Re: [PATCH 1/5] drm/i915/fbc: Remove ancient 16k plane stride limit

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All 5 patches look ok to me, I didn't spot anything to comment about.

Reviewed-by: Juha-Pekka Heikkila <juhapekka.heikkila@xxxxxxxxx>

On 14.9.2023 14.38, Ville Syrjala wrote:
From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>

The 16k max plane stride limit seems to be originally from
i965gm, and no limit 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.

Cc: Swati Sharma <swati2.sharma@xxxxxxxxx>
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
---
  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 817e5784660b..1b3358a0fbfb 100644
--- a/drivers/gpu/drm/i915/display/intel_fbc.c
+++ b/drivers/gpu/drm/i915/display/intel_fbc.c
@@ -866,7 +866,8 @@ 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 */
@@ -874,9 +875,6 @@ 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;
  }




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