From: Felipe Balbi <balbi@ti.com>
To: Paul Walmsley <paul@pwsan.com>
Cc: Felipe Balbi <balbi@ti.com>,
Jean Pihet <jean.pihet@newoldbits.com>,
aaro.koskinen@iki.fi, linux-omap@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, khilman@ti.com
Subject: Re: OMAP baseline test results for v3.7-rc1
Date: Tue, 30 Oct 2012 14:54:19 +0200 [thread overview]
Message-ID: <20121030125419.GG29095@arwen.pp.htv.fi> (raw)
In-Reply-To: <alpine.DEB.2.00.1210301239310.12697@utopia.booyaka.com>
[-- Attachment #1: Type: text/plain, Size: 2039 bytes --]
Hi,
On Tue, Oct 30, 2012 at 12:50:52PM +0000, Paul Walmsley wrote:
> On Tue, 30 Oct 2012, Felipe Balbi wrote:
>
> > the wmb() patch should help, but you said it doesn't, right ?
>
> Correct. Not sure why you think that would help; the problem is almost
because of how the driver is behaving...
The only way for omap_i2c_wait_for_bb() to timeout is if the bus is
really still busy; meaning that either transfer hasn't fully completed
(some data still in FIFO), or we didn't send STOP or Repeated START
condition on the bus.
> certainly PM-idle related, given that the problem goes away by reverting
> Jean's commit 3db11feffc1ad2ab9dea27789e6b5b3032827adc "ARM: OMAP: convert
> I2C driver to PM QoS for MPU latency constraints".
>
> The problem is consistent and easy to reproduce here.
I don't doubt that :-) What I think, however, is that PM QoS just made
the problem a bit easier to trigger for whatever reason. Maybe because
pm qos defers constraint updates, or something similar ?
> > without seeing debugging information on the failing case, it'll be very
> > difficult to sort this one out provided noone else seems to be able to
> > reproduce it.
>
> Aaro sees it also, so it's definitely not a local artifact.
Again I don't doubt it.
> It's not very surprising that the problem doesn't appear with the extra
> logging enabled, since the extra logging presumably keeps the system out
> of idle.
>
> Anyway, you are welcome to the userspace, bootloader, and X-loader here if
> you would like to try to reproduce it. They've been sent to Jean and
> Kevin and Shubhrajyoti already. Simply request it and I will send links.
I can have a look, sure, but I don't have the same platform as you have.
I have a beagle XM revB (according to the stickers on the board) which I
could use to try to reproduce, if I manage to, then hooray :-)
In that case, please give me also a link to your uImage so I can make
sure to use the exact same setup.
cheers
--
balbi
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WARNING: multiple messages have this Message-ID (diff)
From: balbi@ti.com (Felipe Balbi)
To: linux-arm-kernel@lists.infradead.org
Subject: OMAP baseline test results for v3.7-rc1
Date: Tue, 30 Oct 2012 14:54:19 +0200 [thread overview]
Message-ID: <20121030125419.GG29095@arwen.pp.htv.fi> (raw)
In-Reply-To: <alpine.DEB.2.00.1210301239310.12697@utopia.booyaka.com>
Hi,
On Tue, Oct 30, 2012 at 12:50:52PM +0000, Paul Walmsley wrote:
> On Tue, 30 Oct 2012, Felipe Balbi wrote:
>
> > the wmb() patch should help, but you said it doesn't, right ?
>
> Correct. Not sure why you think that would help; the problem is almost
because of how the driver is behaving...
The only way for omap_i2c_wait_for_bb() to timeout is if the bus is
really still busy; meaning that either transfer hasn't fully completed
(some data still in FIFO), or we didn't send STOP or Repeated START
condition on the bus.
> certainly PM-idle related, given that the problem goes away by reverting
> Jean's commit 3db11feffc1ad2ab9dea27789e6b5b3032827adc "ARM: OMAP: convert
> I2C driver to PM QoS for MPU latency constraints".
>
> The problem is consistent and easy to reproduce here.
