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@xxxxxxxxx>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx>
---
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
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