Re: [linux-sunxi] [PATCH v3 20/25] drm/panel: Add Techstar TS8550B MIPI-DSI LCD panel

Priit Laes
2018-10-26T16:22:19Z

On Fri, Oct 26, 2018 at 08:13:39PM +0530, Jagan Teki wrote:
> Techstar TS8550B MIPI DSI panel is 480x854, 2-lane MIPI DSI
> LCD panel. Add panel driver for it.
>
> Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
> Tested-by: Jagan Teki <jagan@amarulasolutions.com>
> ---
> Changes for v3:
> - new patch
> Changes for v2:
> - none
>
> drivers/gpu/drm/panel/Kconfig | 9 +
> drivers/gpu/drm/panel/Makefile | 1 +
> .../gpu/drm/panel/panel-techstar-ts8550b.c | 346 ++++++++++++++++++
> 3 files changed, 356 insertions(+)
> create mode 100644 drivers/gpu/drm/panel/panel-techstar-ts8550b.c
>
> diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
> index 20b88c275421..d0d4e60f5153 100644
> --- a/drivers/gpu/drm/panel/Kconfig
> +++ b/drivers/gpu/drm/panel/Kconfig
> @@ -195,4 +195,13 @@ config DRM_PANEL_SITRONIX_ST7789V
> Say Y here if you want to enable support for the Sitronix
> ST7789V controller for 240x320 LCD panels
>
> +config DRM_PANEL_TECHSTAR_TS8550B
> + tristate "Techstar TS8550B MIPI-DSI panel driver"
> + depends on OF
> + depends on DRM_MIPI_DSI
> + depends on BACKLIGHT_CLASS_DEVICE
> + help
> + Say Y if you want to enable support for panels based on the
> + Techstar TS8550B MIPI-DSI interface.
> +
> endmenu
> diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
> index 04696bb85218..88011f06edb8 100644
> --- a/drivers/gpu/drm/panel/Makefile
> +++ b/drivers/gpu/drm/panel/Makefile
> @@ -20,3 +20,4 @@ obj-$(CONFIG_DRM_PANEL_SEIKO_43WVF1G) += panel-seiko-43wvf1g.o
> obj-$(CONFIG_DRM_PANEL_SHARP_LQ101R1SX01) += panel-sharp-lq101r1sx01.o
> obj-$(CONFIG_DRM_PANEL_SHARP_LS043T1LE01) += panel-sharp-ls043t1le01.o
> obj-$(CONFIG_DRM_PANEL_SITRONIX_ST7789V) += panel-sitronix-st7789v.o
> +obj-$(CONFIG_DRM_PANEL_TECHSTAR_TS8550B) += panel-techstar-ts8550b.o
> diff --git a/drivers/gpu/drm/panel/panel-techstar-ts8550b.c b/drivers/gpu/drm/panel/panel-techstar-ts8550b.c
> new file mode 100644
> index 000000000000..8baca71595a7
> --- /dev/null
> +++ b/drivers/gpu/drm/panel/panel-techstar-ts8550b.c
> @@ -0,0 +1,346 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright (C) 2019, Amarula Solutions.
> + * Author: Jagan Teki <jagan@amarulasolutions.com>
> + */
> +
> +#include <linux/backlight.h>
> +#include <linux/delay.h>
> +#include <linux/device.h>
> +#include <linux/err.h>
> +#include <linux/errno.h>
> +#include <linux/fb.h>
> +#include <linux/kernel.h>
> +#include <linux/module.h>
> +
> +#include <linux/gpio/consumer.h>
> +#include <linux/regulator/consumer.h>
> +
> +#include <drm/drm_mipi_dsi.h>
> +#include <drm/drm_modes.h>
> +#include <drm/drm_panel.h>
> +
> +#include <video/mipi_display.h>
> +
> +struct ts8550b {
> + struct drm_panel panel;
> + struct mipi_dsi_device *dsi;
> +
> + struct backlight_device *backlight;
> + struct regulator *dvdd;
> + struct regulator *avdd;
> + struct gpio_desc *reset;
> +
> + bool is_enabled;
> + bool is_prepared;
> +};
> +
> +static inline struct ts8550b *panel_to_ts8550b(struct drm_panel *panel)
> +{
> + return container_of(panel, struct ts8550b, panel);
> +}
> +
> +static inline int ts8550b_dcs_write_seq(struct ts8550b *ctx, const void *seq,
> + size_t len)
> +{
> + return mipi_dsi_dcs_write_buffer(ctx->dsi, seq, len);
> +};
> +
> +#define ts8550b_dcs_write_seq_static(ctx, seq...) \
> + ({ \
> + static const u8 d[] = { seq }; \
> + ts8550b_dcs_write_seq(ctx, d, ARRAY_SIZE(d)); \
> + })
> +
> +static void ts8550b_init_sequence(struct ts8550b *ctx)

This seems to be pretty "standard" MIPI-based display, utilizing
bunch of manufacturer-specific commands during init sequence.

