Re: [PATCH 3/5] drm: panel: add Xingbangda XBD599 panel

[Icenowy Zheng <icenowy@aosc.io>]

于 2020年3月14日 GMT+08:00 下午4:00:00, Sam Ravnborg <sam@ravnborg.org> 写到:
>Hi Icenowy
>
>A few details in the following.
>
>	Sam
>
>On Thu, Mar 12, 2020 at 12:33:27AM +0800, Icenowy Zheng wrote:
>> Xingbangda XBD599 is a 5.99" 720x1440 MIPI-DSI IPS LCD panel made by
>> Xingbangda, which is used on PinePhone final assembled phones.
>> 
>> Add support for it.
>> 
>> Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
>> ---
>>  drivers/gpu/drm/panel/Kconfig                 |   9 +
>>  drivers/gpu/drm/panel/Makefile                |   1 +
>>  .../gpu/drm/panel/panel-xingbangda-xbd599.c   | 367
>++++++++++++++++++
>>  3 files changed, 377 insertions(+)
>>  create mode 100644 drivers/gpu/drm/panel/panel-xingbangda-xbd599.c
>> 
>> +++ b/drivers/gpu/drm/panel/panel-xingbangda-xbd599.c
>> @@ -0,0 +1,367 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/*
>> + * Xingbangda XBD599 MIPI-DSI panel driver
>> + *
>> + * Copyright (C) 2019 Icenowy Zheng <icenowy@aosc.io>
>2020?

The work started at Mid 2019.

Is 2019-2020 okay?

