[Intel-gfx] [PATCH] drm/i915: Use dpcd read wake for sink crc calls.

[Jindal, Sonika]

So, sink crc during psr works now?
Great, I will give a try with this patch..

Regards,
Sonika

-----Original Message-----
From: Vivi, Rodrigo 
Sent: Friday, August 21, 2015 4:53 AM
To: intel-gfx at lists.freedesktop.org
Cc: Vivi, Rodrigo; Antognolli, Rafael; Jindal, Sonika
Subject: [PATCH] drm/i915: Use dpcd read wake for sink crc calls.

Let's use a native read with retry as suggested per spec to fix Sink CRC on SKL when PSR is enabled.

With PSR enabled panel is probably taking more time to wake and dpcd read is faling.

v2: Fix my email domain on commit message. Thanks Rafael.

Cc: Rafael Antognolli <rafael.antognolli at intel.com>
Cc: Sonika Jindal <sonika.jindal at intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi at intel.com>
---
 drivers/gpu/drm/i915/intel_dp.c | 15 +++++++++------
 1 file changed, 9 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index d32ce48..34f5e33 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -4037,7 +4037,8 @@ static int intel_dp_sink_crc_stop(struct intel_dp *intel_dp)
 	u8 buf;
 	int ret = 0;
 
-	if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK, &buf) < 0) {
+	if (intel_dp_dpcd_read_wake(&intel_dp->aux, DP_TEST_SINK,
+				    &buf, 1) < 0) {
 		DRM_DEBUG_KMS("Sink CRC couldn't be stopped properly\n");
 		ret = -EIO;
 		goto out;
@@ -4069,7 +4070,8 @@ static int intel_dp_sink_crc_start(struct intel_dp *intel_dp)
 			return ret;
 	}
 
-	if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK_MISC, &buf) < 0)
+	if (intel_dp_dpcd_read_wake(&intel_dp->aux, DP_TEST_SINK_MISC,
+				    &buf, 1) < 0)
 		return -EIO;
 
 	if (!(buf & DP_TEST_CRC_SUPPORTED))
@@ -4077,7 +4079,7 @@ static int intel_dp_sink_crc_start(struct intel_dp *intel_dp)
 
 	intel_dp->sink_crc.last_count = buf & DP_TEST_COUNT_MASK;
 
-	if (drm_dp_dpcd_readb(&intel_dp->aux, DP_TEST_SINK, &buf) < 0)
+	if (intel_dp_dpcd_read_wake(&intel_dp->aux, DP_TEST_SINK, &buf, 1) < 
+0)
 		return -EIO;
 
 	hsw_disable_ips(intel_crtc);
@@ -4109,8 +4111,8 @@ int intel_dp_sink_crc(struct intel_dp *intel_dp, u8 *crc)
 	do {
 		intel_wait_for_vblank(dev, intel_crtc->pipe);
 
-		if (drm_dp_dpcd_readb(&intel_dp->aux,
-				      DP_TEST_SINK_MISC, &buf) < 0) {
+		if (intel_dp_dpcd_read_wake(&intel_dp->aux,
+					    DP_TEST_SINK_MISC, &buf, 1) < 0) {
 			ret = -EIO;
 			goto stop;
 		}
@@ -4123,7 +4125,8 @@ int intel_dp_sink_crc(struct intel_dp *intel_dp, u8 *crc)
 		if (count == 0)
 			intel_dp->sink_crc.last_count = 0;
 
-		if (drm_dp_dpcd_read(&intel_dp->aux, DP_TEST_CRC_R_CR, crc, 6) < 0) {
+		if (intel_dp_dpcd_read_wake(&intel_dp->aux, DP_TEST_CRC_R_CR,
+					    crc, 6) < 0) {
 			ret = -EIO;
 			goto stop;
 		}
--
2.4.3