drm/i915/mst: Read out FEC state

The MST codepath is missing FEC readout. Add it.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230502143906.2401-4-ville.syrjala@linux.intel.com
Reviewed-by: Luca Coelho <luciano.coelho@intel.com>

diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index 690e1e02aba80aa1009580ca14324db1f76fdf5a..4794beeeba9a39a11c35a3f0478af2a9f4aa668d 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -3762,6 +3762,11 @@ static void intel_ddi_read_func_ctl(struct intel_encoder *encoder,
                intel_cpu_transcoder_get_m1_n1(crtc, cpu_transcoder,
                                               &pipe_config->dp_m_n);
 
+               if (DISPLAY_VER(dev_priv) >= 11)
+                       pipe_config->fec_enable =
+                               intel_de_read(dev_priv,
+                                             dp_tp_ctl_reg(encoder, pipe_config)) & DP_TP_CTL_FEC_ENABLE;
+
                pipe_config->infoframes.enable |=
                        intel_hdmi_infoframes_enabled(encoder, pipe_config);
                break;