drm/dp_helper: Rate limit timeout errors from drm_dp_i2c_do_msg()

Timeouts can be errors, but timeouts are also usually normal behavior
and happen a lot. Since the kernel already lets us know when we're
suppressing messages due to rate limiting, rate limit timeout errors so
we don't make too much noise in the kernel log.

Signed-off-by: Lyude <cpaul@redhat.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: http://patchwork.freedesktop.org/patch/msgid/1470443443-27252-8-git-send-email-cpaul@redhat.com

diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
index 198e9e22f72b40eb7c52f83f0906faed4d295bea..5d20255f3db39fb76a6997477fb325781ebd6a78 100644 (file)
--- a/drivers/gpu/drm/drm_dp_helper.c
+++ b/drivers/gpu/drm/drm_dp_helper.c
@@ -574,7 +574,17 @@ static int drm_dp_i2c_do_msg(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg)
                        if (ret == -EBUSY)
                                continue;
 
-                       DRM_DEBUG_KMS("transaction failed: %d\n", ret);
+                       /*
+                        * While timeouts can be errors, they're usually normal
+                        * behavior (for instance, when a driver tries to
+                        * communicate with a non-existant DisplayPort device).
+                        * Avoid spamming the kernel log with timeout errors.
+                        */
+                       if (ret == -ETIMEDOUT)
+                               DRM_DEBUG_KMS_RATELIMITED("transaction timed out\n");
+                       else
+                               DRM_DEBUG_KMS("transaction failed: %d\n", ret);
+
                        return ret;
                }