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

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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