Commit 8fa43700 authored Jul 16, 2020 by Mike Leach Committed by Greg Kroah-Hartman Jul 21, 2020

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: 2e1cdfe1 ("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>

parent cb8bba90

drivers/hwtracing/coresight/coresight-etm4x.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -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);