[Intel-gfx] [PATCH 1/5] drm/i915/fbc: Remove ancient 16k plane stride limit
Sharma, Swati2
swati2.sharma at intel.com
Fri Sep 15 05:15:46 UTC 2023
Thanks Ville for the fix!
LGTM
Reviewed-by: Swati Sharma <swati2.sharma at intel.com>
On 14-Sep-23 5:08 PM, Ville Syrjala wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
>
> The 16k max plane stride limit seems to be originally from
> i965gm, and no limit explicit limit has been specified since (g4x+).
nitpick: "limit" seems to be extra here
> 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 at intel.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 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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