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drm/i915: Spam less on dp aux send/receive problems

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If we encounter frequent problems with dp aux channel
communications, we end up spamming the dmesg with the
exact similar trace and status.

Inject a new backtrace only if we have new information
to share as otherwise we flush out all other important
stuff.

Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Mika Kuoppala 2015-08-06 16:48:58 +03:00 committed by Daniel Vetter
parent 842315ee7e
commit 02196c776e
1 changed files with 9 additions and 2 deletions
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11
drivers/gpu/drm/i915/intel_dp.c
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@ -849,8 +849,15 @@ intel_dp_aux_ch(struct intel_dp *intel_dp,
}
if (try == 3) {
WARN(1, "dp_aux_ch not started status 0x%08x\n",
I915_READ(ch_ctl));
static u32 last_status = -1;
const u32 status = I915_READ(ch_ctl);
if (status != last_status) {
WARN(1, "dp_aux_ch not started status 0x%08x\n",
status);
last_status = status;
}
ret = -EBUSY;
goto out;
}