If the panel supports FEC, the driver has to set the FEC_READY bit in the dpcd register: FEC_CONFIGURATION.
This has to happen before link training. v2: s/intel_dp_set_fec_ready/intel_dp_sink_set_fec_ready - change commit message. (Gaurav) v3: rebased. (r-b Manasi) v4: Use fec crtc state, before setting FEC_READY bit. (Anusha) v5: Move to intel_ddi.c - Make the function static (Anusha) v6: Dont pass state as a separate argument (Ville) Cc: dri-devel@lists.freedesktop.org Cc: Gaurav K Singh <gaurav.k.si...@intel.com> Cc: Jani Nikula <jani.nik...@linux.intel.com> Cc: Ville Syrjala <ville.syrj...@linux.intel.com> Cc: Manasi Navare <manasi.d.nav...@intel.com> Signed-off-by: Anusha Srivatsa <anusha.sriva...@intel.com> --- drivers/gpu/drm/i915/intel_ddi.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c index 46c1b9e12fbd..850c16200759 100644 --- a/drivers/gpu/drm/i915/intel_ddi.c +++ b/drivers/gpu/drm/i915/intel_ddi.c @@ -3051,6 +3051,16 @@ static void icl_program_mg_dp_mode(struct intel_digital_port *intel_dig_port) I915_WRITE(MG_DP_MODE(port, 1), ln1); } +static void intel_dp_sink_set_fec_ready(struct intel_dp *intel_dp, + const struct intel_crtc_state *crtc_state) +{ + if (!crtc_state->fec_enable) + return; + + if (drm_dp_dpcd_writeb(&intel_dp->aux, DP_FEC_CONFIGURATION, DP_FEC_READY) <= 0) + DRM_DEBUG_KMS("Failed to get FEC enabled in sink\n"); +} + static void intel_ddi_pre_enable_dp(struct intel_encoder *encoder, const struct intel_crtc_state *crtc_state, const struct drm_connector_state *conn_state) @@ -3091,6 +3101,7 @@ static void intel_ddi_pre_enable_dp(struct intel_encoder *encoder, intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_ON); intel_dp_sink_set_decompression_state(intel_dp, crtc_state, true); + intel_dp_sink_set_fec_ready(intel_dp, crtc_state); intel_dp_start_link_train(intel_dp); if (port != PORT_A || INTEL_GEN(dev_priv) >= 9) intel_dp_stop_link_train(intel_dp); -- 2.19.1 _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel