diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c index cb8f303265a7..91ee32ffba97 100644 --- a/drivers/gpu/drm/i915/display/intel_ddi.c +++ b/drivers/gpu/drm/i915/display/intel_ddi.c @@ -408,6 +408,20 @@ static u32 bdw_trans_port_sync_master_select(enum transcoder master_transcoder) return master_transcoder + 1; } +static void +intel_ddi_config_transcoder_dp2(struct intel_encoder *encoder, + const struct intel_crtc_state *crtc_state) +{ + struct drm_i915_private *i915 = to_i915(encoder->base.dev); + enum transcoder cpu_transcoder = crtc_state->cpu_transcoder; + u32 val = 0; + + if (intel_dp_is_uhbr(crtc_state)) + val = TRANS_DP2_128B132B_CHANNEL_CODING; + + intel_de_write(i915, TRANS_DP2_CTL(cpu_transcoder), val); +} + /* * Returns the TRANS_DDI_FUNC_CTL value based on CRTC state. * @@ -2376,7 +2390,8 @@ static void dg2_ddi_pre_enable_dp(struct intel_atomic_state *state, */ intel_ddi_enable_pipe_clock(encoder, crtc_state); - /* 5.b Not relevant to i915 for now */ + /* 5.b Configure transcoder for DP 2.0 128b/132b */ + intel_ddi_config_transcoder_dp2(encoder, crtc_state); /* * 5.c Configure TRANS_DDI_FUNC_CTL DDI Select, DDI Mode Select & MST