diff options
| author | Mike Leach <mike.leach@linaro.org> | 2020-07-16 20:57:39 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-07-21 16:48:39 +0300 |
| commit | 8fa43700f69703f995ea715b76be6fabdd2f05de (patch) | |
| tree | 45903efb73864f0419f14c6eb47dfc71b1d2a4dd /drivers/hwtracing | |
| parent | cb8bba907a4ff4ba42f1d245cb506d55829674b8 (diff) | |
| download | linux-8fa43700f69703f995ea715b76be6fabdd2f05de.tar.xz | |
coresight: etmv4: Counter values not saved on disable
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>
Fixes: 2e1cdfe184b52 ("coresight-etm4x: Adding CoreSight ETM4x driver")
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Link: https://lore.kernel.org/r/20200716175746.3338735-11-mathieu.poirier@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hwtracing')
| -rw-r--r-- | drivers/hwtracing/coresight/coresight-etm4x.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c index 2290f41f0074..2d732af8b3e7 100644 --- a/drivers/hwtracing/coresight/coresight-etm4x.c +++ b/drivers/hwtracing/coresight/coresight-etm4x.c @@ -511,6 +511,12 @@ 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); |