Commit 530b1969 authored by Guido Günther's avatar Guido Günther Committed by Thierry Reding
Browse files

drm/panel: Add Rocktech jh057n00900 panel driver 



Support Rocktech jh057n00900 5.5" 720x1440 TFT LCD panel. It is a MIPI
DSI video mode panel.

The panel seems to use a Sitronix ST7703 look alike (most of the
commands look similar to the ST7703's data sheet but use a different
number of parameters). The initial version of the DSI init sequence
(including sleeps) were provided by the vendor. Sleeps were reduced
considerably though to speed up initialization.

Signed-off-by: default avatarGuido Günther <agx@sigxcpu.org>
Reviewed-by: default avatarSam Ravnborg <sam@ravnborg.org>
Signed-off-by: default avatarThierry Reding <treding@nvidia.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1a9ce687be283c66dfb26d1dfb52a7bf695090fa.1554114302.git.agx@sigxcpu.org
parent 89c30fcb

MAINTAINERS

+6 −0
Original line number Diff line number Diff line
@@ -4919,6 +4919,12 @@ S: Orphan / Obsolete 
F:	drivers/gpu/drm/r128/

F:	include/uapi/drm/r128_drm.h



DRM DRIVER FOR ROCKTECH JH057N00900 PANELS

M:	Guido Günther <agx@sigxcpu.org>

S:	Maintained

F:	drivers/gpu/drm/panel/panel-rocktech-jh057n00900.c

F:	Documentation/devicetree/bindings/display/panel/rocktech,jh057n00900.txt



DRM DRIVER FOR SAVAGE VIDEO CARDS

S:	Orphan / Obsolete

F:	drivers/gpu/drm/savage/

drivers/gpu/drm/panel/Kconfig

+13 −0
Original line number Diff line number Diff line
@@ -158,6 +158,19 @@ config DRM_PANEL_RAYDIUM_RM68200 
	  Say Y here if you want to enable support for Raydium RM68200

	  720x1280 DSI video mode panel.



config DRM_PANEL_ROCKTECH_JH057N00900

	tristate "Rocktech JH057N00900 MIPI touchscreen panel"

	depends on OF

	depends on DRM_MIPI_DSI

	depends on BACKLIGHT_CLASS_DEVICE

	help

	  Say Y here if you want to enable support for Rocktech JH057N00900

	  MIPI DSI panel as e.g. used in the Librem 5 devkit. It has a

	  resolution of 720x1440 pixels, a built in backlight and touch

	  controller.

	  Touch input support is provided by the goodix driver and needs to be

	  selected separately.



config DRM_PANEL_RONBO_RB070D30

	tristate "Ronbo Electronics RB070D30 panel"

	depends on OF

drivers/gpu/drm/panel/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -14,6 +14,7 @@ obj-$(CONFIG_DRM_PANEL_ORISETECH_OTM8009A) += panel-orisetech-otm8009a.o 
obj-$(CONFIG_DRM_PANEL_PANASONIC_VVX10F034N00) += panel-panasonic-vvx10f034n00.o

obj-$(CONFIG_DRM_PANEL_RASPBERRYPI_TOUCHSCREEN) += panel-raspberrypi-touchscreen.o

obj-$(CONFIG_DRM_PANEL_RAYDIUM_RM68200) += panel-raydium-rm68200.o

obj-$(CONFIG_DRM_PANEL_ROCKTECH_JH057N00900) += panel-rocktech-jh057n00900.o

obj-$(CONFIG_DRM_PANEL_RONBO_RB070D30) += panel-ronbo-rb070d30.o

obj-$(CONFIG_DRM_PANEL_SAMSUNG_LD9040) += panel-samsung-ld9040.o

obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6D16D0) += panel-samsung-s6d16d0.o

drivers/gpu/drm/panel/panel-rocktech-jh057n00900.c

0 → 100644
+386 −0
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// SPDX-License-Identifier: GPL-2.0

/*

 * Rockteck jh057n00900 5.5" MIPI-DSI panel driver

 *

 * Copyright (C) Purism SPC 2019

 */



#include <drm/drm_mipi_dsi.h>

#include <drm/drm_modes.h>

#include <drm/drm_panel.h>

#include <drm/drm_print.h>

#include <linux/backlight.h>

#include <linux/debugfs.h>

#include <linux/delay.h>

#include <linux/gpio/consumer.h>

#include <linux/media-bus-format.h>

#include <linux/module.h>

#include <video/display_timing.h>

#include <video/mipi_display.h>



#define DRV_NAME "panel-rocktech-jh057n00900"



