From: NeilBrown <neilb@suse.de>
To: Kevin Hilman <khilman@ti.com>
Cc: Joe Woodward <jw@terrafix.co.uk>,
Tomi Valkeinen <tomi.valkeinen@ti.com>,
Paul Walmsley <paul@pwsan.com>,
t-kristo@ti.com, govindraj.r@ti.com, linux-omap@vger.kernel.org
Subject: Re: DSS2/PM on 3.2 broken?
Date: Wed, 25 Jan 2012 11:32:08 +1100 [thread overview]
Message-ID: <20120125113208.40cdb62f@notabene.brown> (raw)
In-Reply-To: <87k44ikr23.fsf@ti.com>
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On Mon, 23 Jan 2012 14:11:16 -0800 Kevin Hilman <khilman@ti.com> wrote:
> NeilBrown <neilb@suse.de> writes:
>
> > On Thu, 19 Jan 2012 16:22:37 -0800 Kevin Hilman <khilman@ti.com> wrote:
> >
> >> NeilBrown <neilb@suse.de> writes:
> >>
> >> > On Thu, 19 Jan 2012 11:37:39 -0800 Kevin Hilman <khilman@ti.com> wrote:
> >> >
> >> >> "Joe Woodward" <jw@terrafix.co.uk> writes:
>
> >> >>
>
> [...]
>
> >> At least this part is expected.
> >>
> >> In the kernel you're using the UART clocks are enabled/disabled during
> >> the idle path depending on the low-power state being targetted, so would
> >> expect to see lots of UART clock gating going on.
> >
> > Even though uarts 1,2,4 aren't even in use?
>
> Yes. Our UART idle management before v3.3 was, um... a disaster.
>
> > Maybe this is fixed in 3.3?
>
> As of v3.3, the UARTs are managed independently using runtime PM
> autosupend, so only UART that are in use should be coming on and back
> off again.
>
> However, as Paul has recently posted some UART fixes, you'll see that we
> have a few kinks to work out in the UART driver as well.
Good news ... I'll probably hold out until -rc2 before I start experimenting
with 3.3 much.
I think I understand why I was getting single-character corruption when
waking the UART while you just lost the character - I suspect you had
off_mode enabled. That makes the difference for me.
Hopefully we can get rid of both the corruption and the character loss, but
I'll wait until I've tried 3.3 before I pursue that much more.
Thanks,
NeilBrown
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next prev parent reply other threads:[~2012-01-25 0:32 UTC|newest]
Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-09 12:46 DSS2/PM on 3.2 broken? Joe Woodward
2012-01-09 21:08 ` NeilBrown
2012-01-10 9:58 ` Joe Woodward
2012-01-11 13:43 ` Paul Walmsley
2012-01-11 14:22 ` Archit
2012-01-11 15:15 ` Joe Woodward
2012-01-11 15:52 ` Archit
2012-01-11 16:13 ` Joe Woodward
2012-01-11 16:54 ` Archit
2012-01-12 9:28 ` Tomi Valkeinen
2012-01-12 9:30 ` Tomi Valkeinen
2012-01-12 9:51 ` Tomi Valkeinen
2012-01-11 22:59 ` NeilBrown
2012-01-13 10:05 ` Paul Walmsley
2012-01-13 11:20 ` NeilBrown
2012-01-13 11:31 ` Paul Walmsley
2012-01-13 23:09 ` NeilBrown
2012-01-13 23:35 ` Paul Walmsley
2012-01-17 21:24 ` NeilBrown
2012-01-22 0:07 ` Paul Walmsley
2012-01-22 11:30 ` NeilBrown
2012-01-24 10:37 ` OMAP HDQ: was " NeilBrown
2012-01-26 14:19 ` Paul Walmsley
2012-01-27 22:35 ` NeilBrown
2012-01-27 22:58 ` Paul Walmsley
2012-01-28 0:40 ` NeilBrown
2012-01-28 6:02 ` Paul Walmsley
2012-02-01 7:51 ` NeilBrown
2012-02-01 18:36 ` Paul Walmsley
2012-01-18 7:13 ` Tomi Valkeinen
2012-01-18 11:15 ` NeilBrown
2012-01-18 11:42 ` Tomi Valkeinen
2012-01-18 20:30 ` NeilBrown
2012-01-19 10:17 ` Joe Woodward
2012-01-19 10:40 ` Tomi Valkeinen
2012-01-19 11:29 ` Joe Woodward
2012-01-19 11:36 ` Tomi Valkeinen
2012-01-19 12:21 ` Joe Woodward
2012-01-19 14:52 ` Tomi Valkeinen
2012-01-19 19:37 ` Kevin Hilman
2012-01-19 21:05 ` NeilBrown
2012-01-20 0:22 ` Kevin Hilman
2012-01-21 12:12 ` NeilBrown
2012-01-23 22:11 ` Kevin Hilman
2012-01-25 0:32 ` NeilBrown [this message]
2012-01-13 11:34 ` Govindraj
2012-01-13 13:23 ` Paul Walmsley
2012-01-13 19:21 ` Kevin Hilman
2012-01-13 22:37 ` Kevin Hilman
2012-01-13 23:06 ` Paul Walmsley
2012-01-13 23:34 ` Paul Walmsley
2012-01-14 1:17 ` NeilBrown
2012-01-14 1:28 ` Paul Walmsley
2012-01-13 23:39 ` Paul Walmsley
2012-01-13 11:19 ` Paul Walmsley
2012-01-11 13:32 ` Paul Walmsley
2012-01-12 16:42 ` Tomi Valkeinen
2012-01-12 22:40 ` Kevin Hilman
2012-01-13 5:29 ` Tomi Valkeinen
2012-01-13 19:30 ` Kevin Hilman
2012-01-16 11:11 ` Tomi Valkeinen
2012-01-19 19:24 ` Kevin Hilman
2012-01-20 7:16 ` Tomi Valkeinen
2012-01-20 18:06 ` Kevin Hilman
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