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    Subject[PATCH 15/32] coresight: etm4x: Skip selector pair 0
    Date
    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>
    ---
    drivers/hwtracing/coresight/coresight-etm4x.c | 7 +++++--
    1 file 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));

    --
    2.17.1
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