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SubjectRe: [PATCH] dmaengine: qcom: bam_dma: check if the runtime pm enabled
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On 17/05/18 06:21, Vinod wrote:
> On 14-05-18, 17:18, Srinivas Kandagatla wrote:
>> Disabling pm runtime at probe is not sufficient to get BAM working
>> on remotely controller instances. pm_runtime_get_sync() would return
>> -EACCES in such cases.
>> So check if runtime pm is enabled before returning error from bam functions.
>>
>> Fixes: 5b4a68952a89 ("dmaengine: qcom: bam_dma: disable runtime pm on remote controlled")
>> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
>> ---
>> drivers/dma/qcom/bam_dma.c | 10 +++++-----
>> 1 file changed, 5 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/dma/qcom/bam_dma.c b/drivers/dma/qcom/bam_dma.c
>> index d29275b97e84..5f4babebc508 100644
>> --- a/drivers/dma/qcom/bam_dma.c
>> +++ b/drivers/dma/qcom/bam_dma.c
>> @@ -540,7 +540,7 @@ static void bam_free_chan(struct dma_chan *chan)
>> int ret;
>>
>> ret = pm_runtime_get_sync(bdev->dev);
>> - if (ret < 0)
>> + if (pm_runtime_enabled(bdev->dev) && ret < 0)
>
> would it make sense to first check enabled and do _get_sync()
>
Both of them check the disable_depth, however doing it the way you
suggested would avoid some additional calls.

> if (pm_runtime_enabled()) {
> ret = pm_runtime_get_sync() {
> ...
> }
> }
sound like good idea!
>
Just noticed that some of the drivers use:

err = pm_runtime_get_sync(dev);
if (err < 0 && err !=-EACCES)
return;

others warp up this into local function.

Will send a v2!


thanks,
srini

> thus making clear in code that we do calls only when it is enabled. Also you can
> add a local macro for this code and use that rather than copy pasting :)
>

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