drm/i915: Allow 1 vblank to let Sink CRC calculation to start or stop.

According to VESA DP Spec, setting TEST_SINK_START (bit 0)
of TEST_SINK (00270h) "Stop/Start calculating CRC on the next frame"

So let's wait at least 1 vblank to really say the calculation
stopped or started.

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

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 9d90bc9..3ffedd8 100644 (file)
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -3949,6 +3949,7 @@ intel_dp_probe_mst(struct intel_dp *intel_dp)
 static int intel_dp_sink_crc_stop(struct intel_dp *intel_dp)
 {
        struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
+       struct drm_device *dev = dig_port->base.base.dev;
        struct intel_crtc *intel_crtc = to_intel_crtc(dig_port->base.base.crtc);
        u8 buf;
        int ret = 0;
@@ -3966,6 +3967,7 @@ static int intel_dp_sink_crc_stop(struct intel_dp *intel_dp)
                goto out;
        }
 
+       intel_wait_for_vblank(dev, intel_crtc->pipe);
        intel_dp->sink_crc.started = false;
  out:
        hsw_enable_ips(intel_crtc);
@@ -3975,6 +3977,7 @@ static int intel_dp_sink_crc_stop(struct intel_dp *intel_dp)
 static int intel_dp_sink_crc_start(struct intel_dp *intel_dp)
 {
        struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
+       struct drm_device *dev = dig_port->base.base.dev;
        struct intel_crtc *intel_crtc = to_intel_crtc(dig_port->base.base.crtc);
        u8 buf;
        int ret;
@@ -4004,6 +4007,7 @@ static int intel_dp_sink_crc_start(struct intel_dp *intel_dp)
                return -EIO;
        }
 
+       intel_wait_for_vblank(dev, intel_crtc->pipe);
        intel_dp->sink_crc.started = true;
        return 0;
 }