> +
> +static int rm69380_on(struct rm69380_panel *ctx)
> +{
> +	struct mipi_dsi_device *dsi = ctx->dsi[0];
> +	struct device *dev = &dsi->dev;
> +	int ret;
> +
> +	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
> +	if (ctx->dsi[1])
> +		ctx->dsi[1]->mode_flags |= MIPI_DSI_MODE_LPM;
> +
> +	mipi_dsi_dcs_write_seq(dsi, 0xfe, 0xd4);
> +	mipi_dsi_dcs_write_seq(dsi, 0x00, 0x80);
> +	mipi_dsi_dcs_write_seq(dsi, 0xfe, 0xd0);
> +	mipi_dsi_dcs_write_seq(dsi, 0x48, 0x00);
> +	mipi_dsi_dcs_write_seq(dsi, 0xfe, 0x26);
> +	mipi_dsi_dcs_write_seq(dsi, 0x75, 0x3f);
> +	mipi_dsi_dcs_write_seq(dsi, 0x1d, 0x1a);
> +	mipi_dsi_dcs_write_seq(dsi, 0xfe, 0x00);
> +	mipi_dsi_dcs_write_seq(dsi, 0x53, 0x28);
> +	mipi_dsi_dcs_write_seq(dsi, 0xc2, 0x08);
> +	mipi_dsi_dcs_write_seq(dsi, 0x35, 0x00);

mipi_dsi_dcs_set_tear_on(dsi, MIPI_DSI_DCS_TEAR_MODE_VBLANK);

> +	mipi_dsi_dcs_write_seq(dsi, 0x51, 0x07, 0xff);

ret = mipi_dsi_dcs_set_display_brightness_large(dsi, 0x7ff);

> +
> +	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(20);
> +
> +	ret = mipi_dsi_dcs_set_display_on(dsi);
> +	if (ret < 0) {
> +		dev_err(dev, "Failed to set display on: %d\n", ret);
> +		return ret;
> +	}
> +	msleep(36);
> +
> +	return 0;
> +}

[skipped]

> +
> +static const struct drm_display_mode rm69380_mode = {
> +	.clock = (2560 + 32 + 12 + 38) * (1600 + 20 + 4 + 8) * 90 / 1000,
> +	.hdisplay = 2560,
> +	.hsync_start = 2560 + 32,
> +	.hsync_end = 2560 + 32 + 12,
> +	.htotal = 2560 + 32 + 12 + 38,
> +	.vdisplay = 1600,
> +	.vsync_start = 1600 + 20,
> +	.vsync_end = 1600 + 20 + 4,
> +	.vtotal = 1600 + 20 + 4 + 8,
> +	.width_mm = 248,
> +	.height_mm = 155,
> +	.type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,

Nit: DRM_MODE_TYPE_PREFERRED will be set by
drm_connector_helper_get_modes_fixed(), so it can be dropped here.

> +};
> +
> +static int rm69380_get_modes(struct drm_panel *panel,
> +					struct drm_connector *connector)
> +{
> +	return drm_connector_helper_get_modes_fixed(connector, &rm69380_mode);
> +}
> +
> +static const struct drm_panel_funcs rm69380_panel_funcs = {
> +	.prepare = rm69380_prepare,
> +	.unprepare = rm69380_unprepare,
> +	.get_modes = rm69380_get_modes,
> +};
> +
> +static int rm69380_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 rm69380_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);
> +	if (ret < 0)
> +		return ret;
> +
> +	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
> +
> +	return brightness;
> +}
> +
> +static const struct backlight_ops rm69380_bl_ops = {
> +	.update_status = rm69380_bl_update_status,
> +	.get_brightness = rm69380_bl_get_brightness,
> +};
> +
> +static struct backlight_device *
> +rm69380_create_backlight(struct mipi_dsi_device *dsi)
> +{
> +	struct device *dev = &dsi->dev;
> +	const struct backlight_properties props = {
> +		.type = BACKLIGHT_RAW,
> +		.brightness = 2047,
> +		.max_brightness = 2047,
> +	};
> +
> +	return devm_backlight_device_register(dev, dev_name(dev), dev, dsi,
> +					      &rm69380_bl_ops, &props);
> +}
> +
> +static int rm69380_probe(struct mipi_dsi_device *dsi)
> +{
> +	struct mipi_dsi_host *dsi_sec_host;
> +	struct rm69380_panel *ctx;
> +	struct device *dev = &dsi->dev;
> +	struct device_node *dsi_sec;
> +	int ret, i;
> +
> +	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
> +	if (!ctx)
> +		return -ENOMEM;
> +
> +	ctx->supplies[0].supply = "vddio";
> +	ctx->supplies[1].supply = "avdd";
> +	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->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");
> +
> +	dsi_sec = of_graph_get_remote_node(dsi->dev.of_node, 1, -1);
> +
> +	if (dsi_sec) {
> +		dev_dbg(dev, "Using Dual-DSI\n");
> +
> +		const struct mipi_dsi_device_info info = { "RM69380", 0,
> +							   dsi_sec };
> +
> +		dev_dbg(dev, "Found second DSI `%s`\n", dsi_sec->name);
> +
> +		dsi_sec_host = of_find_mipi_dsi_host_by_node(dsi_sec);
> +		of_node_put(dsi_sec);
> +		if (!dsi_sec_host) {
> +			return dev_err_probe(dev, -EPROBE_DEFER,
> +					     "Cannot get secondary DSI host\n");
> +		}
> +
> +		ctx->dsi[1] =
> +			mipi_dsi_device_register_full(dsi_sec_host, &info);

