diff mbox series

[10/17] coresight: etmv4: Counter values not saved on disable

Message ID 20200716175746.3338735-11-mathieu.poirier@linaro.org (mailing list archive)
State Mainlined
Commit 8fa43700f69703f995ea715b76be6fabdd2f05de
Headers show
Series coresight: next v5.8-rc5 | expand

Commit Message

Mathieu Poirier July 16, 2020, 5:57 p.m. UTC 
From: Mike Leach <mike.leach@linaro.org>

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>
---
 drivers/hwtracing/coresight/coresight-etm4x.c | 6 ++++++
 1 file changed, 6 insertions(+)
diff mbox series

Patch

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);