[RFC v4 11/16] drm/i915/ddi: initialize 128b/132b SST DP2 VFREQ registers

[Jani Nikula]

Write the DP2 specific VFREQ registers.

This is preparation for enabling 128b/132b SST. This path is not
reachable yet.

Signed-off-by: Jani Nikula <jani.nikula at intel.com>
---
 drivers/gpu/drm/i915/display/intel_ddi.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index 64528ff8856e..91e6cd91e91f 100644
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -3467,8 +3467,20 @@ static void intel_ddi_enable(struct intel_atomic_state *state,
 {
 	struct intel_display *display = to_intel_display(encoder);
 	struct intel_crtc *pipe_crtc;
+	enum transcoder cpu_transcoder = crtc_state->cpu_transcoder;
 	int i;
 
+	/* 128b/132b SST */
+	if (intel_dp_is_uhbr(crtc_state)) {
+		const struct drm_display_mode *adjusted_mode = &crtc_state->hw.adjusted_mode;
+		u64 crtc_clock_hz = KHz(adjusted_mode->crtc_clock);
+
+		intel_de_write(display, TRANS_DP2_VFREQHIGH(cpu_transcoder),
+			       TRANS_DP2_VFREQ_PIXEL_CLOCK(crtc_clock_hz >> 24));
+		intel_de_write(display, TRANS_DP2_VFREQLOW(cpu_transcoder),
+			       TRANS_DP2_VFREQ_PIXEL_CLOCK(crtc_clock_hz & 0xffffff));
+	}
+
 	intel_ddi_enable_transcoder_func(encoder, crtc_state);
 
 	/* Enable/Disable DP2.0 SDP split config before transcoder */
-- 
2.39.5