From: Sai Prakash Ranjan <saiprakash.ran...@codeaurora.org>
There is a bug on the systems supporting to skip power up
(qcom,skip-power-up) where setting LPOVERRIDE bit(low-power
state override behaviour) will result in CPU hangs/lockups
even on the implementations which supports it. So skip
setting the LPOVERRIDE bit for such platforms.
Cc: sta...@vger.kernel.org
Fixes: 02510a5aa78d ("coresight: etm4x: Add support to skip trace unit power
up")
Signed-off-by: Sai Prakash Ranjan <saiprakash.ran...@codeaurora.org>
Reviewed-by: Suzuki K Poulose <suzuki.poul...@arm.com>
Signed-off-by: Mathieu Poirier <mathieu.poir...@linaro.org>
---
drivers/hwtracing/coresight/coresight-etm4x-core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/hwtracing/coresight/coresight-etm4x-core.c
b/drivers/hwtracing/coresight/coresight-etm4x-core.c
index abd706b216ac..6096d7abf80d 100644
--- a/drivers/hwtracing/coresight/coresight-etm4x-core.c
+++ b/drivers/hwtracing/coresight/coresight-etm4x-core.c
@@ -779,7 +779,7 @@ static void etm4_init_arch_data(void *info)
* LPOVERRIDE, bit[23] implementation supports
* low-power state override
*/
- if (BMVAL(etmidr5, 23, 23))
+ if (BMVAL(etmidr5, 23, 23) && (!drvdata->skip_power_up))
drvdata->lpoverride = true;
else
drvdata->lpoverride = false;
--
2.25.1