Standard MIPI commands fall between 0x00..0xAF and are defined in <video/mipi.h>

> +{
> + ts8550b_dcs_write_seq_static(ctx, 0x01, 0x00);

MIPI_DCS_SOFT_RESET

> + msleep(200);
> + ts8550b_dcs_write_seq_static(ctx, 0xFF, 0x77, 0x01, 0x00, 0x00, 0x11);
> + ts8550b_dcs_write_seq_static(ctx, 0xD1, 0x11);
> + ts8550b_dcs_write_seq_static(ctx, 0x11, 0x00);

MIPI_DCS_EXIT_SLEEP_MODE

> + msleep(200);
> + ts8550b_dcs_write_seq_static(ctx, 0xFF, 0x77, 0x01, 0x00, 0x00, 0x10);
> + ts8550b_dcs_write_seq_static(ctx, 0xC0, 0xE9, 0x03);
> + ts8550b_dcs_write_seq_static(ctx, 0xC1, 0x12, 0x02);
> + ts8550b_dcs_write_seq_static(ctx, 0xC2, 0x07, 0x06);
> + ts8550b_dcs_write_seq_static(ctx, 0xB0, 0x00, 0x0E, 0x15, 0x0F, 0x11,
> + 0x08, 0x08, 0x08, 0x08, 0x23, 0x04, 0x13,
> + 0x12, 0x2B, 0x34, 0x1F);
> + ts8550b_dcs_write_seq_static(ctx, 0xB1, 0x00, 0x0E, 0x95, 0x0F, 0x13,
> + 0x07, 0x09, 0x08, 0x08, 0x22, 0x04, 0x10,
> + 0x0E, 0x2C, 0x34, 0x1F);
> + ts8550b_dcs_write_seq_static(ctx, 0xFF, 0x77, 0x01, 0x00, 0x00, 0x11);
> + ts8550b_dcs_write_seq_static(ctx, 0xB0, 0x45);
> + ts8550b_dcs_write_seq_static(ctx, 0xB1, 0x13);
> + ts8550b_dcs_write_seq_static(ctx, 0xB2, 0x07);
> + ts8550b_dcs_write_seq_static(ctx, 0xB3, 0x80);
> + ts8550b_dcs_write_seq_static(ctx, 0xB5, 0x47);
> + ts8550b_dcs_write_seq_static(ctx, 0xB7, 0x85);
> + ts8550b_dcs_write_seq_static(ctx, 0xB8, 0x20);
> + ts8550b_dcs_write_seq_static(ctx, 0xB9, 0x11);
> + ts8550b_dcs_write_seq_static(ctx, 0xC1, 0x78);
> + ts8550b_dcs_write_seq_static(ctx, 0xC2, 0x78);
> + ts8550b_dcs_write_seq_static(ctx, 0xD0, 0x88);
> + msleep(100);
> + ts8550b_dcs_write_seq_static(ctx, 0xE0, 0x00, 0x00, 0x02);
> + ts8550b_dcs_write_seq_static(ctx, 0xE1, 0x0B, 0x00, 0x0D, 0x00, 0x0C,
> + 0x00, 0x0E, 0x00, 0x00, 0x44, 0x44);
> + ts8550b_dcs_write_seq_static(ctx, 0xE2, 0x33, 0x33, 0x44, 0x44, 0x64,
> + 0x00, 0x66, 0x00, 0x65, 0x00, 0x67, 0x00,
> + 0x00);
> + ts8550b_dcs_write_seq_static(ctx, 0xE3, 0x00, 0x00, 0x33, 0x33);
> + ts8550b_dcs_write_seq_static(ctx, 0xE4, 0x44, 0x44);
> + ts8550b_dcs_write_seq_static(ctx, 0xE5, 0x0C, 0x78, 0x3C, 0xA0, 0x0E,
> + 0x78, 0x3C, 0xA0, 0x10, 0x78, 0x3C, 0xA0,
> + 0x12, 0x78, 0x3C, 0xA0);
> + ts8550b_dcs_write_seq_static(ctx, 0xE6, 0x00, 0x00, 0x33, 0x33);
> + ts8550b_dcs_write_seq_static(ctx, 0xE7, 0x44, 0x44);
> + ts8550b_dcs_write_seq_static(ctx, 0xE8, 0x0D, 0x78, 0x3C, 0xA0, 0x0F,
> + 0x78, 0x3C, 0xA0, 0x11, 0x78, 0x3C, 0xA0,
> + 0x13, 0x78, 0x3C, 0xA0);
> + ts8550b_dcs_write_seq_static(ctx, 0xEB, 0x02, 0x02, 0x39, 0x39, 0xEE,
> + 0x44, 0x00);
> + ts8550b_dcs_write_seq_static(ctx, 0xEC, 0x00, 0x00);
> + ts8550b_dcs_write_seq_static(ctx, 0xED, 0xFF, 0xF1, 0x04, 0x56, 0x72,
> + 0x3F, 0xFF, 0xFF, 0xFF, 0xFF, 0xF3, 0x27,
> + 0x65, 0x40, 0x1F, 0xFF);
> + ts8550b_dcs_write_seq_static(ctx, 0xFF, 0x77, 0x01, 0x00, 0x00, 0x00);
> + msleep(10);
> + ts8550b_dcs_write_seq_static(ctx, 0x29, 0x00);

