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authorSai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>2020-11-27 10:52:42 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2020-11-27 20:23:11 +0100
commitac0f82b1b4956e348a6b2de8104308144ffb6ef7 (patch)
treeab91cbceff29c68590c1a12b724c228ad023433e /drivers
parent3311bf18467272388039922a5e29c4925b291f73 (diff)
downloadlinux-ac0f82b1b4956e348a6b2de8104308144ffb6ef7.tar.bz2
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") Cc: stable@vger.kernel.org Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com> Signed-off-by: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org> Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> Link: https://lore.kernel.org/r/20201127175256.1092685-2-mathieu.poirier@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/hwtracing/coresight/coresight-etm4x-core.c2
1 files changed, 1 insertions, 1 deletions
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;