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UPSTREAM: coresight: etm4x: Skip selector pair 0

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(Upstream commit 8013f32a1b).

Resource selector pair 0 is always implemented and reserved.  As such
it should not be explicitly programmed.

Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Tested-by: Leo Yan <leo.yan@linaro.org>
Tested-by: Robert Walker <robert.walker@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Bug: 140266694
Change-Id: I1cb310ecc59adf849980c5cb757e8f8032f5ba35
Signed-off-by: Yabin Cui <yabinc@google.com>
This commit is contained in:
Mathieu Poirier
2019-04-25 13:52:53 -06:00
committed by Yabin Cui
parent 5351ad941a
commit 3e93855282
1 changed files with 5 additions and 2 deletions
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7
drivers/hwtracing/coresight/coresight-etm4x.c
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@@ -138,8 +138,11 @@ static int etm4_enable_hw(struct etmv4_drvdata *drvdata)
drvdata->base + TRCCNTVRn(i));
}
/* Resource selector pair 0 is always implemented and reserved */
for (i = 0; i < drvdata->nr_resource * 2; i++)
/*
* Resource selector pair 0 is always implemented and reserved. As
* such start at 2.
*/
for (i = 2; i < drvdata->nr_resource * 2; i++)
writel_relaxed(config->res_ctrl[i],
drvdata->base + TRCRSCTLRn(i));