MIPI_DCS_SET_DISPLAY_ON

> + msleep(200);
> +}
> +
> +static int ts8550b_prepare(struct drm_panel *panel)
> +{
> + struct ts8550b *ctx = panel_to_ts8550b(panel);
> + int ret;
> +
> + if (ctx->is_prepared)
> + return 0;
> +
> + gpiod_set_value(ctx->reset, 0);
> + msleep(20);
> +
> + ret = regulator_enable(ctx->dvdd);
> + if (ret)
> + return ret;
> + msleep(20);
> +
> + ret = regulator_enable(ctx->avdd);
> + if (ret)
> + return ret;
> + msleep(20);
> +
> + gpiod_set_value(ctx->reset, 1);
> + msleep(20);
> +
> + gpiod_set_value(ctx->reset, 0);
> + msleep(30);
> +
> + gpiod_set_value(ctx->reset, 1);
> + msleep(150);
> +
> + ts8550b_init_sequence(ctx);
> +
> + ctx->is_prepared = true;
> +
> + return 0;
> +}
> +
> +static int ts8550b_enable(struct drm_panel *panel)
> +{
> + struct ts8550b *ctx = panel_to_ts8550b(panel);
> +
> + if (ctx->is_enabled)
> + return 0;
> +
> + msleep(120);
> +
> + backlight_enable(ctx->backlight);
> + ctx->is_enabled = true;
> +
> + return 0;
> +}
> +
> +static int ts8550b_disable(struct drm_panel *panel)
> +{
> + struct ts8550b *ctx = panel_to_ts8550b(panel);
> +
> + if (!ctx->is_enabled)
> + return 0;
> +
> + backlight_disable(ctx->backlight);
> + ctx->is_enabled = false;
> +
> + return 0;
> +}
> +
> +static int ts8550b_unprepare(struct drm_panel *panel)
> +{
> + struct ts8550b *ctx = panel_to_ts8550b(panel);
> + int ret;
> +
> + if (!ctx->is_prepared)
> + return 0;
> +
> + ret = mipi_dsi_dcs_set_display_off(ctx->dsi);
> + if (ret < 0)
> + dev_err(panel->dev, "failed to set display off: %d\n", ret);
> +
> + ret = mipi_dsi_dcs_enter_sleep_mode(ctx->dsi);
> + if (ret < 0)
> + dev_err(panel->dev, "failed to enter sleep mode: %d\n", ret);
> +
> + msleep(120);
> +
> + regulator_disable(ctx->dvdd);
> +
> + regulator_disable(ctx->avdd);
> +
> + gpiod_set_value(ctx->reset, 0);
> +
> + gpiod_set_value(ctx->reset, 1);
> +
> + gpiod_set_value(ctx->reset, 0);
> +
> + ctx->is_prepared = false;
> +
> + return 0;
> +}
> +
> +static const struct drm_display_mode default_mode = {
> + .clock = 27500,
> + .vrefresh = 60,
> +
> + .hdisplay = 480,
> + .hsync_start = 480 + 38,
> + .hsync_end = 480 + 38 + 12,
> + .htotal = 480 + 38 + 12 + 12,
> +
> + .vdisplay = 854,
> + .vsync_start = 854 + 18,
> + .vsync_end = 854 + 18 + 8,
> + .vtotal = 854 + 18 + 8 + 4,
> +};
> +
> +static int ts8550b_get_modes(struct drm_panel *panel)
> +{
> + struct drm_connector *connector = panel->connector;
> + struct ts8550b *ctx = panel_to_ts8550b(panel);
> + struct drm_display_mode *mode;
> +
> + mode = drm_mode_duplicate(panel->drm, &default_mode);
> + if (!mode) {
> + dev_err(&ctx->dsi->dev, "failed to add mode %ux%ux@%u\n",
> + 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;
> + drm_mode_probed_add(connector, mode);