I don't doubt that :-) What I think, however, is that PM QoS just made
the problem a bit easier to trigger for whatever reason. Maybe because
pm qos defers constraint updates, or something similar ?
> > without seeing debugging information on the failing case, it'll be very
> > difficult to sort this one out provided noone else seems to be able to
> > reproduce it.
>
> Aaro sees it also, so it's definitely not a local artifact.
Again I don't doubt it.
> It's not very surprising that the problem doesn't appear with the extra
> logging enabled, since the extra logging presumably keeps the system out
> of idle.
>
> Anyway, you are welcome to the userspace, bootloader, and X-loader here if
> you would like to try to reproduce it. They've been sent to Jean and
> Kevin and Shubhrajyoti already. Simply request it and I will send links.
I can have a look, sure, but I don't have the same platform as you have.
I have a beagle XM revB (according to the stickers on the board) which I
could use to try to reproduce, if I manage to, then hooray :-)
In that case, please give me also a link to your uImage so I can make
sure to use the exact same setup.
cheers
--
balbi
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next prev parent reply other threads:[~2012-10-30 13:00 UTC|newest]
Thread overview: 138+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-18 5:20 OMAP baseline test results for v3.7-rc1 Paul Walmsley
2012-10-18 5:20 ` Paul Walmsley
2012-10-18 6:48 ` Paul Walmsley
2012-10-18 6:48 ` Paul Walmsley
2012-10-18 8:37 ` Tero Kristo
2012-10-18 8:37 ` Tero Kristo
2012-10-18 8:48 ` Santosh Shilimkar
2012-10-18 8:48 ` Santosh Shilimkar
2012-10-20 17:30 ` Paul Walmsley
2012-10-20 17:30 ` Paul Walmsley
2012-10-19 16:55 ` Paul Walmsley
2012-10-19 16:55 ` Paul Walmsley
2012-10-19 17:01 ` Felipe Balbi
2012-10-19 17:01 ` Felipe Balbi
2012-10-19 17:56 ` Paul Walmsley
2012-10-19 17:56 ` Paul Walmsley
2012-10-19 18:10 ` Felipe Balbi
2012-10-19 18:10 ` Felipe Balbi
2012-10-19 19:03 ` Aaro Koskinen
2012-10-19 19:03 ` Aaro Koskinen
2012-10-19 19:01 ` Felipe Balbi
2012-10-19 19:01 ` Felipe Balbi
2012-10-19 19:38 ` Aaro Koskinen
2012-10-19 19:38 ` Aaro Koskinen
2012-10-22 17:21 ` Kevin Hilman
2012-10-22 17:21 ` Kevin Hilman
2012-10-22 20:43 ` Kevin Hilman
2012-10-22 20:43 ` Kevin Hilman
2012-10-20 6:14 ` Paul Walmsley
2012-10-20 6:14 ` Paul Walmsley
2012-10-22 16:12 ` Jean Pihet
2012-10-22 16:12 ` Jean Pihet
2012-10-22 17:26 ` Jean Pihet
2012-10-22 17:26 ` Jean Pihet
2012-10-23 19:19 ` Paul Walmsley
2012-10-23 19:19 ` Paul Walmsley
2012-10-23 19:23 ` Jean Pihet
2012-10-23 19:23 ` Jean Pihet
2012-10-25 10:12 ` Felipe Balbi
2012-10-25 10:12 ` Felipe Balbi
2012-10-26 20:15 ` Felipe Balbi
