[Intel-gfx] [PATCH v2 1/6] drm/i915/fbc: Remove ancient 16k plane stride limit

[Ville Syrjala]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

The 16k max plane stride limit seems to be originally from
i965gm, and no explicit limit has been specified since (g4x+).
So let's assume the max plane stride itself is a suitable limit
also for the more recent FBC hardware.

In fact even for i965gm the max X-tiled stride is also 16k so
technically we don't need the check there either, but let's
keep it there anyway since it's explicitly mentioned in the
spec. Gen2/3 have more strict limits checked separately.

Reviewed-by: Swati Sharma <swati2.sharma at intel.com>
Reviewed-by: Juha-Pekka Heikkila <juhapekka.heikkila at gmail.com>
Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/display/intel_fbc.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_fbc.c b/drivers/gpu/drm/i915/display/intel_fbc.c
index 5f13c6776c7d..f12ea170b748 100644
--- a/drivers/gpu/drm/i915/display/intel_fbc.c
+++ b/drivers/gpu/drm/i915/display/intel_fbc.c
@@ -871,7 +871,8 @@ static bool stride_is_valid(const struct intel_plane_state *plane_state)
 	if (DISPLAY_VER(i915) == 2 || DISPLAY_VER(i915) == 3)
 		return stride == 4096 || stride == 8192;
 
-	if (DISPLAY_VER(i915) == 4 && !IS_G4X(i915) && stride < 2048)
+	if (DISPLAY_VER(i915) == 4 && !IS_G4X(i915) &&
+	    (stride < 2048 || stride > 16384))
 		return false;
 
 	/* Display WA #1105: skl,bxt,kbl,cfl,glk */
@@ -879,9 +880,6 @@ static bool stride_is_valid(const struct intel_plane_state *plane_state)
 	    fb->modifier == DRM_FORMAT_MOD_LINEAR && stride & 511)
 		return false;
 
-	if (stride > 16384)
-		return false;
-
 	return true;
 }
 
-- 
2.41.0