When BT.2020 colorimetry is selected, the driver sends information using
VSC SDP but does not set "ignore MSA colorimetry" bit on older GPUs with
DCE-based IPs. This causes certain sinks to prefer colorimetry
information in DP MSA, resulting in terrible color rendering ("dull"
colors) when HDR is enabled.This commit wires up the MISC1 bit 6 for GPUs with DCE 11.x based IPs to correctly configure sinks to ignore colorimetry information in MSA, resolving the color rendering issue. Closes: https://gitlab.freedesktop.org/drm/amd/-/work_items/4849 Assisted-by: oh-my-pi:GPT-5.5 Signed-off-by: Leorize <[email protected]> --- .../drm/amd/display/dc/dce/dce_stream_encoder.c | 15 ++++++++++++++- .../drm/amd/display/dc/dce/dce_stream_encoder.h | 3 ++- 2 files changed, 16 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/amd/display/dc/dce/dce_stream_encoder.c b/drivers/gpu/drm/amd/display/dc/dce/dce_stream_encoder.c index ed407e779c12..2c3a20d35fe9 100644 --- a/drivers/gpu/drm/amd/display/dc/dce/dce_stream_encoder.c +++ b/drivers/gpu/drm/amd/display/dc/dce/dce_stream_encoder.c @@ -271,7 +271,6 @@ static void dce110_stream_encoder_dp_set_stream_attribute( bool use_vsc_sdp_for_colorimetry, uint32_t enable_sdp_splitting) { - (void)use_vsc_sdp_for_colorimetry; (void)enable_sdp_splitting; uint32_t h_active_start; uint32_t v_active_start; @@ -334,6 +333,16 @@ static void dce110_stream_encoder_dp_set_stream_attribute( if (REG(DP_MSA_MISC)) misc1 = REG_READ(DP_MSA_MISC); + /* For YCbCr420 and BT2020 Colorimetry Formats, VSC SDP shall be used. + * When MISC1, bit 6, is Set to 1, a Source device uses a VSC SDP to indicate the + * Pixel Encoding/Colorimetry Format and that a Sink device shall ignore MISC1, bit 7, + * and MISC0, bits 7:1 (MISC1, bit 7, and MISC0, bits 7:1, become "don't care"). + */ + if (use_vsc_sdp_for_colorimetry) + misc1 = misc1 | 0x40; + else + misc1 = misc1 & ~0x40; + /* set color depth */ switch (hw_crtc_timing.display_color_depth) { @@ -499,6 +508,10 @@ static void dce110_stream_encoder_dp_set_stream_attribute( hw_crtc_timing.h_addressable + hw_crtc_timing.h_border_right, DP_MSA_VHEIGHT, hw_crtc_timing.v_border_top + hw_crtc_timing.v_addressable + hw_crtc_timing.v_border_bottom); + } else { + /* DCE-only path */ + if (REG(DP_MSA_MISC)) + REG_WRITE(DP_MSA_MISC, misc1); /* MSA_MISC1 */ } } diff --git a/drivers/gpu/drm/amd/display/dc/dce/dce_stream_encoder.h b/drivers/gpu/drm/amd/display/dc/dce/dce_stream_encoder.h index 342c0afe6a94..88d6044904d1 100644 --- a/drivers/gpu/drm/amd/display/dc/dce/dce_stream_encoder.h +++ b/drivers/gpu/drm/amd/display/dc/dce/dce_stream_encoder.h @@ -96,7 +96,8 @@ #define SE_COMMON_REG_LIST(id)\ SE_COMMON_REG_LIST_DCE_BASE(id), \ - SRI(AFMT_CNTL, DIG, id) + SRI(AFMT_CNTL, DIG, id), \ + SRI(DP_MSA_MISC, DP, id) #define SE_DCN_REG_LIST(id)\ SE_COMMON_REG_LIST_BASE(id),\ -- 2.54.0
