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authorMathieu Poirier <mathieu.poirier@linaro.org>2019-04-25 13:52:53 -0600
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-04-25 22:00:16 +0200
commit8013f32a1b352f810cc2acfb00317df2ae3c5dee (patch)
tree850d83f24d6e3fbf5647494cc84852e1f8816b3a /drivers/hwtracing
parent82500a810ee26ac542d128499d7adae163e61adb (diff)
coresight: etm4x: Skip selector pair 0
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>
Diffstat (limited to 'drivers/hwtracing')
-rw-r--r--drivers/hwtracing/coresight/coresight-etm4x.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c
index 732ae12fca9b..d64192c29860 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x.c
+++ b/drivers/hwtracing/coresight/coresight-etm4x.c
@@ -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));