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

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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
This commit is contained in:
Lyude 2016-08-05 20:30:39 -04:00 committed by Daniel Vetter
parent 29f21e0491
commit 9622c38f1c
1 changed files with 11 additions and 1 deletions
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12
drivers/gpu/drm/drm_dp_helper.c
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@ -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;
}