From a82fdcbe7ab39c49ea089a8d01f01e515b9d83bc Mon Sep 17 00:00:00 2001 From: Anusha Srivatsa Date: Wed, 28 Nov 2018 12:26:26 -0800 Subject: [PATCH] drm/i915/fec: Set FEC_READY in FEC_CONFIGURATION 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) v7: (From Manasi) * Correct the debug print (Ville) Cc: dri-devel@lists.freedesktop.org Cc: Gaurav K Singh Cc: Jani Nikula Cc: Ville Syrjala Cc: Manasi Navare Signed-off-by: Anusha Srivatsa Signed-off-by: Manasi Navare Reviewed-by: Manasi Navare Link: https://patchwork.freedesktop.org/patch/msgid/20181128202628.20238-15-manasi.d.navare@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 6533624226a73..4c74bbe1cf738 100644 --- a/drivers/gpu/drm/i915/intel_ddi.c +++ b/drivers/gpu/drm/i915/intel_ddi.c @@ -3102,6 +3102,16 @@ 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 set FEC_READY in the 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) @@ -3142,6 +3152,7 @@ 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); -- 2.39.5