UNI-T UTi260b has a Inanbo T28CP45TN89 v17 panel. I could not find
proper documentation for the panel apart from a technical drawing, but
according to the vendor U-Boot it is based on a Sitronix st7789v chip.
I generated the init sequence by modifying the default one until proper
graphics output has been seen on the device.

Reviewed-by: Michael Riesch <michael.rie...@wolfvision.net>
Signed-off-by: Sebastian Reichel <s...@kernel.org>
---
 .../gpu/drm/panel/panel-sitronix-st7789v.c    | 25 +++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/drivers/gpu/drm/panel/panel-sitronix-st7789v.c 
b/drivers/gpu/drm/panel/panel-sitronix-st7789v.c
index 94c805c79d05..55e475471f43 100644
--- a/drivers/gpu/drm/panel/panel-sitronix-st7789v.c
+++ b/drivers/gpu/drm/panel/panel-sitronix-st7789v.c
@@ -173,6 +173,21 @@ static const struct drm_display_mode default_mode = {
        .flags = DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC,
 };
 
+static const struct drm_display_mode t28cp45tn89_mode = {
+       .clock = 6008,
+       .hdisplay = 240,
+       .hsync_start = 240 + 38,
+       .hsync_end = 240 + 38 + 10,
+       .htotal = 240 + 38 + 10 + 10,
+       .vdisplay = 320,
+       .vsync_start = 320 + 8,
+       .vsync_end = 320 + 8 + 4,
+       .vtotal = 320 + 8 + 4 + 4,
+       .width_mm = 43,
+       .height_mm = 57,
+       .flags = DRM_MODE_FLAG_PVSYNC | DRM_MODE_FLAG_NVSYNC,
+};
+
 static const struct st7789_panel_info default_panel = {
        .mode = &default_mode,
        .invert_mode = true,
@@ -181,6 +196,14 @@ static const struct st7789_panel_info default_panel = {
                     DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE,
 };
 
+static const struct st7789_panel_info t28cp45tn89_panel = {
+       .mode = &t28cp45tn89_mode,
+       .invert_mode = false,
+       .bus_format = MEDIA_BUS_FMT_RGB565_1X16,
+       .bus_flags = DRM_BUS_FLAG_DE_HIGH |
+                    DRM_BUS_FLAG_PIXDATA_SAMPLE_POSEDGE,
+};
+
 static int st7789v_get_modes(struct drm_panel *panel,
                             struct drm_connector *connector)
 {
@@ -446,12 +469,14 @@ static void st7789v_remove(struct spi_device *spi)
 
 static const struct spi_device_id st7789v_spi_id[] = {
        { "st7789v", (unsigned long) &default_panel },
+       { "t28cp45tn89-v17", (unsigned long) &t28cp45tn89_panel },
        { }
 };
 MODULE_DEVICE_TABLE(spi, st7789v_spi_id);
 
 static const struct of_device_id st7789v_of_match[] = {
        { .compatible = "sitronix,st7789v", .data = &default_panel },
+       { .compatible = "inanbo,t28cp45tn89-v17", .data = &t28cp45tn89_panel },
        { }
 };
 MODULE_DEVICE_TABLE(of, st7789v_of_match);
-- 
2.40.1

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