>
>> + *
>> + * Based on panel-rocktech-jh057n00900.c, which is:
>> + *   Copyright (C) Purism SPC 2019
>> + */
>> +
>> +#include <linux/gpio/consumer.h>
>> +#include <linux/delay.h>
>> +#include <linux/mod_devicetable.h>
>> +#include <linux/module.h>
>> +#include <linux/of_device.h>
>> +#include <linux/regulator/consumer.h>
>Sort alphabetically.
>
>> +
>> +#include <drm/drm_mipi_dsi.h>
>> +#include <drm/drm_modes.h>
>> +#include <drm/drm_panel.h>
>> +#include <drm/drm_print.h>
>> +
>> +#define DRV_NAME "panel-xingbangda-xbd599"
>No reason for this indirection, it is only used once
>
>> +
>> +/* 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_UNK_C6	 0xC6
>> +#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
>> +
>> +static const char * const regulator_names[] = {
>> +	"iovcc",
>> +	"vcc",
>> +};
>> +
>> +struct xbd599 {
>> +	struct device *dev;
>> +	struct drm_panel panel;
>> +	struct gpio_desc *reset_gpio;
>> +	struct regulator_bulk_data supplies[ARRAY_SIZE(regulator_names)];
>> +	bool prepared;
>> +};
>> +
>> +static inline struct xbd599 *panel_to_xbd599(struct drm_panel
>*panel)
>> +{
>> +	return container_of(panel, struct xbd599, panel);
>> +}
>> +
>> +#define dsi_dcs_write_seq(dsi, cmd, seq...) do {			\
>> +		static const u8 d[] = { seq };				\
>> +		int ret;						\
>> +		ret = mipi_dsi_dcs_write(dsi, cmd, d, ARRAY_SIZE(d));	\
>> +		if (ret < 0)						\
>> +			return ret;					\
>> +	} while (0)
>> +
>> +static int xbd599_init_sequence(struct xbd599 *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.
>> +	 */
>> +	dsi_dcs_write_seq(dsi, ST7703_CMD_SETEXTC,
>> +			  0xF1, 0x12, 0x83);
>> +	dsi_dcs_write_seq(dsi, ST7703_CMD_SETMIPI,
>> +			  0x33, 0x81, 0x05, 0xF9, 0x0E, 0x0E, 0x20, 0x00,
>> +			  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x44, 0x25,
>> +			  0x00, 0x91, 0x0a, 0x00, 0x00, 0x02, 0x4F, 0x11,
>> +			  0x00, 0x00, 0x37);
>> +	dsi_dcs_write_seq(dsi, ST7703_CMD_SETPOWER_EXT,
>> +			  0x25, 0x22, 0x20, 0x03);
>> +	dsi_dcs_write_seq(dsi, ST7703_CMD_SETRGBIF,
>> +			  0x10, 0x10, 0x05, 0x05, 0x03, 0xFF, 0x00, 0x00,
>> +			  0x00, 0x00);
>> +	dsi_dcs_write_seq(dsi, ST7703_CMD_SETSCR,
>> +			  0x73, 0x73, 0x50, 0x50, 0x00, 0xC0, 0x08, 0x70,
>> +			  0x00);
>> +	dsi_dcs_write_seq(dsi, ST7703_CMD_SETVDC, 0x4E);
>> +	dsi_dcs_write_seq(dsi, ST7703_CMD_SETPANEL, 0x0B);
>> +	dsi_dcs_write_seq(dsi, ST7703_CMD_SETCYC, 0x80);
>> +	dsi_dcs_write_seq(dsi, ST7703_CMD_SETDISP, 0xF0, 0x12, 0xF0);
>> +	dsi_dcs_write_seq(dsi, ST7703_CMD_SETEQ,
>> +			  0x00, 0x00, 0x0B, 0x0B, 0x10, 0x10, 0x00, 0x00,
>> +			  0x00, 0x00, 0xFF, 0x00, 0xC0, 0x10);
>> +	dsi_dcs_write_seq(dsi, 0xC6, 0x01, 0x00, 0xFF, 0xFF, 0x00);
>> +	dsi_dcs_write_seq(dsi, ST7703_CMD_SETPOWER,
>> +			  0x74, 0x00, 0x32, 0x32, 0x77, 0xF1, 0xFF, 0xFF,
>> +			  0xCC, 0xCC, 0x77, 0x77);
>> +	dsi_dcs_write_seq(dsi, ST7703_CMD_SETBGP, 0x07, 0x07);
>> +	dsi_dcs_write_seq(dsi, ST7703_CMD_SETVCOM, 0x2C, 0x2C);
>> +	dsi_dcs_write_seq(dsi, 0xBF, 0x02, 0x11, 0x00);
>> +
>> +	dsi_dcs_write_seq(dsi, ST7703_CMD_SETGIP1,
>> +			  0x82, 0x10, 0x06, 0x05, 0xA2, 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_dcs_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, 0x03, 0x0A,
>> +			  0xA5, 0x00, 0x00, 0x00, 0x00);
>> +	dsi_dcs_write_seq(dsi, ST7703_CMD_SETGAMMA,
>> +			  0x00, 0x09, 0x0D, 0x23, 0x27, 0x3C, 0x41, 0x35,
>> +			  0x07, 0x0D, 0x0E, 0x12, 0x13, 0x10, 0x12, 0x12,
>> +			  0x18, 0x00, 0x09, 0x0D, 0x23, 0x27, 0x3C, 0x41,
>> +			  0x35, 0x07, 0x0D, 0x0E, 0x12, 0x13, 0x10, 0x12,
>> +			  0x12, 0x18);
>> +	msleep(20);
>> +
>> +	ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
>> +	if (ret < 0) {
>> +		DRM_DEV_ERROR(dev, "Failed to exit sleep mode\n");
>> +		return ret;
>> +	}
>> +	msleep(250);
>> +
>> +	ret = mipi_dsi_dcs_set_display_on(dsi);
>> +	if (ret)
>> +		return ret;
>> +	msleep(50);
>> +
>> +	DRM_DEV_DEBUG_DRIVER(dev, "Panel init sequence done\n");
>> +	return 0;
>> +}
>> +
>> +static int xbd599_disable(struct drm_panel *panel)
>> +{
>> +	struct xbd599 *ctx = panel_to_xbd599(panel);
>> +	struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
>> +
>> +	return mipi_dsi_dcs_set_display_off(dsi);
>> +}
>The following is the same for many panels but anyway.
>
>The init order for a display is
>
>    prepare
>    enable
>
>    # Display is now fully operational
>
>    disable
>    unprepare
>
>    # display is now off and turned off (no power)
>
>So when reading panel drivers my personal preference is to read the
>functions in that order - this makes it easier to follow the sequence.
>
>Thats just my personal opinion - so feel free to ignore.
>
>> +
>> +static int xbd599_unprepare(struct drm_panel *panel)
>> +{
>> +	struct xbd599 *ctx = panel_to_xbd599(panel);
>> +
>> +	if (!ctx->prepared)
>> +		return 0;
>> +
>> +	regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
>> +	ctx->prepared = false;
>> +
>> +	return 0;
>> +}
>Maybe activate reset before power is turned off.
