From: Paulo Zanoni <paulo.r.zanoni at intel.com>
See the documentation for the DDI_FUNC_CTL register, EDP Input Select
bits: when the EDP input selection is B, the VTOTAL_B must be
programmed with the VTOTAL_EDP value, same thing for selection C.
Signed-off-by: Paulo Zanoni <paulo.r.zanoni at intel.com>
---
drivers/gpu/drm/i915/intel_display.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 9202cb6..cc859b3 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -4376,6 +4376,17 @@ static void intel_set_pipe_timings(struct intel_crtc *intel_crtc,
(adjusted_mode->crtc_vsync_start - 1) |
((adjusted_mode->crtc_vsync_end - 1) << 16));
+ /* Workaround: when the EDP input selection is B, the VTOTAL_B must be
+ * programmed with the VTOTAL_EDP value. Same for VTOTAL_C. This is
+ * documented on the DDI_FUNC_CTL register description, EDP Input Select
+ * bits. */
+ if (IS_HASWELL(dev) && cpu_transcoder == TRANSCODER_EDP &&
+ (pipe == PIPE_B || pipe == PIPE_C)) {
+ I915_WRITE(VTOTAL(pipe),
+ (adjusted_mode->crtc_vdisplay - 1) |
+ ((adjusted_mode->crtc_vtotal - 1) << 16));
+ }
+
/* pipesrc controls the size that is scaled from, which should
* always be the user's requested size.
*/
--
1.7.11.4
