From: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
DSC is available on the display emulator, but not set in DPCD.
Override the entries to allow bigjoiner testing.
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/drm_dp_helper.c | 4 ++--
include/drm/drm_dp_helper.h | 1 +
2 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
index a3c82e726057..d3aa9b696e31 100644
--- a/drivers/gpu/drm/drm_dp_helper.c
+++ b/drivers/gpu/drm/drm_dp_helper.c
@@ -1434,7 +1434,7 @@ u8 drm_dp_dsc_sink_max_slice_count(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE],
if (slice_cap1 & DP_DSC_4_PER_DP_DSC_SINK)
return 4;
if (slice_cap1 & DP_DSC_2_PER_DP_DSC_SINK)
- return 2;
+ return 4;
if (slice_cap1 & DP_DSC_1_PER_DP_DSC_SINK)
return 1;
} else {
@@ -1458,7 +1458,7 @@ u8 drm_dp_dsc_sink_max_slice_count(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE],
if (slice_cap1 & DP_DSC_4_PER_DP_DSC_SINK)
return 4;
if (slice_cap1 & DP_DSC_2_PER_DP_DSC_SINK)
- return 2;
+ return 4;
if (slice_cap1 & DP_DSC_1_PER_DP_DSC_SINK)
return 1;
}
diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
index e47dc22ebf50..2cce09a37e95 100644
--- a/include/drm/drm_dp_helper.h
+++ b/include/drm/drm_dp_helper.h
@@ -1416,6 +1416,7 @@ int drm_dp_dsc_sink_supported_input_bpcs(const u8 dsc_dpc[DP_DSC_RECEIVER_CAP_SI
static inline bool
drm_dp_sink_supports_dsc(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_SIZE])
{
+ return dsc_dpcd[DP_DSC_REV - DP_DSC_SUPPORT];
return dsc_dpcd[DP_DSC_SUPPORT - DP_DSC_SUPPORT] &
DP_DSC_DECOMPRESSION_IS_SUPPORTED;
}
--
2.19.1
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