From: Sai Prakash Ranjan Date: Fri, 16 Oct 2020 10:10:25 +0000 (+0530) Subject: coresight: etm4x: Skip setting LPOVERRIDE bit for qcom,skip-power-up X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=4e96d5cc25f398e2b085091bb5d94c01f6d66c8d;p=users%2Fhch%2Fblock.git coresight: etm4x: Skip setting LPOVERRIDE bit for qcom,skip-power-up 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 Reviewed-by: Suzuki K Poulose Signed-off-by: Mathieu Poirier --- 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;