linux-kernel - Re: [PATCH 1/2 v2] mmc: enable mmc host device to suspend/resume asynchronously

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Message-ID: <CAPDyKFqRGAVuWSbWFEGiDoj8ZUDgpbKty=pNDxiatn4MRKhMYw@mail.gmail.com>
Date:	Fri, 29 Jan 2016 12:40:22 +0100
From:	Ulf Hansson <ulf.hansson@...aro.org>
To:	"Fu, Zhonghui" <zhonghui.fu@...ux.intel.com>,
	Adrian Hunter <adrian.hunter@...el.com>
Cc:	Venu Byravarasu <vbyravarasu@...dia.com>,
	Chaotian Jing <chaotian.jing@...iatek.com>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Sudeep Holla <Sudeep.Holla@....com>,
	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	linux-mmc <linux-mmc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2 v2] mmc: enable mmc host device to suspend/resume asynchronously

On 26 January 2016 at 03:15, Fu, Zhonghui <zhonghui.fu@...ux.intel.com> wrote:
>
>
> On 1/22/2016 10:51 PM, Ulf Hansson wrote:
>> On 22 January 2016 at 04:32, Fu, Zhonghui <zhonghui.fu@...ux.intel.com> wrote:
>>> This patch enables mmc hosts to suspend/resume asynchronously.
>>> This will 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.
>> Do you really reduce time at all with this patch by its own? I think not.
>>
>> Moreover, I thought the biggest improvement came from the patch which
>> enabled async suspend/resume for the MMC/SD/SDIO device?
>> ec076cd226c3 ("mmc: enable MMC/SD/SDIO device to suspend/resume asynchronously")
>>
>> Similar comment applies to patch2/2, but I would expect it together
>> with the $subject patch gives an improvement.
>>
>> Please update the change-logs one more round.
>
> The reduce time is not contributed by only this patch, please see the change-log: "After applying this patch and enabling all mmc hosts' child devices to suspend/resume asynchronously on ASUS T100TA .......". Actually, the biggest improvement came from the patch - "net/wireless: enable wiphy device to suspend/resume asynchronously(commit 9f0e13546ef5773b7059b531a667ec47a5f897ee)". Wiphy device(phy0) is child device of WiFi card(SDIO card).
>
> Do you mean that I should list the reduce time contributed by only this patch and patch2/2 in change-log?


Okay, fair enough. I should have read the change log a bit more detailed.

Let's keep this as is! I have applied both patch 1 and patch2.

Adrian, please tell me if you don't like patch2 (sdhci-acpi), then I
will drop it.

Thanks and kind regards
Uffe