[Intel-gfx] [PATCH 1/5] drm/i915: Allow 1 vblank to let Sink CRC calculation to start or stop.

[Rodrigo Vivi]

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 at intel.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni at intel.com>
---
 drivers/gpu/drm/i915/intel_dp.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index 99b7f1d..3121be5 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -3843,6 +3843,7 @@ 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;
@@ -3860,6 +3861,7 @@ 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);
@@ -3869,6 +3871,7 @@ 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;
@@ -3898,6 +3901,7 @@ 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;
 }
-- 
2.4.3