On Fri, Dec 21, 2018 at 07:14:31PM +0200, Ville Syrjala wrote:
> From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
>
> Bspec says we have to reject the watermark if it's >= the ddb
> allocation. Fix the code to reject the == case as it should.
> For transition watermarks we can just use >=, for the rest
> we'll do +1 when calculating the minimum ddb allocation size.
>
> Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Reviewed-by: Matt Roper <matthew.d.roper@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/intel_pm.c | 10 +++++-----
> 1 file changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index 55a1c577f060..3c5cba31f055 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -4371,8 +4371,8 @@ skl_allocate_pipe_ddb(struct intel_crtc_state *cstate,
> continue;
>
> wm = &cstate->wm.skl.optimal.planes[plane_id];
> - blocks += wm->wm[level].plane_res_b;
> - blocks += wm->uv_wm[level].plane_res_b;
> + blocks += wm->wm[level].plane_res_b + 1;
> + blocks += wm->uv_wm[level].plane_res_b + 1;
> }
>
> if (blocks < alloc_size) {
> @@ -4413,7 +4413,7 @@ skl_allocate_pipe_ddb(struct intel_crtc_state *cstate,
> extra = min_t(u16, alloc_size,
> DIV64_U64_ROUND_UP(alloc_size * rate,
> total_data_rate));
> - total[plane_id] = wm->wm[level].plane_res_b + extra;
> + total[plane_id] = wm->wm[level].plane_res_b + 1 + extra;
> alloc_size -= extra;
> total_data_rate -= rate;
>
> @@ -4424,7 +4424,7 @@ skl_allocate_pipe_ddb(struct intel_crtc_state *cstate,
> extra = min_t(u16, alloc_size,
> DIV64_U64_ROUND_UP(alloc_size * rate,
> total_data_rate));
> - uv_total[plane_id] = wm->uv_wm[level].plane_res_b + extra;
> + uv_total[plane_id] = wm->uv_wm[level].plane_res_b + 1 + extra;
> alloc_size -= extra;
> total_data_rate -= rate;
> }
> @@ -4477,7 +4477,7 @@ skl_allocate_pipe_ddb(struct intel_crtc_state *cstate,
> */
> for_each_plane_id_on_crtc(intel_crtc, plane_id) {
> wm = &cstate->wm.skl.optimal.planes[plane_id];
> - if (wm->trans_wm.plane_res_b > total[plane_id])
> + if (wm->trans_wm.plane_res_b >= total[plane_id])
> memset(&wm->trans_wm, 0, sizeof(wm->trans_wm));
> }
>
> --
> 2.19.2
>
> _______________________________________________
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> Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx
--
Matt Roper
Graphics Software Engineer
IoTG Platform Enabling & Development
Intel Corporation
(916) 356-2795
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