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

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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>
This commit is contained in:
Rodrigo Vivi 2015-11-05 10:50:19 -08:00 committed by Daniel Vetter
parent a03bc7cd63
commit d72f9d919a
1 changed files with 4 additions and 0 deletions
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4
drivers/gpu/drm/i915/intel_dp.c
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@ -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;
}