1 files changed, 62 insertions, 10 deletions

diff --git a/drivers/gpu/drm/drm_fourcc.c b/drivers/gpu/drm/drm_fourcc.c
index 35c1e2742c27..90a1c846fc25 100644
--- a/drivers/gpu/drm/drm_fourcc.c
+++ b/drivers/gpu/drm/drm_fourcc.c
@@ -45,32 +45,49 @@ static char printable_char(int c)
  */
 uint32_t drm_mode_legacy_fb_format(uint32_t bpp, uint32_t depth)
 {
-	uint32_t fmt;
+	uint32_t fmt = DRM_FORMAT_INVALID;
 
 	switch (bpp) {
 	case 8:
-		fmt = DRM_FORMAT_C8;
+		if (depth == 8)
+			fmt = DRM_FORMAT_C8;
 		break;
+
 	case 16:
-		if (depth == 15)
+		switch (depth) {
+		case 15:
 			fmt = DRM_FORMAT_XRGB1555;
-		else
+			break;
+		case 16:
 			fmt = DRM_FORMAT_RGB565;
+			break;
+		default:
+			break;
+		}
 		break;
+
 	case 24:
-		fmt = DRM_FORMAT_RGB888;
+		if (depth == 24)
+			fmt = DRM_FORMAT_RGB888;
 		break;
+
 	case 32:
-		if (depth == 24)
+		switch (depth) {
+		case 24:
 			fmt = DRM_FORMAT_XRGB8888;
-		else if (depth == 30)
+			break;
+		case 30:
 			fmt = DRM_FORMAT_XRGB2101010;
-		else
+			break;
+		case 32:
 			fmt = DRM_FORMAT_ARGB8888;
+			break;
+		default:
+			break;
+		}
 		break;
+
 	default:
-		DRM_ERROR("bad bpp, assuming x8r8g8b8 pixel format\n");
-		fmt = DRM_FORMAT_XRGB8888;
 		break;
 	}
 
@@ -79,6 +96,41 @@ uint32_t drm_mode_legacy_fb_format(uint32_t bpp, uint32_t depth)
 EXPORT_SYMBOL(drm_mode_legacy_fb_format);
 
 /**
+ * drm_driver_legacy_fb_format - compute drm fourcc code from legacy description
+ * @bpp: bits per pixels
+ * @depth: bit depth per pixel
+ * @native: use host native byte order
+ *
+ * Computes a drm fourcc pixel format code for the given @bpp/@depth values.
+ * Unlike drm_mode_legacy_fb_format() this looks at the drivers mode_config,
+ * and depending on the quirk_addfb_prefer_host_byte_order flag it returns
+ * little endian byte order or host byte order framebuffer formats.
+ */
+uint32_t drm_driver_legacy_fb_format(struct drm_device *dev,
+				     uint32_t bpp, uint32_t depth)
+{
+	uint32_t fmt = drm_mode_legacy_fb_format(bpp, depth);
+
+	if (dev->mode_config.quirk_addfb_prefer_host_byte_order) {
+		if (fmt == DRM_FORMAT_XRGB8888)
+			fmt = DRM_FORMAT_HOST_XRGB8888;
+		if (fmt == DRM_FORMAT_ARGB8888)
+			fmt = DRM_FORMAT_HOST_ARGB8888;
+		if (fmt == DRM_FORMAT_RGB565)
+			fmt = DRM_FORMAT_HOST_RGB565;
+		if (fmt == DRM_FORMAT_XRGB1555)
+			fmt = DRM_FORMAT_HOST_XRGB1555;
+	}
+
+	if (dev->mode_config.quirk_addfb_prefer_xbgr_30bpp &&
+	    fmt == DRM_FORMAT_XRGB2101010)
+		fmt = DRM_FORMAT_XBGR2101010;
+
+	return fmt;
+}
+EXPORT_SYMBOL(drm_driver_legacy_fb_format);
+
+/**
  * drm_get_format_name - fill a string with a drm fourcc format's name
  * @format: format to compute name of
  * @buf: caller-supplied buffer