drm: Check that the plane supports the request format+modifier combo

Currently we only check that the plane supports the pixel format of the
fb we're about to feed to it. Extend it to check also the modifier, and
more specifically that the combination of the format and modifier is
supported.

Cc: dri-devel@lists.freedesktop.org
Cc: Ben Widawsky <ben@bwidawsk.net>
Cc: Jason Ekstrand <jason@jlekstrand.net>
Cc: Daniel Stone <daniels@collabora.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171222192231.17981-8-ville.syrjala@linux.intel.com
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/drm_atomic.c

@@ -882,12 +882,14 @@ static int drm_atomic_plane_check(struct drm_plane *plane,
 	}
 
 	/* Check whether this plane supports the fb pixel format. */
-	ret = drm_plane_check_pixel_format(plane, state->fb->format->format);
+	ret = drm_plane_check_pixel_format(plane, state->fb->format->format,
+					   state->fb->modifier);
 	if (ret) {
 		struct drm_format_name_buf format_name;
-		DRM_DEBUG_ATOMIC("Invalid pixel format %s\n",
-		                 drm_get_format_name(state->fb->format->format,
-		                                     &format_name));
+		DRM_DEBUG_ATOMIC("Invalid pixel format %s, modifier 0x%llx\n",
+				 drm_get_format_name(state->fb->format->format,
+						     &format_name),
+				 state->fb->modifier);
 		return ret;
 	}
 

drivers/gpu/drm/drm_crtc.c

@@ -629,12 +629,14 @@ retry:
 		 */
 		if (!crtc->primary->format_default) {
 			ret = drm_plane_check_pixel_format(crtc->primary,
-							   fb->format->format);
+							   fb->format->format,
+							   fb->modifier);
 			if (ret) {
 				struct drm_format_name_buf format_name;
-				DRM_DEBUG_KMS("Invalid pixel format %s\n",
-				              drm_get_format_name(fb->format->format,
-				                                  &format_name));
+				DRM_DEBUG_KMS("Invalid pixel format %s, modifier 0x%llx\n",
+					      drm_get_format_name(fb->format->format,
+								  &format_name),
+					      fb->modifier);
 				goto out;
 			}
 		}

drivers/gpu/drm/drm_crtc_internal.h

@@ -196,8 +196,8 @@ int drm_mode_atomic_ioctl(struct drm_device *dev,
 /* drm_plane.c */
 int drm_plane_register_all(struct drm_device *dev);
 void drm_plane_unregister_all(struct drm_device *dev);
-int drm_plane_check_pixel_format(const struct drm_plane *plane,
-				 u32 format);
+int drm_plane_check_pixel_format(struct drm_plane *plane,
+				 u32 format, u64 modifier);
 
 /* drm_bridge.c */
 void drm_bridge_detach(struct drm_bridge *bridge);

drivers/gpu/drm/drm_plane.c

@@ -549,16 +549,33 @@ int drm_mode_getplane(struct drm_device *dev, void *data,
 	return 0;
 }
 
-int drm_plane_check_pixel_format(const struct drm_plane *plane, u32 format)
+int drm_plane_check_pixel_format(struct drm_plane *plane,
+				 u32 format, u64 modifier)
 {
 	unsigned int i;
 
 	for (i = 0; i < plane->format_count; i++) {
 		if (format == plane->format_types[i])
-			return 0;
+			break;
+	}
+	if (i == plane->format_count)
+		return -EINVAL;
+
+	if (!plane->modifier_count)
+		return 0;
+
+	for (i = 0; i < plane->modifier_count; i++) {
+		if (modifier == plane->modifiers[i])
+			break;
 	}
+	if (i == plane->modifier_count)
+		return -EINVAL;
 
-	return -EINVAL;
+	if (plane->funcs->format_mod_supported &&
+	    !plane->funcs->format_mod_supported(plane, format, modifier))
+		return -EINVAL;
+
+	return 0;
 }
 
 /*
@@ -602,12 +619,14 @@ static int __setplane_internal(struct drm_plane *plane,
 	}
 
 	/* Check whether this plane supports the fb pixel format. */
-	ret = drm_plane_check_pixel_format(plane, fb->format->format);
+	ret = drm_plane_check_pixel_format(plane, fb->format->format,
+					   fb->modifier);
 	if (ret) {
 		struct drm_format_name_buf format_name;
-		DRM_DEBUG_KMS("Invalid pixel format %s\n",
-		              drm_get_format_name(fb->format->format,
-		                                  &format_name));
+		DRM_DEBUG_KMS("Invalid pixel format %s, modifier 0x%llx\n",
+			      drm_get_format_name(fb->format->format,
+						  &format_name),
+			      fb->modifier);
 		goto out;
 	}