diff mbox series

[2/3] coresight: etmv4: Counter values not saved on disable.

Message ID 20200616093333.31283-3-mike.leach@linaro.org (mailing list archive)
State New, archived
Headers show
Series coresight: minor fixes for CoreSight and ETMv4 | expand

Commit Message

Mike Leach June 16, 2020, 9:33 a.m. UTC 
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 mbox series

Patch

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);