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

> + *
> + * 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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