From: Ulf Hansson <ulf.hansson@stericsson.com>
To: Vitaly Wool <vitalywool@gmail.com>
Cc: "linux-mmc@vger.kernel.org" <linux-mmc@vger.kernel.org>,
Chris Ball <cjb@laptop.org>,
Per FORLIN <per.forlin@stericsson.com>,
Johan RUDHOLM <johan.rudholm@stericsson.com>,
Lee Jones <lee.jones@linaro.org>
Subject: Re: [PATCH V2 2/2] mmc: Minimize resume-time by deferring resume
Date: Wed, 14 Dec 2011 16:29:04 +0100 [thread overview]
Message-ID: <4EE8C0C0.6010307@stericsson.com> (raw)
In-Reply-To: <CAMJBoFNU_+Ah8oxXy2Smr5L5oZ4wjZ1m8v6sp-kVcxgk4kYmNg@mail.gmail.com>
Vitaly Wool wrote:
> Hi Ulf,
>
> On Wed, Dec 14, 2011 at 4:06 PM, Ulf Hansson <ulf.hansson@stericsson.com<mailto:ulf.hansson@stericsson.com>> wrote:
> Typically an sd/mmc card takes around 200 - 1100 ms to
> initialize when the power to the card has been cut, which
> is what happens during a suspend/resume sequence.
>
> I'm a bit pessimistic about this patch. What if we have a root filesystem on an SD card, or, what is a more common case, on an eMMC? How is it going to be handled?
>
This is handled for sure. I have verified this case and I agree that
this is likely a common case.
In principle, every mmc/sd requests handled in issue_rq (block.c), will
unless the host is not already resumed, do a "sync" of the resume work.
> I see no trace of taking this into account in here so it's a NAK for now from my side.
>
> Thanks,
> Vitaly
>
Br
Ulf Hansson
next prev parent reply other threads:[~2011-12-14 15:29 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-14 15:06 [PATCH V2 0/2] mmc: Minimize resume time for sd/mmc Ulf Hansson
2011-12-14 15:06 ` [PATCH V2 1/2] mmc: block: Remove use of mmc_blk_set_blksize Ulf Hansson
2011-12-14 15:06 ` [PATCH V2 2/2] mmc: Minimize resume-time by deferring resume Ulf Hansson
[not found] ` <CAMJBoFNU_+Ah8oxXy2Smr5L5oZ4wjZ1m8v6sp-kVcxgk4kYmNg@mail.gmail.com>
2011-12-14 15:29 ` Ulf Hansson [this message]
[not found] ` <CAMJBoFM9v9ugDL8gtNJ+AMCKmvOsUQHEmEf13VDXko41AkFfFA@mail.gmail.com>
[not found] ` <CAMJBoFPcBzezFDRXpL36zJZTttGgUFzDCUaFC69Pxg+gEWcAOw@mail.gmail.com>
2011-12-14 16:43 ` Ulf Hansson
[not found] ` <CAMJBoFPSEtM1rQ7Rq8d+Y6Qgd_GKq2o4p=vk60wZdbJ_Mhk_Gw@mail.gmail.com>
2011-12-15 9:22 ` Ulf Hansson
[not found] ` <CAMJBoFN5tub+Lv5p2Ae3UQY48G2TMBBmdkdsA1TNDqf2stDGVg@mail.gmail.com>
2011-12-19 11:03 ` Ulf Hansson
[not found] ` <4EEF0541.6070306@stericsson.com>
2011-12-19 12:21 ` Ulf Hansson
2012-01-03 15:24 ` [PATCH V2 0/2] mmc: Minimize resume time for sd/mmc Ulf Hansson
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