From: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>
To: Mathieu Poirier <mathieu.poirier@linaro.org>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Mike Leach <mike.leach@linaro.org>
Cc: coresight@lists.linaro.org, Stephen Boyd <swboyd@chromium.org>,
denik@chromium.org, linux-arm-msm@vger.kernel.org,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>
Subject: [PATCH] coresight: etm4x: Skip setting LPOVERRIDE bit for qcom,skip-power-up
Date: Fri, 16 Oct 2020 15:40:25 +0530 [thread overview]
Message-ID: <20201016101025.26505-1-saiprakash.ranjan@codeaurora.org> (raw)
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.
Fixes: 02510a5aa78d ("coresight: etm4x: Add support to skip trace unit power up")
Signed-off-by: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.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;
base-commit: 3477326277451000bc667dfcc4fd0774c039184c
--
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
of Code Aurora Forum, hosted by The Linux Foundation
next reply other threads:[~2020-10-16 10:11 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-16 10:10 Sai Prakash Ranjan [this message]
2020-10-16 11:21 ` [PATCH] coresight: etm4x: Skip setting LPOVERRIDE bit for qcom,skip-power-up Suzuki Poulose
2020-10-16 11:47 ` Sai Prakash Ranjan
2020-10-16 13:15 ` Suzuki Poulose
2020-10-16 13:40 ` Sai Prakash Ranjan
2020-10-16 16:31 ` Mathieu Poirier
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