There's a new register pair for 128b/132b mode where you need to set the
pixel clock in Hz.
Bspec: 54128
Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_dp_mst.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c
index d104441344c0..a003cc98312b 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
@@ -550,6 +550,17 @@ static void intel_mst_enable_dp(struct intel_atomic_state *state,
clear_act_sent(encoder, pipe_config);
+ if (pipe_config->port_clock > 1000000) {
+ const struct drm_display_mode *adjusted_mode =
+ &pipe_config->hw.adjusted_mode;
+ u64 crtc_clock_hz = KHz(adjusted_mode->crtc_clock);
+
+ intel_de_write(dev_priv, TRANS_DP2_VFREQHIGH(pipe_config->cpu_transcoder),
+ TRANS_DP2_VFREQ_PIXEL_CLOCK(crtc_clock_hz >> 24));
+ intel_de_write(dev_priv, TRANS_DP2_VFREQLOW(pipe_config->cpu_transcoder),
+ TRANS_DP2_VFREQ_PIXEL_CLOCK(crtc_clock_hz & 0xffffff));
+ }
+
intel_ddi_enable_transcoder_func(encoder, pipe_config);
intel_de_rmw(dev_priv, TRANS_DDI_FUNC_CTL(trans), 0,
--
2.20.1
