From: Ohad Ben-Cohen <ohad@wizery.com>
To: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: Alan Stern <stern@rowland.harvard.edu>,
linux-pm@lists.linux-foundation.org,
Johannes Berg <johannes@sipsolutions.net>,
linux-wireless@vger.kernel.org, linux-mmc@vger.kernel.org,
Ido Yariv <ido@wizery.com>,
Kevin Hilman <khilman@deeprootsystems.com>
Subject: Re: [linux-pm] subtle pm_runtime_put_sync race and sdio functions
Date: Tue, 28 Dec 2010 21:34:09 +0200 [thread overview]
Message-ID: <AANLkTinPrUbaFsNMmoZJtOaF6dutLaXXQ7Uws5826n4=@mail.gmail.com> (raw)
In-Reply-To: <201012282021.31695.rjw@sisk.pl>
On Tue, Dec 28, 2010 at 9:21 PM, Rafael J. Wysocki <rjw@sisk.pl> wrote:
> It looks like you could simply do a power down-power up cycle before trying to
> load new firmware, just in case. I guess that's suboptimal for some reason?
It would work, but we will not be able to unconditionally disable the
radios (e.g. airplane mode comes to mind).
> Please pretend that the runtime PM framework doesn't exist for a while. How
> would you design things in that case?
Duplicate most of runtime-PM's plumbing into the MMC/SDIO subsystem.
Off the top of my hat:
- We need the device hierarchy and the suspend/resume dependencies (a
single SDIO card has several logical sub-devices, a.k.a SDIO
functions)
- We need to maintain usage_count for each device, and expose the same
API to handle it
- We need autosuspend for MMC cards (power them off on inactivity)
- We need the same, or similar, locking plumbing
- We probably need the same sysfs ABI as well: autosuspend_delay_ms,
and even /sys/devices/.../power/control itself is useful (not for our
device, but for others, sure)
- ...
Thanks,
Ohad.
next prev parent reply other threads:[~2010-12-28 19:34 UTC|newest]
Thread overview: 179+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-12-09 23:37 subtle pm_runtime_put_sync race and sdio functions Ohad Ben-Cohen
2010-12-10 0:00 ` Rafael J. Wysocki
2010-12-10 0:00 ` [linux-pm] " Rafael J. Wysocki
2010-12-10 17:24 ` Alan Stern
2010-12-10 17:24 ` [linux-pm] " Alan Stern
2010-12-10 22:01 ` Rafael J. Wysocki
2010-12-10 22:01 ` [linux-pm] " Rafael J. Wysocki
2010-12-10 23:02 ` Ohad Ben-Cohen
2010-12-10 23:02 ` [linux-pm] " Ohad Ben-Cohen
2010-12-10 22:59 ` Ohad Ben-Cohen
2010-12-10 22:59 ` [linux-pm] " Ohad Ben-Cohen
2010-12-11 1:17 ` Ohad Ben-Cohen
2010-12-11 14:53 ` Alan Stern
2010-12-11 1:17 ` Ohad Ben-Cohen
2010-12-11 14:50 ` Alan Stern
2010-12-18 13:29 ` Ohad Ben-Cohen
2010-12-18 13:29 ` [linux-pm] " Ohad Ben-Cohen
2010-12-18 14:16 ` David Vrabel
2010-12-18 15:12 ` Ohad Ben-Cohen
2010-12-18 15:12 ` Ohad Ben-Cohen
2010-12-18 14:16 ` David Vrabel
2010-12-18 15:07 ` [linux-pm] " Rafael J. Wysocki
2010-12-18 16:00 ` Ohad Ben-Cohen
2010-12-18 16:00 ` [linux-pm] " Ohad Ben-Cohen
2010-12-18 16:40 ` Johannes Berg
