linux-kernel - [PATCH 1/7] drm/dp_helper: Print first error received on failure in drm_dp_dpcd

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Date:	Fri,  5 Aug 2016 20:30:33 -0400
From:	Lyude <cpaul@...hat.com>
To:	dri-devel@...ts.freedesktop.org, amd-gfx@...ts.freedesktop.org,
	xorg-driver-ati@...ts.freedesktop.org
Cc:	Lyude <cpaul@...hat.com>, David Airlie <airlied@...ux.ie>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 1/7] drm/dp_helper: Print first error received on failure in drm_dp_dpcd_access()

Since we always retry in drm_dp_dpcd_access() regardless of the error,
we're going to make a lot of noise if the aux->transfer function prints
it's own errors (as is the case with radeon). If we can print the error
code here, this reduces the need for drivers to do this. So instead of
having to print "dp_aux_ch timed out" over 32 times we can just print
once.

Signed-off-by: Lyude <cpaul@...hat.com>
---
 drivers/gpu/drm/drm_dp_helper.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
index 8f11b87..43be189 100644
--- a/drivers/gpu/drm/drm_dp_helper.c
+++ b/drivers/gpu/drm/drm_dp_helper.c
@@ -223,7 +223,7 @@ static int drm_dp_dpcd_access(struct drm_dp_aux *aux, u8 request,
 			err = ret;
 	}
 
-	DRM_DEBUG_KMS("too many retries, giving up\n");
+	DRM_DEBUG_KMS("Too many retries, giving up. First error: %d\n", err);
 	ret = err;
 
 unlock:
-- 
2.7.4