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drm/amd/display: Make sure DSC slice height is divisible by 2 for 4:2:0 color format

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[why] DSC spec requires this

Signed-off-by: Nikola Cornij <nikola.cornij@amd.com>
Reviewed-by: Wenjing Liu <Wenjing.Liu@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Nikola Cornij 2019-03-28 17:40:18 -04:00 committed by Alex Deucher
parent d438d11338
commit 23882a693f
1 changed files with 11 additions and 2 deletions
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13
drivers/gpu/drm/amd/display/dc/dsc/dc_dsc.c
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@ -658,14 +658,23 @@ static bool setup_dsc_config(
dsc_cfg->num_slices_h = num_slices_h;
slice_width = pic_width / num_slices_h;
// Vertical number of slices: start from policy and pick the first one that height is divisible by
// Vertical number of slices: start from policy and pick the first one that height is divisible by.
// For 4:2:0 make sure the slice height is divisible by 2 as well.
pic_height = timing->v_addressable + timing->v_border_top + timing->v_border_bottom;
num_slices_v = dsc_policy.num_slices_v;
if (num_slices_v < 1)
num_slices_v = 1;
while (num_slices_v >= 1 && (pic_height % num_slices_v != 0))
while (num_slices_v >= 1) {
if (timing->pixel_encoding == PIXEL_ENCODING_YCBCR420) {
int slice_height = pic_height / num_slices_v;
if (pic_height % num_slices_v == 0 && slice_height % 2 == 0)
break;
} else if (pic_height % num_slices_v == 0)
break;
num_slices_v--;
}
dsc_cfg->num_slices_v = num_slices_v;