drm/amd/display: Consider sink max slice width limitation for dsc

[WHY&HOW]
The sink max slice width limitation should be considered for DSC, but
was removed in "refactor DSC cap calculations".
This patch adds it back and takes the valid minimum between the sink and
source.

Signed-off-by: Dillon Varone <Dillon.Varone@amd.com>
Signed-off-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Reviewed-by: Wenjing Liu <Wenjing.Liu@amd.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c b/drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c
index 1f53a9f..e4144b2 100644 (file)
--- a/drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c
+++ b/drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c
@@ -1157,6 +1157,11 @@ static bool setup_dsc_config(
        if (!is_dsc_possible)
                goto done;
 
+       /* increase miniumum slice count to meet sink slice width limitations */
+       min_slices_h = dc_fixpt_ceil(dc_fixpt_max(
+                       dc_fixpt_div_int(dc_fixpt_from_int(pic_width), dsc_common_caps.max_slice_width), // sink min
+                       dc_fixpt_from_int(min_slices_h))); // source min
+
        min_slices_h = fit_num_slices_up(dsc_common_caps.slice_caps, min_slices_h);
 
        /* increase minimum slice count to meet sink throughput limitations */