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Date:   Wed, 23 Dec 2020 16:33:20 +0100
From:   Greg Kroah-Hartman <>
Cc:     Greg Kroah-Hartman <>,, Suzuki K Poulose <>,
        Sai Prakash Ranjan <>,
        Mathieu Poirier <>
Subject: [PATCH 5.10 19/40] coresight: etm4x: Skip setting LPOVERRIDE bit for qcom, skip-power-up

From: Sai Prakash Ranjan <>

commit ac0f82b1b4956e348a6b2de8104308144ffb6ef7 upstream.

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")
Reviewed-by: Suzuki K Poulose <>
Signed-off-by: Sai Prakash Ranjan <>
Signed-off-by: Mathieu Poirier <>
Signed-off-by: Greg Kroah-Hartman <>

 drivers/hwtracing/coresight/coresight-etm4x-core.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- 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 *in
 	 * 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;
 		drvdata->lpoverride = false;

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