diff mbox series

[16/17] drm/i915/dg2: configure TRANS_DP2_VFREQ{HIGH, LOW} for 128b/132b

Message ID 00efac721babedb5efbd87d4817191b369f9283c.1629310010.git.jani.nikula@intel.com (mailing list archive)
State New, archived
Headers show
Series drm/i915/dp: dp 2.0 enabling prep work | expand

Commit Message

Jani Nikula Aug. 18, 2021, 6:10 p.m. UTC 
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@intel.com>
---
 drivers/gpu/drm/i915/display/intel_dp_mst.c | 11 +++++++++++
 1 file changed, 11 insertions(+)
diff mbox series

Patch

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,