Reviewed-by: Lyude <cpaul@xxxxxxxxxx>
On Thu, 2016-08-04 at 14:08 -0700, Matt Roper wrote:
> The bspec was updated a couple weeks ago to add an extra block per
> line
> to plane watermark calculations for linear pixel formats.
>
> Bspec update 115327 description:
> "Gen9+ - Updated the plane blocks per line calculation for linear
> cases. Adds +1 for all linear cases to handle the non-block aligned
> stride cases."
>
> Cc: Lyude <cpaul@xxxxxxxxxx>
> Signed-off-by: Matt Roper <matthew.d.roper@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/intel_pm.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/intel_pm.c
> b/drivers/gpu/drm/i915/intel_pm.c
> index 4317cdf..6bd352a 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -3352,6 +3352,8 @@ static uint32_t skl_wm_method2(uint32_t
> pixel_rate, uint32_t pipe_htotal,
> plane_bytes_per_line *= 4;
> plane_blocks_per_line =
> DIV_ROUND_UP(plane_bytes_per_line, 512);
> plane_blocks_per_line /= 4;
> + } else if (tiling == DRM_FORMAT_MOD_NONE) {
> + plane_blocks_per_line =
> DIV_ROUND_UP(plane_bytes_per_line, 512) + 1;
> } else {
> plane_blocks_per_line =
> DIV_ROUND_UP(plane_bytes_per_line, 512);
> }
--
Cheers,
Lyude
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