The counter value registers change during operation, however this change is not reflected in the values seen by the user in sysfs.
This fixes the issue by reading back the values on disable.
Signed-off-by: Mike Leach mike.leach@linaro.org --- drivers/hwtracing/coresight/coresight-etm4x.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c index 747afc875f91..60a5133d801c 100644 --- a/drivers/hwtracing/coresight/coresight-etm4x.c +++ b/drivers/hwtracing/coresight/coresight-etm4x.c @@ -507,6 +507,12 @@ static void etm4_disable_hw(void *info) readl_relaxed(drvdata->base + TRCSSCSRn(i)); }
+ /* read back the current counter values */ + for (i = 0; i < drvdata->nr_cntr; i++) { + config->cntr_val[i] = + readl_relaxed(drvdata->base + TRCCNTVRn(i)); + } + coresight_disclaim_device_unlocked(drvdata->base);
CS_LOCK(drvdata->base);