drm/i915: Clean up the sprite modifier checks

Split the g4x and snb cases into separate functions to match how we deal
with all other platforms. Also sort the switch cases to match the format
lists we've declared earlier, to ease comparisons.

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/20171222192231.17981-5-ville.syrjala@linux.intel.com
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_sprite.c

@@ -1169,12 +1169,9 @@ static const uint64_t skl_plane_format_modifiers[] = {
 	DRM_FORMAT_MOD_INVALID
 };
 
-static bool g4x_sprite_plane_format_mod_supported(struct drm_plane *plane,
-						  uint32_t format,
-						  uint64_t modifier)
+static bool g4x_mod_supported(uint32_t format, uint64_t modifier)
 {
 	switch (format) {
-	case DRM_FORMAT_XBGR8888:
 	case DRM_FORMAT_XRGB8888:
 	case DRM_FORMAT_YUYV:
 	case DRM_FORMAT_YVYU:
@@ -1189,22 +1186,38 @@ static bool g4x_sprite_plane_format_mod_supported(struct drm_plane *plane,
 	}
 }
 
-static bool vlv_sprite_plane_format_mod_supported(struct drm_plane *plane,
-						  uint32_t format,
-						  uint64_t modifier)
+static bool snb_mod_supported(uint32_t format, uint64_t modifier)
 {
 	switch (format) {
+	case DRM_FORMAT_XRGB8888:
+	case DRM_FORMAT_XBGR8888:
 	case DRM_FORMAT_YUYV:
 	case DRM_FORMAT_YVYU:
 	case DRM_FORMAT_UYVY:
 	case DRM_FORMAT_VYUY:
+		if (modifier == DRM_FORMAT_MOD_LINEAR ||
+		    modifier == I915_FORMAT_MOD_X_TILED)
+			return true;
+		/* fall through */
+	default:
+		return false;
+	}
+}
+
+static bool vlv_mod_supported(uint32_t format, uint64_t modifier)
+{
+	switch (format) {
 	case DRM_FORMAT_RGB565:
-	case DRM_FORMAT_XRGB8888:
+	case DRM_FORMAT_ABGR8888:
 	case DRM_FORMAT_ARGB8888:
+	case DRM_FORMAT_XBGR8888:
+	case DRM_FORMAT_XRGB8888:
 	case DRM_FORMAT_XBGR2101010:
 	case DRM_FORMAT_ABGR2101010:
-	case DRM_FORMAT_XBGR8888:
-	case DRM_FORMAT_ABGR8888:
+	case DRM_FORMAT_YUYV:
+	case DRM_FORMAT_YVYU:
+	case DRM_FORMAT_UYVY:
+	case DRM_FORMAT_VYUY:
 		if (modifier == DRM_FORMAT_MOD_LINEAR ||
 		    modifier == I915_FORMAT_MOD_X_TILED)
 			return true;
@@ -1214,11 +1227,8 @@ static bool vlv_sprite_plane_format_mod_supported(struct drm_plane *plane,
 	}
 }
 
-static bool skl_sprite_plane_format_mod_supported(struct drm_plane *plane,
-						  uint32_t format,
-						  uint64_t modifier)
+static bool skl_mod_supported(uint32_t format, uint64_t modifier)
 {
-	/* This is the same as primary plane since SKL has universal planes */
 	switch (format) {
 	case DRM_FORMAT_XRGB8888:
 	case DRM_FORMAT_XBGR8888:
@@ -1259,13 +1269,13 @@ static bool intel_sprite_plane_format_mod_supported(struct drm_plane *plane,
 		return false;
 
 	if (INTEL_GEN(dev_priv) >= 9)
-		return skl_sprite_plane_format_mod_supported(plane, format, modifier);
+		return skl_mod_supported(format, modifier);
 	else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
-		return vlv_sprite_plane_format_mod_supported(plane, format, modifier);
+		return vlv_mod_supported(format, modifier);
+	else if (INTEL_GEN(dev_priv) >= 6)
+		return snb_mod_supported(format, modifier);
 	else
-		return g4x_sprite_plane_format_mod_supported(plane, format, modifier);
-
-	unreachable();
+		return g4x_mod_supported(format, modifier);
 }
 
 static const struct drm_plane_funcs intel_sprite_plane_funcs = {