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: Guido Günther <a...@sigxcpu.org>
Reviewed-by: Sam Ravnborg <s...@ravnborg.org>
---
 MAINTAINERS                                   |   6 +
 drivers/gpu/drm/panel/Kconfig                 |  13 +
 drivers/gpu/drm/panel/Makefile                |   1 +
 .../drm/panel/panel-rocktech-jh057n00900.c    | 386 ++++++++++++++++++
 4 files changed, 406 insertions(+)
 create mode 100644 drivers/gpu/drm/panel/panel-rocktech-jh057n00900.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 8f1f505920df..57968eabe844 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -4999,6 +4999,12 @@ S:       Orphan / Obsolete
 F:     drivers/gpu/drm/r128/
 F:     include/uapi/drm/r128_drm.h
 
+DRM DRIVER FOR ROCKTECH JH057N00900 PANELS
+M:     Guido Günther <a...@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/
diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index f53f817356db..645ceb5776a9 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -149,6 +149,19 @@ 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
diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
index 7834947a53b0..0e739bbc44b8 100644
--- a/drivers/gpu/drm/panel/Makefile
+++ b/drivers/gpu/drm/panel/Makefile
@@ -13,6 +13,7 @@ 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
diff --git a/drivers/gpu/drm/panel/panel-rocktech-jh057n00900.c 
b/drivers/gpu/drm/panel/panel-rocktech-jh057n00900.c
new file mode 100644
index 000000000000..158a6d548068
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-rocktech-jh057n00900.c
@@ -0,0 +1,386 @@
+// 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 <a...@sigxcpu.org>");
+MODULE_DESCRIPTION("DRM driver for Rocktech JH057N00900 MIPI DSI panel");
+MODULE_LICENSE("GPL v2");
-- 
2.20.1

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