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drm/i915: Only enable DFP 4:4:4->4:2:0 conversion when outputting YCbCr 4:4:4

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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.syrjala@linux.intel.com
Fixes: 181567aa9f ("drm/i915: Do YCbCr 444->420 conversion via DP protocol converters")
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
(cherry picked from commit 3170a21f70)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210118154355.24453-1-ville.syrjala@linux.intel.com
This commit is contained in:
Ville Syrjälä 2021-01-18 17:43:55 +02:00 committed by Jani Nikula
parent 45db630e5f
commit 1c4995b0a5
3 changed files with 8 additions and 6 deletions
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2
drivers/gpu/drm/i915/display/intel_ddi.c
View file

@ -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);

9
drivers/gpu/drm/i915/display/intel_dp.c
View file

@ -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);

3
drivers/gpu/drm/i915/display/intel_dp.h
View file

@ -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);