coresight: tmc-etr: Check if non-secure access is enabled

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CoreSight TMC-ETR must have the non-secure invasive debug access
enabled for use by self-hosted tracing. Without it, there is no
point in enabling the ETR. So, let us check it in the TMC_AUTHSTATUS
register and fail the probe if it is disabled.

Cc: Mathieu Poirier <mathieu.poirier@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/20190829202842.580-7-mathieu.poirier@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Suzuki K Poulose 2019-08-29 14:28:31 -06:00 • committed by Greg Kroah-Hartman

parent f52ff9b7d6

commit 8a4bc4f195

2 changed files with 15 additions and 0 deletions

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12

drivers/hwtracing/coresight/coresight-tmc.c

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3

drivers/hwtracing/coresight/coresight-tmc.h

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