drm: move the fb bpp/depth helper into the core.

This is used by nearly everyone including vmwgfx which doesn't generally
use the fb helper.

Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 41 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_crtc.c b/drivers/gpu/drm/drm_crtc.c
index e54c0a6a3072..07c80fd7a98d 100644
--- a/drivers/gpu/drm/drm_crtc.c
+++ b/drivers/gpu/drm/drm_crtc.c
@@ -3136,3 +3136,44 @@ int drm_mode_destroy_dumb_ioctl(struct drm_device *dev,
 
         return dev->driver->dumb_destroy(file_priv, dev, args->handle);
 }
+
+/*
+ * Just need to support RGB formats here for compat with code that doesn't
+ * use pixel formats directly yet.
+ */
+void drm_fb_get_bpp_depth(uint32_t format, unsigned int *depth,
+                          int *bpp)
+{
+        switch (format) {
+        case DRM_FOURCC_RGB332:
+                *depth = 8;
+                *bpp = 8;
+                break;
+        case DRM_FOURCC_RGB555:
+                *depth = 15;
+                *bpp = 16;
+                break;
+        case DRM_FOURCC_RGB565:
+                *depth = 16;
+                *bpp = 16;
+                break;
+        case DRM_FOURCC_RGB24:
+                *depth = 24;
+                *bpp = 32;
+                break;
+        case DRM_INTEL_RGB30:
+                *depth = 30;
+                *bpp = 32;
+                break;
+        case DRM_FOURCC_RGB32:
+                *depth = 32;
+                *bpp = 32;
+                break;
+        default:
+                DRM_DEBUG_KMS("unsupported pixel format\n");
+                *depth = 0;
+                *bpp = 0;
+                break;
+        }
+}
+EXPORT_SYMBOL(drm_fb_get_bpp_depth);