/* Manufacturer specific Commands send via DSI */

#define ST7703_CMD_ALL_PIXEL_OFF 0x22

#define ST7703_CMD_ALL_PIXEL_ON	 0x23

#define ST7703_CMD_SETDISP	 0xB2

#define ST7703_CMD_SETRGBIF	 0xB3

#define ST7703_CMD_SETCYC	 0xB4

#define ST7703_CMD_SETBGP	 0xB5

#define ST7703_CMD_SETVCOM	 0xB6

#define ST7703_CMD_SETOTP	 0xB7

#define ST7703_CMD_SETPOWER_EXT	 0xB8

#define ST7703_CMD_SETEXTC	 0xB9

#define ST7703_CMD_SETMIPI	 0xBA

#define ST7703_CMD_SETVDC	 0xBC

#define ST7703_CMD_SETSCR	 0xC0

#define ST7703_CMD_SETPOWER	 0xC1

#define ST7703_CMD_SETPANEL	 0xCC

#define ST7703_CMD_SETGAMMA	 0xE0

#define ST7703_CMD_SETEQ	 0xE3

#define ST7703_CMD_SETGIP1	 0xE9

#define ST7703_CMD_SETGIP2	 0xEA



struct jh057n {

	struct device *dev;

	struct drm_panel panel;

	struct gpio_desc *reset_gpio;

	struct backlight_device *backlight;

	bool prepared;



	struct dentry *debugfs;

};



static inline struct jh057n *panel_to_jh057n(struct drm_panel *panel)

{

	return container_of(panel, struct jh057n, panel);

}



#define dsi_generic_write_seq(dsi, seq...) do {				\

		static const u8 d[] = { seq };				\

		int ret;						\

		ret = mipi_dsi_generic_write(dsi, d, ARRAY_SIZE(d));	\

		if (ret < 0)						\

			return ret;					\

	} while (0)



static int jh057n_init_sequence(struct jh057n *ctx)

{

	struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);

	struct device *dev = ctx->dev;

	int ret;



	/*

	 * Init sequence was supplied by the panel vendor. Most of the commands

	 * resemble the ST7703 but the number of parameters often don't match

	 * so it's likely a clone.

	 */

	dsi_generic_write_seq(dsi, ST7703_CMD_SETEXTC,

			      0xF1, 0x12, 0x83);

	dsi_generic_write_seq(dsi, ST7703_CMD_SETRGBIF,

			      0x10, 0x10, 0x05, 0x05, 0x03, 0xFF, 0x00, 0x00,

			      0x00, 0x00);

	dsi_generic_write_seq(dsi, ST7703_CMD_SETSCR,

			      0x73, 0x73, 0x50, 0x50, 0x00, 0x00, 0x08, 0x70,

			      0x00);

	dsi_generic_write_seq(dsi, ST7703_CMD_SETVDC, 0x4E);

	dsi_generic_write_seq(dsi, ST7703_CMD_SETPANEL, 0x0B);

	dsi_generic_write_seq(dsi, ST7703_CMD_SETCYC, 0x80);

	dsi_generic_write_seq(dsi, ST7703_CMD_SETDISP, 0xF0, 0x12, 0x30);

	dsi_generic_write_seq(dsi, ST7703_CMD_SETEQ,

			      0x07, 0x07, 0x0B, 0x0B, 0x03, 0x0B, 0x00, 0x00,

			      0x00, 0x00, 0xFF, 0x00, 0xC0, 0x10);

	dsi_generic_write_seq(dsi, ST7703_CMD_SETBGP, 0x08, 0x08);

	msleep(20);



	dsi_generic_write_seq(dsi, ST7703_CMD_SETVCOM, 0x3F, 0x3F);

	dsi_generic_write_seq(dsi, 0xBF, 0x02, 0x11, 0x00);

	dsi_generic_write_seq(dsi, ST7703_CMD_SETGIP1,

			      0x82, 0x10, 0x06, 0x05, 0x9E, 0x0A, 0xA5, 0x12,

			      0x31, 0x23, 0x37, 0x83, 0x04, 0xBC, 0x27, 0x38,

			      0x0C, 0x00, 0x03, 0x00, 0x00, 0x00, 0x0C, 0x00,

			      0x03, 0x00, 0x00, 0x00, 0x75, 0x75, 0x31, 0x88,

			      0x88, 0x88, 0x88, 0x88, 0x88, 0x13, 0x88, 0x64,

			      0x64, 0x20, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88,

			      0x02, 0x88, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

			      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00);

