[PATCH v3] drm/panel: simple: add SGD GKTW70SDAD1SD

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Add support for the Solomon Goldentek Display Model: GKTW70SDAD1SD
to panel-simple.

The panel spec from Variscite can be found at:
https://www.variscite.com/wp-content/uploads/2017/12/VLCD-CAP-GLD-RGB.pdf

Signed-off-by: Oliver Graute <oliver.graute@xxxxxxxxx>
Cc: Marco Felsch <m.felsch@xxxxxxxxxxxxxx>
Cc: Fabio Estevam <festevam@xxxxxxxxx>
---

v3:

- added flags
- added delay

v2:

- changed bpc to 6
- set max value of pixelclock
- increased hfront_porch and hback_porch
- dropped connector-type

adding of bus_format = MEDIA_BUS_FMT_RGB666_1X18 results in wrong colors.
omitting bus_format and using some default is better (Tux Pinguin is colored
fine)

 drivers/gpu/drm/panel/panel-simple.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
index 2be358f..c63f6a8 100644
--- a/drivers/gpu/drm/panel/panel-simple.c
+++ b/drivers/gpu/drm/panel/panel-simple.c
@@ -3336,6 +3336,36 @@ static const struct panel_desc satoz_sat050at40h12r2 = {
 	.connector_type = DRM_MODE_CONNECTOR_LVDS,
 };
 
+static const struct display_timing sgd_gktw70sdad1sd_timing = {
+	.pixelclock = {30000000, 30000000, 40000000},
+	.hactive = { 800, 800, 800},
+	.hfront_porch = {40, 40, 40},
+	.hback_porch = {40, 40, 40},
+	.hsync_len = {48, 48, 48},
+	.vactive = {480, 480, 480},
+	.vfront_porch = {13, 13, 13},
+	.vback_porch = {29, 29, 29},
+	.vsync_len = {3, 3, 3},
+	.flags = DISPLAY_FLAGS_HSYNC_LOW | DISPLAY_FLAGS_VSYNC_LOW |
+			DISPLAY_FLAGS_DE_HIGH | DISPLAY_FLAGS_PIXDATA_NEGEDGE,
+};
+
+static const struct panel_desc sgd_gktw70sdad1sd = {
+	.timings = &sgd_gktw70sdad1sd_timing,
+	.num_timings = 1,
+	.bpc = 6,
+	.size = {
+		.width = 153,
+		.height = 86,
+	},
+	.delay = {
+		.prepare = 20 + 20 + 10 + 10,
+		.enable = 50,
+		.disable = 50,
+		.unprepare =  10 + 10 + 20 + 20,
+	},
+};
+
 static const struct drm_display_mode sharp_ld_d5116z01b_mode = {
 	.clock = 168480,
 	.hdisplay = 1920,
@@ -4222,6 +4252,9 @@ static const struct of_device_id platform_of_match[] = {
 		.compatible = "satoz,sat050at40h12r2",
 		.data = &satoz_sat050at40h12r2,
 	}, {
+		.compatible = "sgd,gktw70sdad1sd",
+		.data = &sgd_gktw70sdad1sd,
+	}, {
 		.compatible = "sharp,ld-d5116z01b",
 		.data = &sharp_ld_d5116z01b,
 	}, {
-- 
2.7.4

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