[Intel-gfx] [PATCH] drm/i915: Show debugfs dpcd read failure directly

[Rodrigo Vivi]

Instead of using a backchannel if some dpcd read failed we
can show that directly on debugfs output.

We are not returning an error because we might still want
to know if sub-sequent reads works, but we shouldn't
need to check 2 places to see why reg is not on the list.

Cc: Jani Nikula <jani.nikula at intel.com>
Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan at intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi at intel.com>
---
 drivers/gpu/drm/i915/i915_debugfs.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 59dc0610ea44..5d8da4e8c444 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -4846,8 +4846,8 @@ static int i915_dpcd_show(struct seq_file *m, void *data)
 
 		err = drm_dp_dpcd_read(&intel_dp->aux, b->offset, buf, size);
 		if (err <= 0) {
-			DRM_ERROR("dpcd read (%zu bytes at %u) failed (%zd)\n",
-				  size, b->offset, err);
+			seq_printf(m, "dpcd read (%zu bytes at %u) failed (%zd)\n",
+				   size, b->offset, err);
 			continue;
 		}
 
-- 
2.17.1