linux-kernel - [PATCH] drm: dpcd: Print more useful information during error

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Message-Id: <20200409195200.5483-1-mail@aurabindo.in>
Date:   Thu,  9 Apr 2020 15:52:00 -0400
From:   Aurabindo Pillai <mail@...abindo.in>
To:     maarten.lankhorst@...ux.intel.com, mripard@...nel.org,
        airlied@...ux.ie, daniel@...ll.ch
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH] drm: dpcd: Print more useful information during error

When DPCD access errors occur, knowing the register and request
associated with the error helps debugging, so print the
details in the debug message.

Signed-off-by: Aurabindo Pillai <mail@...abindo.in>
---
 drivers/gpu/drm/drm_dp_helper.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
index a5364b519..545606aac 100644
--- a/drivers/gpu/drm/drm_dp_helper.c
+++ b/drivers/gpu/drm/drm_dp_helper.c
@@ -257,7 +257,9 @@ static int drm_dp_dpcd_access(struct drm_dp_aux *aux, u8 request,
 			err = ret;
 	}
 
-	DRM_DEBUG_KMS("Too many retries, giving up. First error: %d\n", err);
+	DRM_DEBUG_KMS("dpcd: Too many retries, giving up. First error: %d\t"
+		      "address: %x\trequest: %x\t size:%zu\n",
+		      err, msg.address, msg.request, msg.size);
 	ret = err;
 
 unlock:
-- 
2.26.0