On Mon, 18 Jan 2021, Ville Syrjala <ville.syrjala@xxxxxxxxxxxxxxx> wrote: > From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> > > Let's not enable the 4:4:4->4:2:0 conversion bit in the DFP unless we're > actually outputting YCbCr 4:4:4. It would appear some protocol > converters blindy consult this bit even when the source is outputting > RGB, resulting in a visual mess. > > Cc: stable@xxxxxxxxxxxxxxx > Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/2914 > Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx> > Link: https://patchwork.freedesktop.org/patch/msgid/20210111164111.13302-1-ville.syrjala@xxxxxxxxxxxxxxx > Fixes: 181567aa9f0d ("drm/i915: Do YCbCr 444->420 conversion via DP protocol converters") > Reviewed-by: Jani Nikula <jani.nikula@xxxxxxxxx> > (cherry picked from commit 3170a21f7059c4660c469f59bf529f372a57da5f) > --- > Unfortunately the crtc_state plumbing to > intel_dp_configure_protocol_converter() was part of the > HDMI 2.1 PCON stuff, so couldn't just cherry-pick it alone. Thanks, pushed to fixes. BR, Jani. > > drivers/gpu/drm/i915/display/intel_ddi.c | 2 +- > drivers/gpu/drm/i915/display/intel_dp.c | 9 +++++---- > drivers/gpu/drm/i915/display/intel_dp.h | 3 ++- > 3 files changed, 8 insertions(+), 6 deletions(-) > > diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c > index 92940a0c5ef8..d5ace48b1ace 100644 > --- a/drivers/gpu/drm/i915/display/intel_ddi.c > +++ b/drivers/gpu/drm/i915/display/intel_ddi.c > @@ -3725,7 +3725,7 @@ static void hsw_ddi_pre_enable_dp(struct intel_atomic_state *state, > intel_ddi_init_dp_buf_reg(encoder, crtc_state); > if (!is_mst) > intel_dp_set_power(intel_dp, DP_SET_POWER_D0); > - intel_dp_configure_protocol_converter(intel_dp); > + intel_dp_configure_protocol_converter(intel_dp, crtc_state); > intel_dp_sink_set_decompression_state(intel_dp, crtc_state, > true); > intel_dp_sink_set_fec_ready(intel_dp, crtc_state); > diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c > index 37f1a10fd021..09123e8625c4 100644 > --- a/drivers/gpu/drm/i915/display/intel_dp.c > +++ b/drivers/gpu/drm/i915/display/intel_dp.c > @@ -4014,7 +4014,8 @@ static void intel_dp_enable_port(struct intel_dp *intel_dp, > intel_de_posting_read(dev_priv, intel_dp->output_reg); > } > > -void intel_dp_configure_protocol_converter(struct intel_dp *intel_dp) > +void intel_dp_configure_protocol_converter(struct intel_dp *intel_dp, > + const struct intel_crtc_state *crtc_state) > { > struct drm_i915_private *i915 = dp_to_i915(intel_dp); > u8 tmp; > @@ -4033,8 +4034,8 @@ void intel_dp_configure_protocol_converter(struct intel_dp *intel_dp) > drm_dbg_kms(&i915->drm, "Failed to set protocol converter HDMI mode to %s\n", > enableddisabled(intel_dp->has_hdmi_sink)); > > - tmp = intel_dp->dfp.ycbcr_444_to_420 ? > - DP_CONVERSION_TO_YCBCR420_ENABLE : 0; > + tmp = crtc_state->output_format == INTEL_OUTPUT_FORMAT_YCBCR444 && > + intel_dp->dfp.ycbcr_444_to_420 ? DP_CONVERSION_TO_YCBCR420_ENABLE : 0; > > if (drm_dp_dpcd_writeb(&intel_dp->aux, > DP_PROTOCOL_CONVERTER_CONTROL_1, tmp) != 1) > @@ -4088,7 +4089,7 @@ static void intel_enable_dp(struct intel_atomic_state *state, > } > > intel_dp_set_power(intel_dp, DP_SET_POWER_D0); > - intel_dp_configure_protocol_converter(intel_dp); > + intel_dp_configure_protocol_converter(intel_dp, pipe_config); > intel_dp_start_link_train(intel_dp, pipe_config); > intel_dp_stop_link_train(intel_dp, pipe_config); > > diff --git a/drivers/gpu/drm/i915/display/intel_dp.h b/drivers/gpu/drm/i915/display/intel_dp.h > index b871a09b6901..05f7ddf7a795 100644 > --- a/drivers/gpu/drm/i915/display/intel_dp.h > +++ b/drivers/gpu/drm/i915/display/intel_dp.h > @@ -51,7 +51,8 @@ int intel_dp_get_link_train_fallback_values(struct intel_dp *intel_dp, > int intel_dp_retrain_link(struct intel_encoder *encoder, > struct drm_modeset_acquire_ctx *ctx); > void intel_dp_set_power(struct intel_dp *intel_dp, u8 mode); > -void intel_dp_configure_protocol_converter(struct intel_dp *intel_dp); > +void intel_dp_configure_protocol_converter(struct intel_dp *intel_dp, > + const struct intel_crtc_state *crtc_state); > void intel_dp_sink_set_decompression_state(struct intel_dp *intel_dp, > const struct intel_crtc_state *crtc_state, > bool enable); -- Jani Nikula, Intel Open Source Graphics Center