Either you should be using devm_mipi_dsi_device_register_full() here or
you should call mipi_dsi_device_unregister() in the error and remove
paths. I'd suggest the former.

> +		if (IS_ERR(ctx->dsi[1])) {
> +			return dev_err_probe(dev, PTR_ERR(ctx->dsi[1]),
> +					     "Cannot get secondary DSI node\n");
> +		}
> +
> +		dev_dbg(dev, "Second DSI name `%s`\n", ctx->dsi[1]->name);
> +		mipi_dsi_set_drvdata(ctx->dsi[1], ctx);
> +	} else {
> +		dev_dbg(dev, "Using Single-DSI\n");
> +	}
> +
> +	ctx->dsi[0] = dsi;
> +	mipi_dsi_set_drvdata(dsi, ctx);
> +
> +	drm_panel_init(&ctx->panel, dev, &rm69380_panel_funcs,
> +		       DRM_MODE_CONNECTOR_DSI);
> +	ctx->panel.prepare_prev_first = true;
> +
> +	ctx->panel.backlight = rm69380_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);
> +
> +	for (i = 0; i < ARRAY_SIZE(ctx->dsi); i++) {
> +		if (!ctx->dsi[i])
> +			continue;
> +
> +		dev_dbg(&ctx->dsi[i]->dev, "Binding DSI %d\n", i);
> +
> +		ctx->dsi[i]->lanes = 4;
> +		ctx->dsi[i]->format = MIPI_DSI_FMT_RGB888;
> +		ctx->dsi[i]->mode_flags = MIPI_DSI_MODE_VIDEO_BURST |
> +					  MIPI_DSI_CLOCK_NON_CONTINUOUS;
> +
> +		ret = mipi_dsi_attach(ctx->dsi[i]);
> +		if (ret < 0) {
> +			drm_panel_remove(&ctx->panel);
> +			return dev_err_probe(dev, ret,
> +					     "Failed to attach to DSI%d\n", i);
> +		}
> +	}
> +
> +	return 0;
> +}
> +
> +static void rm69380_remove(struct mipi_dsi_device *dsi)
> +{
> +	struct rm69380_panel *ctx = mipi_dsi_get_drvdata(dsi);
> +	int i;
> +	int ret;
> +
> +	for (i = 0; i < ARRAY_SIZE(ctx->dsi); i++) {
> +		if (!ctx->dsi[i])
> +			continue;
> +
> +		ret = mipi_dsi_detach(ctx->dsi[i]);
> +		if (ret < 0)
> +			dev_err(&dsi->dev, "Failed to detach from DSI%d host: %d\n", i, ret);
> +	}
> +
> +	drm_panel_remove(&ctx->panel);
> +}
> +
> +static const struct of_device_id rm69380_of_match[] = {
> +	{ .compatible = "lenovo,j716f-edo-rm69380" },
> +	{ /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, rm69380_of_match);
> +
> +static struct mipi_dsi_driver rm69380_panel_driver = {
> +	.probe = rm69380_probe,
> +	.remove = rm69380_remove,
> +	.driver = {
> +		.name = "panel-raydium-rm69380",
> +		.of_match_table = rm69380_of_match,
> +	},
> +};
> +module_mipi_dsi_driver(rm69380_panel_driver);
> +
> +MODULE_AUTHOR("David Wronek <david@...nlining.org");
> +MODULE_DESCRIPTION("DRM driver for Raydium RM69380-equipped DSI panels");
> +MODULE_LICENSE("GPL");
> 
> -- 
> 2.44.0
> 

-- 
With best wishes
Dmitry

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