[Intel-gfx] [PATCH 1/4] drm/i915/tgl/dsi: Program TRANS_VBLANK register

[Vandita Kulkarni]

Program vblank register for mipi dsi in video mode
on TGL.

Signed-off-by: Vandita Kulkarni <vandita.kulkarni at intel.com>
---
 drivers/gpu/drm/i915/display/icl_dsi.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/icl_dsi.c b/drivers/gpu/drm/i915/display/icl_dsi.c
index b8673debf932..556eba2636fe 100644
--- a/drivers/gpu/drm/i915/display/icl_dsi.c
+++ b/drivers/gpu/drm/i915/display/icl_dsi.c
@@ -866,6 +866,15 @@ gen11_dsi_set_transcoder_timings(struct intel_encoder *encoder,
 		dsi_trans = dsi_port_to_transcoder(port);
 		I915_WRITE(VSYNCSHIFT(dsi_trans), vsync_shift);
 	}
+
+	/* program TRANS_VBLANK register, should be same as vtotal progammed */
+	if (INTEL_GEN(dev_priv) >= 12) {
+		for_each_dsi_port(port, intel_dsi->ports) {
+			dsi_trans = dsi_port_to_transcoder(port);
+			I915_WRITE(VBLANK(dsi_trans),
+				   (vactive - 1) | ((vtotal - 1) << 16));
+		}
+	}
 }
 
 static void gen11_dsi_enable_transcoder(struct intel_encoder *encoder)
-- 
2.21.0.5.gaeb582a