[PATCH 5.10 146/199] drm/i915: Only enable DFP 4:4:4->4:2:0 conversion when outputting YCbCr 4:4:4

Greg Kroah-Hartman
2021-01-26T09:55:17Z

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

commit 1c4995b0a576d24bb7ead991fb037c8b47ab6e32 upstream.

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: 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)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210118154355.24453-1-ville.syrjala@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
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(-)

--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -3470,7 +3470,7 @@ static void hsw_ddi_pre_enable_dp(struct
intel_ddi_init_dp_buf_reg(encoder);
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);
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -3856,7 +3856,8 @@ static void intel_dp_enable_port(struct
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;
@@ -3875,8 +3876,8 @@ void intel_dp_configure_protocol_convert
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)
@@ -3930,7 +3931,7 @@ static void intel_enable_dp(struct intel
}

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);
intel_dp_stop_link_train(intel_dp);

--- 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_val
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);