> +
> + panel->connector->display_info.width_mm = 69;
> + panel->connector->display_info.height_mm = 139;
> +
> + return 1;
> +}
> +
> +static const struct drm_panel_funcs ts8550b_funcs = {
> + .disable = ts8550b_disable,
> + .unprepare = ts8550b_unprepare,
> + .prepare = ts8550b_prepare,
> + .enable = ts8550b_enable,
> + .get_modes = ts8550b_get_modes,
> +};
> +
> +static int ts8550b_dsi_probe(struct mipi_dsi_device *dsi)
> +{
> + struct device_node *np;
> + struct ts8550b *ctx;
> + int ret;
> +
> + ctx = devm_kzalloc(&dsi->dev, sizeof(*ctx), GFP_KERNEL);
> + if (!ctx)
> + return -ENOMEM;
> +
> + mipi_dsi_set_drvdata(dsi, ctx);
> + ctx->dsi = dsi;
> +
> + drm_panel_init(&ctx->panel);
> + ctx->panel.dev = &dsi->dev;
> + ctx->panel.funcs = &ts8550b_funcs;
> +
> + ctx->dvdd = devm_regulator_get(&dsi->dev, "dvdd");
> + if (IS_ERR(ctx->dvdd)) {
> + dev_err(&dsi->dev, "Couldn't get dvdd regulator\n");
> + return PTR_ERR(ctx->dvdd);
> + }
> +
> + ctx->avdd = devm_regulator_get(&dsi->dev, "avdd");
> + if (IS_ERR(ctx->avdd)) {
> + dev_err(&dsi->dev, "Couldn't get avdd regulator\n");
> + return PTR_ERR(ctx->avdd);
> + }
> +
> + ctx->reset = devm_gpiod_get(&dsi->dev, "reset", GPIOD_OUT_LOW);
> + if (IS_ERR(ctx->reset)) {
> + dev_err(&dsi->dev, "Couldn't get our reset GPIO\n");
> + return PTR_ERR(ctx->reset);
> + }
> +
> + np = of_parse_phandle(dsi->dev.of_node, "backlight", 0);
> + if (np) {
> + ctx->backlight = of_find_backlight_by_node(np);
> + of_node_put(np);
> +
> + if (!ctx->backlight)
> + return -EPROBE_DEFER;
> + }
> +
> + ret = drm_panel_add(&ctx->panel);
> + if (ret < 0)
> + return ret;
> +
> + dsi->mode_flags = MIPI_DSI_MODE_VIDEO;
> + dsi->format = MIPI_DSI_FMT_RGB888;
> + dsi->lanes = 2;
> +
> + return mipi_dsi_attach(dsi);
> +}
> +
> +static int ts8550b_dsi_remove(struct mipi_dsi_device *dsi)
> +{
> + struct ts8550b *ctx = mipi_dsi_get_drvdata(dsi);
> +
> + mipi_dsi_detach(dsi);
> + drm_panel_remove(&ctx->panel);
> +
> + if (ctx->backlight)
> + put_device(&ctx->backlight->dev);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id ts8550b_of_match[] = {
> + { .compatible = "techstar,ts8550b" },
> + { }
> +};
> +MODULE_DEVICE_TABLE(of, ts8550b_of_match);
> +
> +static struct mipi_dsi_driver ts8550b_dsi_driver = {
> + .probe = ts8550b_dsi_probe,
> + .remove = ts8550b_dsi_remove,
> + .driver = {
> + .name = "techstar-ts8550b",
> + .of_match_table = ts8550b_of_match,
> + },
> +};
> +module_mipi_dsi_driver(ts8550b_dsi_driver);
> +
> +MODULE_AUTHOR("Jagan Teki <jagan@amarulasolutions.com>");
> +MODULE_DESCRIPTION("Techstar TS8550B MIPI-DSI LCD Panel Driver");
> +MODULE_LICENSE("GPL v2");
> --
> 2.18.0.321.gffc6fa0e3
>
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