coresight: etm4x: Add necessary synchronization for sysreg access

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As per the specification any update to the TRCPRGCTLR must be synchronized
by a context synchronization event (in our case an explicist ISB) before
the TRCSTATR is checked.

Link: https://lore.kernel.org/r/20210110224850.1880240-22-suzuki.poulose@arm.com
Cc: Mike Leach <mike.leach@linaro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Link: https://lore.kernel.org/r/20210201181351.1475223-24-mathieu.poirier@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Suzuki K Poulose 2021-02-01 11:13:43 -07:00 • committed by Greg Kroah-Hartman

parent 4211bfce1e

commit 1ab3bb9df5

1 changed files with 13 additions and 0 deletions

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drivers/hwtracing/coresight/coresight-etm4x-core.c

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