video: tegra-dc: request timings from panel driver first

Check if panel driver has display timings and get those.
If panel driver does not pass timing, try to find timing
under rgb node for backwards compatibility.

Tested-by: Robert Eckelmann <[email protected]> # ASUS TF101 T20
Tested-by: Nicolas Chauvet <[email protected]> # Paz00
Tested-by: Andreas Westman Dorcsak <[email protected]> # ASUS TF T30
Tested-by: Svyatoslav Ryhel <[email protected]> # LG P895 T30
Signed-off-by: Svyatoslav Ryhel <[email protected]>

1 files changed, 17 insertions, 12 deletions

diff --git a/drivers/video/tegra20/tegra-dc.c b/drivers/video/tegra20/tegra-dc.c
index ff67cc89892..91298b7b7f9 100644
--- a/drivers/video/tegra20/tegra-dc.c
+++ b/drivers/video/tegra20/tegra-dc.c
@@ -380,18 +380,6 @@ static int tegra_lcd_of_to_plat(struct udevice *dev)
 		return -EINVAL;
 	}
 
-	ret = fdtdec_decode_display_timing(blob, rgb, 0, &priv->timing);
-	if (ret) {
-		debug("%s: Cannot read display timing for '%s' (ret=%d)\n",
-		      __func__, dev->name, ret);
-		return -EINVAL;
-	}
-	timing = &priv->timing;
-	priv->width = timing->hactive.typ;
-	priv->height = timing->vactive.typ;
-	priv->pixel_clock = timing->pixelclock.typ;
-	priv->log2_bpp = VIDEO_BPP16;
-
 	/*
 	 * Sadly the panel phandle is in an rgb subnode so we cannot use
 	 * uclass_get_device_by_phandle().
@@ -401,6 +389,7 @@ static int tegra_lcd_of_to_plat(struct udevice *dev)
 		debug("%s: Cannot find panel information\n", __func__);
 		return -EINVAL;
 	}
+
 	ret = uclass_get_device_by_of_offset(UCLASS_PANEL, panel_node,
 					     &priv->panel);
 	if (ret) {
@@ -409,6 +398,22 @@ static int tegra_lcd_of_to_plat(struct udevice *dev)
 		return ret;
 	}
 
+	ret = panel_get_display_timing(priv->panel, &priv->timing);
+	if (ret) {
+		ret = fdtdec_decode_display_timing(blob, rgb, 0, &priv->timing);
+		if (ret) {
+			debug("%s: Cannot read display timing for '%s' (ret=%d)\n",
+			      __func__, dev->name, ret);
+			return -EINVAL;
+		}
+	}
+
+	timing = &priv->timing;
+	priv->width = timing->hactive.typ;
+	priv->height = timing->vactive.typ;
+	priv->pixel_clock = timing->pixelclock.typ;
+	priv->log2_bpp = VIDEO_BPP16;
+
 	return 0;
 }