drm: panel-simple: Problems to use Seiko 43WVF1G panel and DRM_MXS driver on the i.MX6SX SabreSD.

[Breno Matheus Lima]

Hi,

I'm trying to use the Seiko 43WVF1G panel (Datasheet link:
http://www.glyn.de/data/glyn/media/doc/43wvf1g-0.pdf) and the DRM_MXS
driver on
the i.MX6SX SabreSD. Applying the patch below removes the old
timing configuration on the dtsi and adds it to the panel-simple.c
I can get the display working, but the image is out of place. Another point
to
note is that it's necessary to set the reg_lcd_3v3 to regulator-always-on
otherwise the gpio3 27 does not get enabled.

The main two problems that I'm having at the moment are:

- Gpio3 27 is not being set by the driver, function
panel_simple_prepare(struct drm_panel *panel) is not being called.
- The image is displaced even when using the same timing values in
the datasheet.

I would like to know if I'm doing something wrong on my dtsi, or if
something
is missing on the panel-simple.c. I would appreciate any help.

Thanks!

diff --git a/arch/arm/boot/dts/imx6sx-sdb.dtsi
b/arch/arm/boot/dts/imx6sx-sdb.dtsi
index da81552..13fcce9 100644
--- a/arch/arm/boot/dts/imx6sx-sdb.dtsi
+++ b/arch/arm/boot/dts/imx6sx-sdb.dtsi
@@ -24,7 +24,7 @@
         reg = <0x80000000 0x40000000>;
     };

-    backlight {
+    backlight_display: backlight-display {
         compatible = "pwm-backlight";
         pwms = <&pwm3 0 5000000>;
         brightness-levels = <0 4 8 16 32 64 128 255>;
@@ -104,6 +104,7 @@
             regulator-name = "lcd-3v3";
             gpio = <&gpio3 27 0>;
             enable-active-high;
+            regulator-always-on;
         };

         reg_peri_3v3: regulator at 5 {
@@ -146,6 +147,19 @@
         mux-int-port = <2>;
         mux-ext-port = <6>;
     };
+
+    panel {
+        compatible = "seiko,43wvf1g", "simple-panel";
+        backlight = <&backlight_display>;
+
+        power-supply = <&reg_lcd_3v3>;
+
+        port {
+            panel_in: endpoint {
+                remote-endpoint = <&display_out>;
+            };
+        };
+    };
 };

 &audmux {
@@ -215,33 +229,14 @@
 &lcdif1 {
     pinctrl-names = "default";
     pinctrl-0 = <&pinctrl_lcd>;
-    lcd-supply = <&reg_lcd_3v3>;
-    display = <&display0>;
     status = "okay";

-    display0: display0 {
-        bits-per-pixel = <16>;
-        bus-width = <24>;
-
-        display-timings {
-            native-mode = <&timing0>;
-            timing0: timing0 {
-                clock-frequency = <33500000>;
-                hactive = <800>;
-                vactive = <480>;
-                hback-porch = <89>;
-                hfront-porch = <164>;
-                vback-porch = <23>;
-                vfront-porch = <10>;
-                hsync-len = <10>;
-                vsync-len = <10>;
-                hsync-active = <0>;
-                vsync-active = <0>;
-                de-active = <1>;
-                pixelclk-active = <0>;
-            };
+    port{
+        display_out: endpoint {
+            remote-endpoint = <&panel_in>;
         };
     };
+
 };

 &pwm3 {
diff --git a/drivers/gpu/drm/panel/panel-simple.c
b/drivers/gpu/drm/panel/panel-simple.c
index 06aaf79..8faefee 100644
--- a/drivers/gpu/drm/panel/panel-simple.c
+++ b/drivers/gpu/drm/panel/panel-simple.c
@@ -863,6 +863,31 @@ static const struct panel_desc hannstar_hsd070pww1 = {
     .bus_format = MEDIA_BUS_FMT_RGB666_1X7X3_SPWG,
 };

+static const struct display_timing seiko_43wvf1g_timing = {
+    .pixelclock = { 33500000, 33500000, 33500000 },
+    .hactive = { 800, 800, 800 },
+    .hfront_porch = {  164, 164, 164 },
+    .hback_porch = { 89, 89, 89 },
+    .hsync_len = { 10, 10, 10 },
+    .vactive = { 480, 480, 480 },
+    .vfront_porch = { 10, 10, 10 },
+    .vback_porch = { 23, 23, 23 },
+    .vsync_len = { 10, 10, 10 },
+    .flags = DISPLAY_FLAGS_DE_HIGH | DISPLAY_FLAGS_PIXDATA_NEGEDGE |
+            DISPLAY_FLAGS_HSYNC_LOW | DISPLAY_FLAGS_VSYNC_LOW,
+};
+
+static const struct panel_desc seiko_43wvf1g = {
+    .timings = &seiko_43wvf1g_timing,
+    .num_timings = 1,
+    .bpc = 8,
+    .size = {
+        .width = 93,
+        .height = 57,
+    },
+    .bus_format = MEDIA_BUS_FMT_RGB888_1X24,
+};
+
 static const struct display_timing hannstar_hsd100pxn1_timing = {
     .pixelclock = { 55000000, 65000000, 75000000 },
     .hactive = { 1024, 1024, 1024 },
@@ -1853,6 +1878,9 @@ static const struct of_device_id platform_of_match[]
= {
         .compatible = "samsung,ltn140at29-301",
         .data = &samsung_ltn140at29_301,
     }, {
+        .compatible = "seiko,43wvf1g",
+        .data = &seiko_43wvf1g,
+    }, {
         .compatible = "sharp,lq101k1ly04",
         .data = &sharp_lq101k1ly04,
     }, {
--
2.7.4


--
Breno Matheus Lima
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