	dsi_generic_write_seq(dsi, ST7703_CMD_SETGIP2,

			      0x02, 0x21, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

			      0x00, 0x00, 0x00, 0x00, 0x02, 0x46, 0x02, 0x88,

			      0x88, 0x88, 0x88, 0x88, 0x88, 0x64, 0x88, 0x13,

			      0x57, 0x13, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88,

			      0x75, 0x88, 0x23, 0x14, 0x00, 0x00, 0x02, 0x00,

			      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,

			      0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x30, 0x0A,

			      0xA5, 0x00, 0x00, 0x00, 0x00);

	dsi_generic_write_seq(dsi, ST7703_CMD_SETGAMMA,

			      0x00, 0x09, 0x0E, 0x29, 0x2D, 0x3C, 0x41, 0x37,

			      0x07, 0x0B, 0x0D, 0x10, 0x11, 0x0F, 0x10, 0x11,

			      0x18, 0x00, 0x09, 0x0E, 0x29, 0x2D, 0x3C, 0x41,

			      0x37, 0x07, 0x0B, 0x0D, 0x10, 0x11, 0x0F, 0x10,

			      0x11, 0x18);

	msleep(20);



	ret = mipi_dsi_dcs_exit_sleep_mode(dsi);

	if (ret < 0) {

		DRM_DEV_ERROR(dev, "Failed to exit sleep mode");

		return ret;

	}

	/* Panel is operational 120 msec after reset */

	msleep(60);

	ret = mipi_dsi_dcs_set_display_on(dsi);

	if (ret)

		return ret;



	DRM_DEV_DEBUG_DRIVER(dev, "Panel init sequence done");

	return 0;

}



static int jh057n_enable(struct drm_panel *panel)

{

	struct jh057n *ctx = panel_to_jh057n(panel);



	return backlight_enable(ctx->backlight);

}



static int jh057n_disable(struct drm_panel *panel)

{

	struct jh057n *ctx = panel_to_jh057n(panel);



	return backlight_disable(ctx->backlight);

}



static int jh057n_unprepare(struct drm_panel *panel)

{

	struct jh057n *ctx = panel_to_jh057n(panel);

	struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);



	if (!ctx->prepared)

		return 0;



	mipi_dsi_dcs_set_display_off(dsi);

	ctx->prepared = false;



	return 0;

}



static int jh057n_prepare(struct drm_panel *panel)

{

	struct jh057n *ctx = panel_to_jh057n(panel);

	int ret;



	if (ctx->prepared)

		return 0;



	DRM_DEV_DEBUG_DRIVER(ctx->dev, "Resetting the panel.");

	gpiod_set_value_cansleep(ctx->reset_gpio, 1);

	usleep_range(20, 40);

	gpiod_set_value_cansleep(ctx->reset_gpio, 0);

	msleep(20);



	ret = jh057n_init_sequence(ctx);

	if (ret < 0) {

		DRM_DEV_ERROR(ctx->dev, "Panel init sequence failed: %d", ret);

		return ret;

	}



	ctx->prepared = true;



	return 0;

}



static const struct drm_display_mode default_mode = {

	.hdisplay    = 720,

	.hsync_start = 720 + 90,

	.hsync_end   = 720 + 90 + 20,

	.htotal	     = 720 + 90 + 20 + 20,

	.vdisplay    = 1440,

	.vsync_start = 1440 + 20,

	.vsync_end   = 1440 + 20 + 4,

	.vtotal	     = 1440 + 20 + 4 + 12,

	.vrefresh    = 60,

	.clock	     = 75276,

	.flags	     = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,

	.width_mm    = 65,

	.height_mm   = 130,

};



static int jh057n_get_modes(struct drm_panel *panel)

{

	struct jh057n *ctx = panel_to_jh057n(panel);

	struct drm_display_mode *mode;



	mode = drm_mode_duplicate(panel->drm, &default_mode);

	if (!mode) {

		DRM_DEV_ERROR(ctx->dev, "Failed to add mode %ux%u@%u",

			      default_mode.hdisplay, default_mode.vdisplay,

			      default_mode.vrefresh);

		return -ENOMEM;

	}



	drm_mode_set_name(mode);



	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;

	panel->connector->display_info.width_mm = mode->width_mm;

	panel->connector->display_info.height_mm = mode->height_mm;

	drm_mode_probed_add(panel->connector, mode);



	return 1;

}



static const struct drm_panel_funcs jh057n_drm_funcs = {

	.disable   = jh057n_disable,

	.unprepare = jh057n_unprepare,

	.prepare   = jh057n_prepare,

	.enable	   = jh057n_enable,

	.get_modes = jh057n_get_modes,

};



static int allpixelson_set(void *data, u64 val)

{

	struct jh057n *ctx = data;

	struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);



	DRM_DEV_DEBUG_DRIVER(ctx->dev, "Setting all pixels on");

	dsi_generic_write_seq(dsi, ST7703_CMD_ALL_PIXEL_ON);

	msleep(val * 1000);

