On Mon, 18 Jan 2021, Ville Syrjala ville.syrjala@linux.intel.com wrote:

From: Ville Syrjälä ville.syrjala@linux.intel.com

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@vger.kernel.org Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/2914 Signed-off-by: Ville Syrjälä ville.syrjala@linux.intel.com Link: https://patchwork.freedesktop.org/patch/msgid/20210111164111.13302-1-ville.s... Fixes: 181567aa9f0d ("drm/i915: Do YCbCr 444->420 conversion via DP protocol converters") Reviewed-by: Jani Nikula jani.nikula@intel.com (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);