Set the DP 2.0 128b/132b channel encoding for UHBR rates.
Bspec: 54128
Reviewed-by: Manasi Navare <manasi.d.navare@xxxxxxxxx>
Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_ddi.c | 17 ++++++++++++++++-
1 file changed, 16 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index 203a54f905f6..8b8f5d679b72 100644
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -407,6 +407,20 @@ 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 (crtc_state->port_clock > 1000000)
+ 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.
*
@@ -2375,7 +2389,8 @@ 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
--
2.20.1
