Re: [Intel-gfx] [PATCH 1/2] drm/display/dp: Assume 8 bpc support when DSC is supported
On Tue, Aug 29, 2023 at 11:44:10AM +0300, Jani Nikula wrote: > On Thu, 24 Aug 2023, Ankit Nautiyal wrote: > > As per DP v1.4, a DP DSC Sink device shall support 8bpc in DPCD 6Ah. > > Apparently some panels that do support DSC, are not setting the bit for > > 8bpc. > > > > So always assume 8bpc support by DSC decoder, when DSC is claimed to be > > supported. > > Maarten, Maxime, Thomas, ack for merging this via drm-intel? That's fine by me Maxime signature.asc Description: PGP signature
Re: [Intel-gfx] [PATCH 1/2] drm/display/dp: Assume 8 bpc support when DSC is supported
On Thu, 24 Aug 2023, Ankit Nautiyal wrote: > As per DP v1.4, a DP DSC Sink device shall support 8bpc in DPCD 6Ah. > Apparently some panels that do support DSC, are not setting the bit for > 8bpc. > > So always assume 8bpc support by DSC decoder, when DSC is claimed to be > supported. Maarten, Maxime, Thomas, ack for merging this via drm-intel? BR, Jani. > > v2: Use helper to get check dsc support. (Ankit) > v3: Fix styling and other typos. (Jani) > > Signed-off-by: Ankit Nautiyal > --- > drivers/gpu/drm/display/drm_dp_helper.c | 8 ++-- > 1 file changed, 6 insertions(+), 2 deletions(-) > > diff --git a/drivers/gpu/drm/display/drm_dp_helper.c > b/drivers/gpu/drm/display/drm_dp_helper.c > index e6a78fd32380..8a1b64c57dfd 100644 > --- a/drivers/gpu/drm/display/drm_dp_helper.c > +++ b/drivers/gpu/drm/display/drm_dp_helper.c > @@ -2449,12 +2449,16 @@ int drm_dp_dsc_sink_supported_input_bpcs(const u8 > dsc_dpcd[DP_DSC_RECEIVER_CAP_S > int num_bpc = 0; > u8 color_depth = dsc_dpcd[DP_DSC_DEC_COLOR_DEPTH_CAP - DP_DSC_SUPPORT]; > > + if (!drm_dp_sink_supports_dsc(dsc_dpcd)) > + return 0; > + > if (color_depth & DP_DSC_12_BPC) > dsc_bpc[num_bpc++] = 12; > if (color_depth & DP_DSC_10_BPC) > dsc_bpc[num_bpc++] = 10; > - if (color_depth & DP_DSC_8_BPC) > - dsc_bpc[num_bpc++] = 8; > + > + /* A DP DSC Sink device shall support 8 bpc. */ > + dsc_bpc[num_bpc++] = 8; > > return num_bpc; > } -- Jani Nikula, Intel Open Source Graphics Center
[PATCH 1/2] drm/display/dp: Assume 8 bpc support when DSC is supported
As per DP v1.4, a DP DSC Sink device shall support 8bpc in DPCD 6Ah. Apparently some panels that do support DSC, are not setting the bit for 8bpc. So always assume 8bpc support by DSC decoder, when DSC is claimed to be supported. v2: Use helper to get check dsc support. (Ankit) v3: Fix styling and other typos. (Jani) Signed-off-by: Ankit Nautiyal --- drivers/gpu/drm/display/drm_dp_helper.c | 8 ++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/display/drm_dp_helper.c b/drivers/gpu/drm/display/drm_dp_helper.c index e6a78fd32380..8a1b64c57dfd 100644 --- a/drivers/gpu/drm/display/drm_dp_helper.c +++ b/drivers/gpu/drm/display/drm_dp_helper.c @@ -2449,12 +2449,16 @@ int drm_dp_dsc_sink_supported_input_bpcs(const u8 dsc_dpcd[DP_DSC_RECEIVER_CAP_S int num_bpc = 0; u8 color_depth = dsc_dpcd[DP_DSC_DEC_COLOR_DEPTH_CAP - DP_DSC_SUPPORT]; + if (!drm_dp_sink_supports_dsc(dsc_dpcd)) + return 0; + if (color_depth & DP_DSC_12_BPC) dsc_bpc[num_bpc++] = 12; if (color_depth & DP_DSC_10_BPC) dsc_bpc[num_bpc++] = 10; - if (color_depth & DP_DSC_8_BPC) - dsc_bpc[num_bpc++] = 8; + + /* A DP DSC Sink device shall support 8 bpc. */ + dsc_bpc[num_bpc++] = 8; return num_bpc; } -- 2.40.1
