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| author | Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org> | 2020-11-27 10:52:42 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-11-27 20:23:11 +0100 |
| commit | ac0f82b1b4956e348a6b2de8104308144ffb6ef7 (patch) | |
| tree | ab91cbceff29c68590c1a12b724c228ad023433e /drivers/hwtracing | |
| parent | 3311bf18467272388039922a5e29c4925b291f73 (diff) | |
| download | linux-ac0f82b1b4956e348a6b2de8104308144ffb6ef7.tar.gz | |
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/hwtracing')
| -rw-r--r-- | drivers/hwtracing/coresight/coresight-etm4x-core.c | 2 |
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; |