All of lore.kernel.org
 help / color / mirror / Atom feed
From: "Kiwoong Kim" <kwmad.kim@samsung.com>
To: <linux-mmc@vger.kernel.org>, <ulf.hansson@linaro.org>
Subject: About SD initialization at resume time
Date: Wed, 3 Mar 2021 18:22:21 +0900	[thread overview]
Message-ID: <000001d7100e$b7380f50$25a82df0$@samsung.com> (raw)
In-Reply-To: CGME20210303092222epcas2p11fbb2697a53b54dbc138d741893c9f07@epcas2p1.samsung.com

Dear all

I hope opinions from you guys.

For many users of mobile device, there is a possibility that issuing no IO request to
a SD card is rare during much of the device's lifetime.
Obviously the symptom would happen frequently among system suspend times, too.
In this situation, doing SD initialization at every system resume leads to long latency
and can make the users feel it, even when there is no IO request during the period,
when a hardware architecture requires re-initialization at resume time.
This is what had actually happened and was fixed with some code in commercial products.

Is there any way to avoid that symptom w/o any code change?
With no way, I hope to make soemthing to improve it.

Thanks.
Kiwoong Kim



       reply	other threads:[~2021-03-04  0:02 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CGME20210303092222epcas2p11fbb2697a53b54dbc138d741893c9f07@epcas2p1.samsung.com>
2021-03-03  9:22 ` Kiwoong Kim [this message]
2021-03-03 11:42   ` About SD initialization at resume time Ulf Hansson
2021-03-04  7:43     ` Kiwoong Kim
2021-03-08 11:32       ` Ulf Hansson

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to='000001d7100e$b7380f50$25a82df0$@samsung.com' \
    --to=kwmad.kim@samsung.com \
    --cc=linux-mmc@vger.kernel.org \
    --cc=ulf.hansson@linaro.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.