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coresight: etm4x: Fix timestamp configuration when working from perf 

When using the ETM4x tracers from the perf interface two trace options are
available: cycle accurate and timestamp.

Enabling the timestamp feature is done by setting TRCCONFIGR.TS (bit 11).
The position of the timestamp bit in that register coincidentally happens
to be the same as what was chosen to enable timestamping from the 'mode'
sysFS entry.  The code does the right thing but the semantic is wrong.

This patch sets TRCCONFIGR.TS explicitly, as it is done from the sysFS
interface.  That way timestamps are set the same way from both perf and
sysFS and there is no misunderstanding as to what is intended.

Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Mathieu Poirier 2017-01-23 10:41:24 -07:00 committed by Greg Kroah-Hartman
parent ae3fabcda0
commit 27a7e2a72c
1 changed files with 2 additions and 1 deletions
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3
drivers/hwtracing/coresight/coresight-etm4x.c
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@ -222,7 +222,8 @@ static int etm4_parse_event_config(struct etmv4_drvdata *drvdata,
config->ccctlr = ETM_CYC_THRESHOLD_DEFAULT;
}
if (attr->config & BIT(ETM_OPT_TS))
config->cfg |= ETMv4_MODE_TIMESTAMP;
/* bit[11], Global timestamp tracing bit */
config->cfg |= BIT(11);
out:
return ret;