>So when power is turned on again later the panel is kept in reset.
>
>This would also make this a closer mirror of what is done in prepare()
>
>> +
>> +static int xbd599_enable(struct drm_panel *panel)
>> +{
>> +	struct xbd599 *ctx = panel_to_xbd599(panel);
>> +	int ret;
>> +
>> +	ret = xbd599_init_sequence(ctx);
>> +	if (ret < 0) {
>> +		DRM_DEV_ERROR(ctx->dev, "Panel init sequence failed: %d\n",
>> +			      ret);
>> +		return ret;
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +static int xbd599_prepare(struct drm_panel *panel)
>> +{
>> +	struct xbd599 *ctx = panel_to_xbd599(panel);
>> +	int ret;
>> +
>> +	if (ctx->prepared)
>> +		return 0;
>> +
>> +	ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies),
>ctx->supplies);
>> +	if (ret)
>> +		return ret;
>> +
>> +	DRM_DEV_DEBUG_DRIVER(ctx->dev, "Resetting the panel\n");
>> +	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
>> +	usleep_range(20, 40);
>> +	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
>> +	msleep(20);
>> +
>> +	ctx->prepared = true;
>> +
>> +	return 0;
>> +}
>> +
>> +static const struct drm_display_mode xbd599_default_mode = {
>> +	.hdisplay    = 720,
>> +	.hsync_start = 720 + 40,
>> +	.hsync_end   = 720 + 40 + 40,
>> +	.htotal	     = 720 + 40 + 40 + 40,
>> +	.vdisplay    = 1440,
>> +	.vsync_start = 1440 + 18,
>> +	.vsync_end   = 1440 + 18 + 10,
>> +	.vtotal	     = 1440 + 18 + 10 + 17,
>> +	.vrefresh    = 60,
>> +	.clock	     = 69000,
>> +	.flags	     = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
>> +
>> +	.width_mm    = 68,
>> +	.height_mm   = 136,
>> +	.type        = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
>> +};
>> +
>> +static int xbd599_get_modes(struct drm_panel *panel,
>> +			    struct drm_connector *connector)
>> +{
>> +	struct xbd599 *ctx = panel_to_xbd599(panel);
>> +	struct drm_display_mode *mode;
>> +
>> +	mode = drm_mode_duplicate(connector->dev, &xbd599_default_mode);
>> +	if (!mode) {
>> +		DRM_DEV_ERROR(ctx->dev, "Failed to add mode\n");
>> +		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 xbd599_drm_funcs = {
>> +	.disable   = xbd599_disable,
>> +	.unprepare = xbd599_unprepare,
>> +	.enable    = xbd599_enable,
>> +	.prepare   = xbd599_prepare,
>> +	.get_modes = xbd599_get_modes,
>> +};
>> +
>> +static int xbd599_probe(struct mipi_dsi_device *dsi)
>> +{
>> +	struct device *dev = &dsi->dev;
>> +	struct xbd599 *ctx;
>> +	int i, ret;
>> +
>> +	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
>> +	if (!ctx)
>> +		return -ENOMEM;
>> +
>> +	for (i = 0; i < ARRAY_SIZE(ctx->supplies); i++)
>> +		ctx->supplies[i].supply = regulator_names[i];
>> +
>> +	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ctx->supplies),
>> +				      ctx->supplies);
>> +	if (ret < 0) {
>> +		DRM_DEV_ERROR(&dsi->dev, "cannot get regulators\n");
>> +		return ret;
>> +	}
>> +
>> +	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\n");
>> +		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_SYNC_PULSE;
>> +
>> +	drm_panel_init(&ctx->panel, &dsi->dev, &xbd599_drm_funcs,
>> +		       DRM_MODE_CONNECTOR_DSI);
>> +
>> +	ret = drm_panel_of_backlight(&ctx->panel);
>> +	if (ret)
>> +		return ret;
>> +
>> +	drm_panel_add(&ctx->panel);
>> +
>> +	ret = mipi_dsi_attach(dsi);
>> +	if (ret < 0) {
>> +		DRM_DEV_ERROR(dev, "mipi_dsi_attach failed. Is host ready?\n");
>> +		drm_panel_remove(&ctx->panel);
>> +		return ret;
>> +	}
>> +
>> +	DRM_DEV_INFO(dev, "%ux%u@%u %ubpp dsi %udl - ready\n",
>> +		     xbd599_default_mode.hdisplay,
>> +		     xbd599_default_mode.vdisplay,
>> +		     xbd599_default_mode.vrefresh,
>> +		     mipi_dsi_pixel_format_to_bpp(dsi->format), dsi->lanes);
>> +
>> +	return 0;
>> +}
>> +
>> +static void xbd599_shutdown(struct mipi_dsi_device *dsi)
>> +{
>> +	struct xbd599 *ctx = mipi_dsi_get_drvdata(dsi);
>> +	int ret;
>> +
>> +	ret = xbd599_unprepare(&ctx->panel);
>
>Use drm_panel_unprepare().
>There may be, or may come functionality in drm_panel that is required.
>
>> +	if (ret < 0)
>> +		DRM_DEV_ERROR(&dsi->dev, "Failed to unprepare panel: %d\n",
>> +			      ret);
>> +}
>> +
>> +static int xbd599_remove(struct mipi_dsi_device *dsi)
>> +{
>> +	struct xbd599 *ctx = mipi_dsi_get_drvdata(dsi);
>> +	int ret;
>> +
>> +	xbd599_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);
>> +
>> +	return 0;
>> +}
>> +
>> +static const struct of_device_id xbd599_of_match[] = {
>> +	{ .compatible = "xingbangda,xbd599", },
>> +	{ /* sentinel */ }
>> +};
>> +MODULE_DEVICE_TABLE(of, xbd599_of_match);
>> +
>> +static struct mipi_dsi_driver xbd599_driver = {
>> +	.probe	= xbd599_probe,
>> +	.remove = xbd599_remove,
>> +	.shutdown = xbd599_shutdown,
>> +	.driver = {
>> +		.name = DRV_NAME,
>> +		.of_match_table = xbd599_of_match,
>> +	},
>> +};
>> +module_mipi_dsi_driver(xbd599_driver);
>> +
>> +MODULE_AUTHOR("Icenowy Zheng <icenowy@aosc.io>");
>> +MODULE_DESCRIPTION("DRM driver for Xingbangda XBD599 MIPI DSI
>panel");
>> +MODULE_LICENSE("GPL v2");
>> -- 
>> 2.24.1

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