	/* Reset the panel to get video back */

	drm_panel_disable(&ctx->panel);

	drm_panel_unprepare(&ctx->panel);

	drm_panel_prepare(&ctx->panel);

	drm_panel_enable(&ctx->panel);



	return 0;

}



DEFINE_SIMPLE_ATTRIBUTE(allpixelson_fops, NULL,

			allpixelson_set, "%llu\n");



static int jh057n_debugfs_init(struct jh057n *ctx)

{

	struct dentry *f;



	ctx->debugfs = debugfs_create_dir(DRV_NAME, NULL);

	if (!ctx->debugfs)

		return -ENOMEM;



	f = debugfs_create_file("allpixelson", 0600,

				ctx->debugfs, ctx, &allpixelson_fops);

	if (!f)

		return -ENOMEM;



	return 0;

}



static void jh057n_debugfs_remove(struct jh057n *ctx)

{

	debugfs_remove_recursive(ctx->debugfs);

	ctx->debugfs = NULL;

}



static int jh057n_probe(struct mipi_dsi_device *dsi)

{

	struct device *dev = &dsi->dev;

	struct jh057n *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_LOW);

	if (IS_ERR(ctx->reset_gpio)) {

		DRM_DEV_ERROR(dev, "cannot get reset gpio");

		return PTR_ERR(ctx->reset_gpio);

	}



	mipi_dsi_set_drvdata(dsi, ctx);



	ctx->dev = dev;



	dsi->lanes = 4;

	dsi->format = MIPI_DSI_FMT_RGB888;

	dsi->mode_flags = MIPI_DSI_MODE_VIDEO |

		MIPI_DSI_MODE_VIDEO_BURST | MIPI_DSI_MODE_VIDEO_SYNC_PULSE;



	ctx->backlight = devm_of_find_backlight(dev);

	if (IS_ERR(ctx->backlight))

		return PTR_ERR(ctx->backlight);



	drm_panel_init(&ctx->panel);

	ctx->panel.dev = dev;

	ctx->panel.funcs = &jh057n_drm_funcs;



	drm_panel_add(&ctx->panel);



	ret = mipi_dsi_attach(dsi);

	if (ret < 0) {

		DRM_DEV_ERROR(dev, "mipi_dsi_attach failed. Is host ready?");

		drm_panel_remove(&ctx->panel);

		return ret;

	}



	DRM_DEV_INFO(dev, "%ux%u@%u %ubpp dsi %udl - ready",

		     default_mode.hdisplay, default_mode.vdisplay,

		     default_mode.vrefresh,

		     mipi_dsi_pixel_format_to_bpp(dsi->format), dsi->lanes);



	jh057n_debugfs_init(ctx);

	return 0;

}



static void jh057n_shutdown(struct mipi_dsi_device *dsi)

{

	struct jh057n *ctx = mipi_dsi_get_drvdata(dsi);

	int ret;



	ret = jh057n_unprepare(&ctx->panel);

	if (ret < 0)

		DRM_DEV_ERROR(&dsi->dev, "Failed to unprepare panel: %d\n",

			      ret);



	ret = jh057n_disable(&ctx->panel);

	if (ret < 0)

		DRM_DEV_ERROR(&dsi->dev, "Failed to disable panel: %d\n",

			      ret);

}



static int jh057n_remove(struct mipi_dsi_device *dsi)

{

	struct jh057n *ctx = mipi_dsi_get_drvdata(dsi);

	int ret;



	jh057n_shutdown(dsi);



	ret = mipi_dsi_detach(dsi);

	if (ret < 0)

		DRM_DEV_ERROR(&dsi->dev, "Failed to detach from DSI host: %d\n",

			      ret);



	drm_panel_remove(&ctx->panel);



	jh057n_debugfs_remove(ctx);



	return 0;

}



static const struct of_device_id jh057n_of_match[] = {

	{ .compatible = "rocktech,jh057n00900" },

	{ /* sentinel */ }

};

MODULE_DEVICE_TABLE(of, jh057n_of_match);



static struct mipi_dsi_driver jh057n_driver = {

	.probe	= jh057n_probe,

	.remove = jh057n_remove,

	.shutdown = jh057n_shutdown,

	.driver = {

		.name = DRV_NAME,

		.of_match_table = jh057n_of_match,

	},

};

module_mipi_dsi_driver(jh057n_driver);



MODULE_AUTHOR("Guido Günther <agx@sigxcpu.org>");

MODULE_DESCRIPTION("DRM driver for Rocktech JH057N00900 MIPI DSI panel");

MODULE_LICENSE("GPL v2");

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