From: Antti Palosaari <crope@iki.fi>
To: Mauro Carvalho Chehab <mchehab@redhat.com>
Cc: Linux Media Mailing List <linux-media@vger.kernel.org>
Subject: Re: [PATCH 3/3] [media] az6007: handle CI during suspend/resume
Date: Mon, 06 Aug 2012 15:21:48 +0300 [thread overview]
Message-ID: <501FB6DC.3040200@iki.fi> (raw)
In-Reply-To: <1344188679-8247-4-git-send-email-mchehab@redhat.com>
On 08/05/2012 08:44 PM, Mauro Carvalho Chehab wrote:
> The dvb-usb-v2 core doesn't know anything about CI. So, the
> driver needs to handle it by hand. This patch stops CI just
> before stopping URB's/RC, and restarts it before URB/RC start.
>
> It should be noticed that suspend/resume is not yet working properly,
> as the PM model requires the implementation of reset_resume:
> dvb_usb_az6007 1-6:1.0: no reset_resume for driver dvb_usb_az6007?
> But this is not implemented there at dvb-usb-v2 yet.
That is true, but it is coming:
http://blog.palosaari.fi/2012/07/dvb-power-management-on-suspend.html
http://git.linuxtv.org/anttip/media_tree.git/shortlog/refs/heads/dvb_core3
At the time I added initial suspend/resume support for dvb-usb-v2 I left
those out purposely as I saw some study and changes are needed for
DVB-core/frontend.
Normally suspend keeps USB-device powered and calls .resume() on resume.
But on certain conditions USB device could lose power during suspend and
on that case reset_resume() is called, and if there is no reset_resume()
is calls disconnect() (and probe() after that).
regards
Antti
--
http://palosaari.fi/
next prev parent reply other threads:[~2012-08-06 12:22 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-05 17:44 [PATCH 0/3] Some additional az6007 cleanup patches Mauro Carvalho Chehab
2012-08-05 17:44 ` [PATCH 1/3] [media] az6007: rename "st" to "state" at az6007_power_ctrl() Mauro Carvalho Chehab
2012-08-05 17:44 ` [PATCH 2/3] [media] az6007: make all functions static Mauro Carvalho Chehab
2012-08-05 17:44 ` [PATCH 3/3] [media] az6007: handle CI during suspend/resume Mauro Carvalho Chehab
2012-08-06 12:21 ` Antti Palosaari [this message]
2012-08-07 11:41 ` Mauro Carvalho Chehab
2012-08-07 12:12 ` Antti Palosaari
2012-08-07 12:40 ` Mauro Carvalho Chehab
2012-08-06 15:28 ` [PATCH 0/3] Some additional az6007 cleanup patches Roger Mårtensson
2012-08-06 16:17 ` Mauro Carvalho Chehab
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