[PATCH 1/2] drm/i915: Add function to check for linear surfaces

[Dhinakaran Pandiyan <dhinakaran.pandiyan@xxxxxxxxx>]

A framebuffer can comprise surfaces with distinct tiling formats,
making checks against modifier alone insufficient. Make use of a
function to identify a linear surface based on both modifier and color
plane.

Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@xxxxxxxxx>
---
 drivers/gpu/drm/i915/intel_display.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index fe045abb6472..5cf1dd0b741d 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -2205,6 +2205,11 @@ static u32 intel_adjust_tile_offset(int *x, int *y,
 	return new_offset;
 }
 
+static inline bool is_surface_linear(uint64_t modifier, int color_plane)
+{
+	return modifier == DRM_FORMAT_MOD_LINEAR;
+}
+
 static u32 intel_adjust_aligned_offset(int *x, int *y,
 				       const struct drm_framebuffer *fb,
 				       int color_plane,
@@ -2217,7 +2222,7 @@ static u32 intel_adjust_aligned_offset(int *x, int *y,
 
 	WARN_ON(new_offset > old_offset);
 
-	if (fb->modifier != DRM_FORMAT_MOD_LINEAR) {
+	if (!is_surface_linear(fb->modifier, color_plane)) {
 		unsigned int tile_size, tile_width, tile_height;
 		unsigned int pitch_tiles;
 
@@ -2281,14 +2286,13 @@ static u32 intel_compute_aligned_offset(struct drm_i915_private *dev_priv,
 					unsigned int rotation,
 					u32 alignment)
 {
-	uint64_t fb_modifier = fb->modifier;
 	unsigned int cpp = fb->format->cpp[color_plane];
 	u32 offset, offset_aligned;
 
 	if (alignment)
 		alignment--;
 
-	if (fb_modifier != DRM_FORMAT_MOD_LINEAR) {
+	if (!is_surface_linear(fb->modifier, color_plane)) {
 		unsigned int tile_size, tile_width, tile_height;
 		unsigned int tile_rows, tiles, pitch_tiles;
 
@@ -2525,7 +2529,7 @@ intel_fill_fb_info(struct drm_i915_private *dev_priv,
 						      tile_size);
 		offset /= tile_size;
 
-		if (fb->modifier != DRM_FORMAT_MOD_LINEAR) {
+		if (is_surface_linear(fb->modifier, i)) {
 			unsigned int tile_width, tile_height;
 			unsigned int pitch_tiles;
 			struct drm_rect r;
-- 
2.14.1

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