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Message-ID: <91bd54ff-f1e3-aa6b-8446-ad73916be6a7@arm.com>
Date: Mon, 9 Jan 2023 16:47:12 +0000
From: Suzuki K Poulose <suzuki.poulose@....com>
To: James Clark <james.clark@....com>, coresight@...ts.linaro.org,
quic_jinlmao@...cinc.com, mike.leach@...aro.org
Cc: Mathieu Poirier <mathieu.poirier@...aro.org>,
Leo Yan <leo.yan@...aro.org>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/3] coresight: cti: Add PM runtime call in
enable_store
On 06/01/2023 15:23, James Clark wrote:
> From: Mao Jinlong <quic_jinlmao@...cinc.com>
>
> 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@...cinc.com>
> [Change to only call pm_runtime_put if a disable happened]
> Signed-off-by: James Clark <james.clark@....com>
> ---
> drivers/hwtracing/coresight/coresight-cti-sysfs.c | 13 +++++++++++--
> 1 file 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;
Looks good to me.
@Mao Jinolong,
Are you able to test the patches 1 & 2 and confirm they solve your issue ?
Suzuki
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