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coresight: cti: Add PM runtime call in enable_store

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[ 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>
This commit is contained in:
Mao Jinlong
2023-01-10 11:07:35 +00:00
committed by Greg Kroah-Hartman
parent ec48080254
commit 950c6df6ec
1 changed files with 11 additions and 2 deletions
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13
drivers/hwtracing/coresight/coresight-cti-sysfs.c
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@@ -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;