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Re: [PATCH 1/2] mmc: enable mmc host device to suspend/resume asynchronously

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  Re: [PATCH 1/2] mmc: enable mmc host device to suspend/resume  asynchronously "Fu, Zhonghui" <zhonghui.fu@linux.intel.com> - 2016-01-22 04:40 +0100

#1314732 — Re: [PATCH 1/2] mmc: enable mmc host device to suspend/resume asynchronously

On 1/12/2016 10:42 PM, Ulf Hansson wrote:
> On 28 December 2015 at 16:39, Fu, Zhonghui <zhonghui.fu@linux.intel.com> wrote:
>> Now, PM core supports asynchronous suspend/resume mode for devices
>> during system suspend/resume, and the power state transition of one
>> device may be completed in separate kernel thread. PM core ensures
>> all power state transition dependency between devices. This patch
>> enables mmc hosts to suspend/resume asynchronously. This will take
>> advantage of multicore and improve system suspend/resume speed.
>> After applying this patch and enabling all mmc hosts' child devices
>> to suspend/resume asynchronously on ASUS T100TA, the system
>> suspend-to-idle time is reduced from 1645ms to 1107ms, and the
>> system resume time is reduced from 940ms to 914ms.
> Please update the  change log as I don't think the above is really correct.
>
> I think you can simplify the change log quite a bit and just mention
> what and why we want this change.

I have updated the change log according to your comments and resent this patch - "[PATCH 1/2 v2] mmc: enable mmc host device to suspend/resume asynchronously".


Thanks,
Zhonghui
>
>> Signed-off-by: Zhonghui Fu <zhonghui.fu@linux.intel.com>
>> ---
>>  drivers/mmc/core/host.c |    1 +
>>  1 files changed, 1 insertions(+), 0 deletions(-)
>>
>> diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c
>> index da950c4..7222fd7 100644
>> --- a/drivers/mmc/core/host.c
>> +++ b/drivers/mmc/core/host.c
>> @@ -339,6 +339,7 @@ struct mmc_host *mmc_alloc_host(int extra, struct device *dev)
>>         host->class_dev.parent = dev;
>>         host->class_dev.class = &mmc_host_class;
>>         device_initialize(&host->class_dev);
>> +       device_enable_async_suspend(&host->class_dev);
>>
>>         if (mmc_gpio_alloc(host)) {
>>                 put_device(&host->class_dev);
>> -- 1.7.1
>>
> Otherwise I think this looks good!
>
> Kind regards
> Uffe

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