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@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_dp.c | 11 +++++++++--
1 file changed, 9 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
index df7e2cf..6b2f7af 100644
--- a/drivers/gpu/drm/i915/intel_dp.c
+++ b/drivers/gpu/drm/i915/intel_dp.c
@@ -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;
}
--
2.1.4
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