[PATCH 1/3] drm/i915/dsi: Fix off by one in BXT_MIPI_TRANS_VTOTAL

[Ville Syrjala]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

BXT_MIPI_TRANS_VTOTAL must be programmed with vtotal-1
instead of vtotal. Make it so.

Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/i915/display/vlv_dsi.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/vlv_dsi.c b/drivers/gpu/drm/i915/display/vlv_dsi.c
index af717df83197..661de51dfd22 100644
--- a/drivers/gpu/drm/i915/display/vlv_dsi.c
+++ b/drivers/gpu/drm/i915/display/vlv_dsi.c
@@ -1060,7 +1060,7 @@ static void bxt_dsi_get_pipe_config(struct intel_encoder *encoder,
 				              BXT_MIPI_TRANS_VACTIVE(port));
 	adjusted_mode->crtc_vtotal =
 				intel_de_read(display,
-				              BXT_MIPI_TRANS_VTOTAL(port));
+				              BXT_MIPI_TRANS_VTOTAL(port)) + 1;
 
 	hactive = adjusted_mode->crtc_hdisplay;
 	hfp = intel_de_read(display, MIPI_HFP_COUNT(display, port));
@@ -1265,7 +1265,7 @@ static void set_dsi_timings(struct intel_encoder *encoder,
 			intel_de_write(display, BXT_MIPI_TRANS_VACTIVE(port),
 				       adjusted_mode->crtc_vdisplay);
 			intel_de_write(display, BXT_MIPI_TRANS_VTOTAL(port),
-				       adjusted_mode->crtc_vtotal);
+				       adjusted_mode->crtc_vtotal - 1);
 		}
 
 		intel_de_write(display, MIPI_HACTIVE_AREA_COUNT(display, port),
-- 
2.45.3