2010-12-18 19:08 ` Ohad Ben-Cohen
2010-12-18 19:08 ` Ohad Ben-Cohen
2010-12-18 21:30 ` Alan Stern
2010-12-18 21:30 ` Alan Stern
2010-12-18 22:57 ` Rafael J. Wysocki
2010-12-18 22:57 ` [linux-pm] " Rafael J. Wysocki
2010-12-18 21:30 ` Alan Stern
2010-12-18 22:52 ` Rafael J. Wysocki
2010-12-18 22:52 ` [linux-pm] " Rafael J. Wysocki
2010-12-18 19:08 ` Ohad Ben-Cohen
2010-12-18 21:29 ` [linux-pm] " Alan Stern
2010-12-18 21:29 ` Alan Stern
2010-12-18 21:29 ` Alan Stern
2010-12-18 22:50 ` Rafael J. Wysocki
2010-12-18 22:50 ` [linux-pm] " Rafael J. Wysocki
2010-12-18 16:40 ` Johannes Berg
2010-12-18 22:47 ` [linux-pm] " Rafael J. Wysocki
2010-12-18 22:47 ` Rafael J. Wysocki
2010-12-19 7:48 ` Ohad Ben-Cohen
2010-12-19 7:48 ` Ohad Ben-Cohen
2010-12-19 7:48 ` Ohad Ben-Cohen
2010-12-19 10:22 ` Rafael J. Wysocki
2010-12-19 10:22 ` [linux-pm] " Rafael J. Wysocki
2010-12-20 3:37 ` Alan Stern
2010-12-20 3:37 ` Alan Stern
2010-12-20 21:17 ` Rafael J. Wysocki
2010-12-21 0:57 ` Alan Stern
2010-12-21 0:57 ` Alan Stern
2010-12-21 21:31 ` Rafael J. Wysocki
2010-12-22 1:42 ` Alan Stern
2010-12-22 1:42 ` Alan Stern
2010-12-22 12:29 ` Rafael J. Wysocki
2010-12-22 12:29 ` Rafael J. Wysocki
2011-01-26 23:28 ` Kevin Hilman
2011-01-26 23:28 ` Kevin Hilman
2011-01-27 18:13 ` Alan Stern
2011-01-27 18:13 ` [linux-pm] " Alan Stern
2011-01-27 18:13 ` Alan Stern
2011-01-27 19:22 ` Kevin Hilman
2011-01-27 19:22 ` [linux-pm] " Kevin Hilman
2011-01-27 19:22 ` Kevin Hilman
2011-01-27 19:49 ` Alan Stern
2011-01-27 19:49 ` [linux-pm] " Alan Stern
2011-01-27 19:49 ` Alan Stern
2011-01-27 20:15 ` Kevin Hilman
2011-01-27 20:15 ` [linux-pm] " Kevin Hilman
2011-01-27 20:15 ` Kevin Hilman
2011-01-27 22:18 ` Vitaly Wool
2011-01-27 22:18 ` Vitaly Wool
2011-01-27 22:18 ` Vitaly Wool
2011-01-27 23:21 ` Rafael J. Wysocki
2011-01-27 23:21 ` [linux-pm] " Rafael J. Wysocki
2011-01-27 23:49 ` Kevin Hilman
2011-01-27 23:49 ` [linux-pm] " Kevin Hilman
2011-01-27 23:11 ` Rafael J. Wysocki
2011-01-27 23:11 ` [linux-pm] " Rafael J. Wysocki
2011-01-27 18:20 ` Vitaly Wool
2011-01-27 18:20 ` [linux-pm] " Vitaly Wool
2011-01-27 18:20 ` Vitaly Wool
2011-01-27 18:54 ` Kevin Hilman
2011-01-27 18:54 ` [linux-pm] " Kevin Hilman
2010-12-22 12:29 ` Rafael J. Wysocki
2010-12-22 1:42 ` Alan Stern
2010-12-21 21:31 ` Rafael J. Wysocki
2010-12-21 0:57 ` Alan Stern
2010-12-20 21:17 ` Rafael J. Wysocki
2010-12-20 3:37 ` Alan Stern
2010-12-21 22:23 ` Kevin Hilman
2010-12-21 22:23 ` [linux-pm] " Kevin Hilman
2010-12-22 1:48 ` Alan Stern
2010-12-22 1:48 ` Alan Stern
2010-12-22 1:48 ` Alan Stern
2010-12-23 7:51 ` Ohad Ben-Cohen
2010-12-23 7:51 ` [linux-pm] " Ohad Ben-Cohen
2010-12-23 16:03 ` Alan Stern
2010-12-23 16:03 ` [linux-pm] " Alan Stern
2010-12-23 16:03 ` Alan Stern
2010-12-25 7:34 ` Ohad Ben-Cohen
2010-12-25 7:34 ` Ohad Ben-Cohen
