coresight tmc: Support for save-restore in ETR

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The Coresight SoC 600 TMC ETR supports save-restore feature,
where the values of the RRP/RWP and STS.Full are retained
when it leaves the Disabled state. Hence, we must program the
RRP/RWP and STS.Full to a proper value. For now, set the RRP/RWP
to the base address of the buffer and clear the STS.Full register.
This can be later exploited for proper save-restore of ETR
trace contexts (e.g, perf).

Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Suzuki K Poulose 2017-08-02 10:22:16 -06:00 • committed by Greg Kroah-Hartman

parent ebab6a7db2

commit f2e931a2de

2 changed files with 21 additions and 1 deletions

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13

drivers/hwtracing/coresight/coresight-tmc-etr.c

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9

drivers/hwtracing/coresight/coresight-tmc.h

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