[PATCH v2] drm/panel: Add simple panel mode for the ARM RTSM

[Linus Walleij <linus.walleij@xxxxxxxxxx>]

Having failed any attempts at a more generic solution,
I fall back to the very specific solution: define a simple
panel for the ARM RTSM emulated platforms.

I am doing this so we can convert all old users from the
previous fbdev driver to the PL111 DRM driver.

This works fine as far as I can test, provided the
device tree for RTSM AEMv8 is augmented accordingly.

Cc: Sudeep Holla <sudeep.holla@xxxxxxx>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx>
Cc: Mali DP Maintainers <malidp@xxxxxxxxxxxx>
Cc: Robin Murphy <robin.murphy@xxxxxxx>
Reviewed-by: Liviu Dudau <liviu.dudau@xxxxxxx>
Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
---
ChangeLog v1->v2:
- Change compatible to simply "arm,rtsm-display" as there
  are several of these RTSMs
- Collect Liviu's review tag
---
 drivers/gpu/drm/panel/panel-simple.c | 30 ++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
index 97964f7f2ace..cd4e741b94e8 100644
--- a/drivers/gpu/drm/panel/panel-simple.c
+++ b/drivers/gpu/drm/panel/panel-simple.c
@@ -2323,6 +2323,33 @@ static const struct panel_desc winstar_wf35ltiacd = {
 	.bus_format = MEDIA_BUS_FMT_RGB888_1X24,
 };
 
+static const struct drm_display_mode arm_rtsm_mode[] = {
+	{
+		.clock = 65000,
+		.hdisplay = 1024,
+		.hsync_start = 1024 + 24,
+		.hsync_end = 1024 + 24 + 136,
+		.htotal = 1024 + 24 + 136 + 160,
+		.vdisplay = 768,
+		.vsync_start = 768 + 3,
+		.vsync_end = 768 + 3 + 6,
+		.vtotal = 768 + 3 + 6 + 29,
+		.vrefresh = 60,
+		.flags = DRM_MODE_FLAG_NVSYNC | DRM_MODE_FLAG_NHSYNC,
+	},
+};
+
+static const struct panel_desc arm_rtsm = {
+	.modes = arm_rtsm_mode,
+	.num_modes = 1,
+	.bpc = 8,
+	.size = {
+		.width = 400,
+		.height = 300,
+	},
+	.bus_format = MEDIA_BUS_FMT_RGB888_1X24,
+};
+
 static const struct of_device_id platform_of_match[] = {
 	{
 		.compatible = "ampire,am-480272h3tmqw-t01h",
@@ -2330,6 +2357,9 @@ static const struct of_device_id platform_of_match[] = {
 	}, {
 		.compatible = "ampire,am800480r3tmqwa1h",
 		.data = &ampire_am800480r3tmqwa1h,
+	}, {
+		.compatible = "arm,rtsm-display",
+		.data = &arm_rtsm,
 	}, {
 		.compatible = "auo,b101aw03",
 		.data = &auo_b101aw03,
-- 
2.17.2

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