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disp: msm: dp: Ensure sink supports DSC decoding of selected BPC

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The sink may have limited DSC decoding support
for some BPC values. Ensure that the BPC that is
selected is within the sink's DSC capabilities.

CRs-Fixed: 2527660
Change-Id: I0692e7b606e258c3cab3de25d3b03178f4aa0294
Signed-off-by: Fuad Hossain <fhossain@codeaurora.org>
This commit is contained in:
Fuad Hossain
2019-09-26 15:38:52 -04:00
committed by Gerrit - the friendly Code Review server
parent cc1226edbc
commit f3aa71a5e6
2 changed files with 25 additions and 3 deletions
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27
msm/dp/dp_panel.c
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@@ -2023,7 +2023,9 @@ static void dp_panel_decode_dsc_dpcd(struct dp_panel *dp_panel)
dp_panel->sink_dsc_caps.dsc_capable = true;
dp_panel->sink_dsc_caps.version = dp_panel->dsc_dpcd[1];
dp_panel->sink_dsc_caps.block_pred_en =
dp_panel->dsc_dpcd[6] ? true : false;
dp_panel->dsc_dpcd[6] ? true : false;
dp_panel->sink_dsc_caps.color_depth =
dp_panel->dsc_dpcd[10];
if (dp_panel->sink_dsc_caps.version >= 0x11)
dp_panel->dsc_en = true;
@@ -2181,12 +2183,31 @@ static u32 dp_panel_get_supported_bpp(struct dp_panel *dp_panel,
link_info = &dp_panel->link_info;
data_rate_khz = link_info->num_lanes * link_info->rate * 8;
while (bpp > min_supported_bpp) {
for (; bpp > min_supported_bpp; bpp -= 6) {
if (dp_panel->dsc_en) {
if (bpp == 36 && !(dp_panel->sink_dsc_caps.color_depth
& DP_DSC_12_BPC))
continue;
else if (bpp == 30 &&
!(dp_panel->sink_dsc_caps.color_depth &
DP_DSC_10_BPC))
continue;
else if (bpp == 24 &&
!(dp_panel->sink_dsc_caps.color_depth &
DP_DSC_8_BPC))
continue;
}
if (mode_pclk_khz * bpp <= data_rate_khz)
break;
bpp -= 6;
}
if (bpp < min_supported_bpp)
DP_ERR("bpp %d is below minimum supported bpp %d\n", bpp,
min_supported_bpp);
if (dp_panel->dsc_en && bpp != 24 && bpp != 30 && bpp != 36)
DP_ERR("bpp %d is not supported when dsc is enabled\n", bpp);
return bpp;
}