2010-12-25 16:21 ` Alan Stern
2010-12-25 16:21 ` Alan Stern
2010-12-25 20:58 ` Ohad Ben-Cohen
2010-12-25 20:58 ` [linux-pm] " Ohad Ben-Cohen
2010-12-25 20:58 ` Ohad Ben-Cohen
2010-12-25 21:50 ` Vitaly Wool
2010-12-25 21:50 ` [linux-pm] " Vitaly Wool
2010-12-26 5:27 ` Ohad Ben-Cohen
2010-12-26 5:27 ` [linux-pm] " Ohad Ben-Cohen
2010-12-25 21:54 ` Vitaly Wool
2010-12-25 21:54 ` Vitaly Wool
2010-12-25 21:54 ` Vitaly Wool
2010-12-26 2:48 ` [linux-pm] " Alan Stern
2010-12-26 2:48 ` Alan Stern
2010-12-26 5:55 ` Ohad Ben-Cohen
2010-12-26 5:55 ` [linux-pm] " Ohad Ben-Cohen
2010-12-26 5:55 ` Ohad Ben-Cohen
2010-12-26 11:45 ` Rafael J. Wysocki
2010-12-26 12:43 ` Ohad Ben-Cohen
2010-12-26 12:43 ` [linux-pm] " Ohad Ben-Cohen
2010-12-26 12:43 ` Ohad Ben-Cohen
2010-12-26 18:35 ` Rafael J. Wysocki
2010-12-28 19:11 ` Ohad Ben-Cohen
2010-12-28 19:11 ` [linux-pm] " Ohad Ben-Cohen
2010-12-28 19:21 ` Rafael J. Wysocki
2010-12-28 19:21 ` [linux-pm] " Rafael J. Wysocki
2010-12-28 19:21 ` Rafael J. Wysocki
2010-12-28 19:34 ` Ohad Ben-Cohen [this message]
2010-12-28 20:36 ` Rafael J. Wysocki
2010-12-28 20:36 ` [linux-pm] " Rafael J. Wysocki
2010-12-28 19:34 ` Ohad Ben-Cohen
2010-12-26 18:35 ` Rafael J. Wysocki
2010-12-26 14:53 ` [linux-pm] " Ohad Ben-Cohen
2010-12-26 18:37 ` Rafael J. Wysocki
2010-12-26 18:37 ` [linux-pm] " Rafael J. Wysocki
2010-12-28 19:15 ` Ohad Ben-Cohen
2010-12-28 20:04 ` Rafael J. Wysocki
2010-12-28 20:04 ` [linux-pm] " Rafael J. Wysocki
2010-12-28 20:04 ` Rafael J. Wysocki
2010-12-28 20:41 ` Ohad Ben-Cohen
2010-12-28 20:41 ` [linux-pm] " Ohad Ben-Cohen
2010-12-28 20:41 ` Ohad Ben-Cohen
2010-12-28 19:15 ` Ohad Ben-Cohen
2010-12-26 14:53 ` Ohad Ben-Cohen
2010-12-26 11:45 ` Rafael J. Wysocki
2010-12-26 17:00 ` [linux-pm] " Alan Stern
2010-12-26 17:00 ` Alan Stern
2010-12-28 19:04 ` Ohad Ben-Cohen
2010-12-28 19:04 ` [linux-pm] " Ohad Ben-Cohen
2010-12-28 19:04 ` Ohad Ben-Cohen
2010-12-28 21:46 ` Alan Stern
2010-12-28 21:46 ` [linux-pm] " Alan Stern
2010-12-28 21:46 ` Alan Stern
2010-12-29 6:34 ` Ohad Ben-Cohen
2010-12-30 4:25 ` Alan Stern
2010-12-30 4:25 ` Alan Stern
2010-12-30 4:25 ` Alan Stern
2010-12-29 6:34 ` Ohad Ben-Cohen
2010-12-29 8:01 ` Ohad Ben-Cohen
2010-12-29 8:01 ` [linux-pm] " Ohad Ben-Cohen
2010-12-30 4:30 ` Alan Stern
2010-12-30 4:30 ` [linux-pm] " Alan Stern
2010-12-30 4:30 ` Alan Stern
2010-12-26 17:00 ` Alan Stern
2010-12-26 2:48 ` Alan Stern
2010-12-25 16:21 ` Alan Stern
2010-12-25 7:34 ` Ohad Ben-Cohen
2010-12-18 22:47 ` Rafael J. Wysocki
2010-12-18 15:07 ` Rafael J. Wysocki
2010-12-18 21:20 ` [linux-pm] " Alan Stern
2010-12-18 23:03 ` Rafael J. Wysocki
2010-12-18 23:03 ` Rafael J. Wysocki
2010-12-19 10:00 ` [linux-pm] " Ohad Ben-Cohen
2010-12-19 10:00 ` Ohad Ben-Cohen
2010-12-18 21:20 ` Alan Stern
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