drm/i915: implement workaround for VTOTAL when using TRANSCODER_EDP

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.

V2: Use I915_READ as suggested by Daniel Vetter.

Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 0f3187c516c5..a5be34664299 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -4524,6 +4524,14 @@ 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), I915_READ(VTOTAL(cpu_transcoder)));
+
         /* pipesrc controls the size that is scaled from, which should
          * always be the user's requested size.
          */