diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 3ffedd897fffd..a2d26364f5082 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -3953,6 +3953,8 @@ static int intel_dp_sink_crc_stop(struct intel_dp *intel_dp) struct intel_crtc *intel_crtc = to_intel_crtc(dig_port->base.base.crtc); u8 buf; int ret = 0; + int count = 0; + int attempts = 10; if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK, &buf) < 0) { DRM_DEBUG_KMS("Sink CRC couldn't be stopped properly\n"); @@ -3967,7 +3969,22 @@ static int intel_dp_sink_crc_stop(struct intel_dp *intel_dp) goto out; } - intel_wait_for_vblank(dev, intel_crtc->pipe); + do { + intel_wait_for_vblank(dev, intel_crtc->pipe); + + if (drm_dp_dpcd_readb(&intel_dp->aux, + DP_TEST_SINK_MISC, &buf) < 0) { + ret = -EIO; + goto out; + } + count = buf & DP_TEST_COUNT_MASK; + } while (--attempts && count); + + if (attempts == 0) { + DRM_ERROR("TIMEOUT: Sink CRC counter is not zeroed\n"); + ret = -ETIMEDOUT; + } + intel_dp->sink_crc.started = false; out: hsw_enable_ips(intel_crtc);