diff options
author | Mao Jinlong | 2023-01-10 11:07:35 +0000 |
---|---|---|
committer | Greg Kroah-Hartman | 2023-03-10 09:33:31 +0100 |
commit | 1a31f1c5062d45bea149f383fb4a6c0a5a03d62b (patch) | |
tree | d26a27a2853d4eaaa70a056ccca6f0d7c0c5ab7e /drivers/hwtracing | |
parent | 431d8b2d1457cae42959447e272eb31e995be42b (diff) |
coresight: cti: Add PM runtime call in enable_store
[ Upstream commit eff674a9b86a6ffdd10c3af3863545acf7f1ce4f ]
In commit 6746eae4bbad ("coresight: cti: Fix hang in cti_disable_hw()")
PM runtime calls are removed from cti_enable_hw/cti_disable_hw. When
enabling CTI by writing enable sysfs node, clock for accessing CTI
register won't be enabled. Device will crash due to register access
issue. Add PM runtime call in enable_store to fix this issue.
Fixes: 6746eae4bbad ("coresight: cti: Fix hang in cti_disable_hw()")
Signed-off-by: Mao Jinlong <quic_jinlmao@quicinc.com>
[Change to only call pm_runtime_put if a disable happened]
Tested-by: Jinlong Mao <quic_jinlmao@quicinc.com>
Signed-off-by: James Clark <james.clark@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Link: https://lore.kernel.org/r/20230110110736.2709917-3-james.clark@arm.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/hwtracing')
-rw-r--r-- | drivers/hwtracing/coresight/coresight-cti-sysfs.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/drivers/hwtracing/coresight/coresight-cti-sysfs.c b/drivers/hwtracing/coresight/coresight-cti-sysfs.c index 6d59c815ecf5..71e7a8266bb3 100644 --- a/drivers/hwtracing/coresight/coresight-cti-sysfs.c +++ b/drivers/hwtracing/coresight/coresight-cti-sysfs.c @@ -108,10 +108,19 @@ static ssize_t enable_store(struct device *dev, if (ret) return ret; - if (val) + if (val) { + ret = pm_runtime_resume_and_get(dev->parent); + if (ret) + return ret; ret = cti_enable(drvdata->csdev); - else + if (ret) + pm_runtime_put(dev->parent); + } else { ret = cti_disable(drvdata->csdev); + if (!ret) + pm_runtime_put(dev->parent); + } + if (ret) return ret; return size; |