2012-10-26 20:15 ` Felipe Balbi
2012-10-26 22:03 ` Paul Walmsley
2012-10-26 22:03 ` Paul Walmsley
2012-10-29 20:00 ` Felipe Balbi
2012-10-29 20:00 ` Felipe Balbi
2012-10-30 12:17 ` Paul Walmsley
2012-10-30 12:17 ` Paul Walmsley
2012-10-30 12:32 ` Felipe Balbi
2012-10-30 12:32 ` Felipe Balbi
2012-10-30 12:50 ` Paul Walmsley
2012-10-30 12:50 ` Paul Walmsley
2012-10-30 12:54 ` Felipe Balbi [this message]
2012-10-30 12:54 ` Felipe Balbi
2012-10-30 13:17 ` Paul Walmsley
2012-10-30 13:17 ` Paul Walmsley
2012-10-30 14:04 ` Paul Walmsley
2012-10-30 14:04 ` Paul Walmsley
2012-10-31 8:34 ` Jean Pihet
2012-10-31 8:34 ` Jean Pihet
2012-10-31 9:05 ` Rafael J. Wysocki
2012-10-31 9:05 ` Rafael J. Wysocki
2012-10-31 8:22 ` Jean Pihet
2012-10-31 8:22 ` Jean Pihet
2012-10-31 10:49 ` Kevin Hilman
2012-10-31 10:49 ` Kevin Hilman
2012-10-31 21:11 ` Jean Pihet
2012-10-31 21:11 ` Jean Pihet
2012-11-01 2:44 ` Paul Walmsley
2012-11-01 2:44 ` Paul Walmsley
2012-11-01 7:51 ` Jean Pihet
2012-11-01 7:51 ` Jean Pihet
2012-11-03 21:39 ` Jean Pihet
2012-11-03 21:39 ` Jean Pihet
2012-11-05 3:15 ` Paul Walmsley
2012-11-05 3:15 ` Paul Walmsley
2012-11-05 9:26 ` Jean Pihet
2012-11-05 9:26 ` Jean Pihet
2012-11-06 0:01 ` Kevin Hilman
2012-11-06 0:01 ` Kevin Hilman
2012-11-06 9:27 ` Jean Pihet
2012-11-06 9:27 ` Jean Pihet
2012-11-06 16:13 ` Paul Walmsley
2012-11-06 16:13 ` Paul Walmsley
2012-11-06 10:06 ` Shubhrajyoti Datta
2012-11-06 10:06 ` Shubhrajyoti Datta
2012-10-30 4:16 ` Paul Walmsley
2012-10-30 4:16 ` Paul Walmsley
2012-10-30 8:54 ` Jean Pihet
2012-10-30 8:54 ` Jean Pihet
2012-10-30 11:23 ` Paul Walmsley
2012-10-30 11:23 ` Paul Walmsley
2012-10-31 8:18 ` Jean Pihet
2012-10-31 8:18 ` Jean Pihet
2012-10-23 19:17 ` Kevin Hilman
2012-10-23 19:17 ` Kevin Hilman
2012-10-23 19:18 ` Paul Walmsley
2012-10-23 19:18 ` Paul Walmsley
2012-10-20 6:24 ` Paul Walmsley
2012-10-20 6:24 ` Paul Walmsley
2012-10-22 17:53 ` Kevin Hilman
2012-10-22 17:53 ` Kevin Hilman
2012-10-22 20:44 ` Kevin Hilman
2012-10-22 20:44 ` Kevin Hilman
2012-10-20 14:11 ` Richard Cochran
2012-10-20 14:11 ` Richard Cochran
2012-10-20 16:27 ` Paul Walmsley
2012-10-20 16:27 ` Paul Walmsley
2012-10-20 18:01 ` Richard Cochran
2012-10-20 18:01 ` Richard Cochran
2012-10-20 18:12 ` Paul Walmsley
2012-10-20 18:12 ` Paul Walmsley
2012-10-20 18:37 ` Richard Cochran
2012-10-20 18:37 ` Richard Cochran
2012-10-20 18:58 ` Paul Walmsley
2012-10-20 18:58 ` Paul Walmsley
2012-10-21 13:51 ` Matt Porter
2012-10-21 13:51 ` Matt Porter
2012-10-21 16:26 ` Paul Walmsley
2012-10-21 16:26 ` Paul Walmsley
2012-10-22 21:56 ` Kevin Hilman
2012-10-22 21:56 ` Kevin Hilman
2012-10-21 7:35 ` Richard Cochran
2012-10-21 7:35 ` Richard Cochran
2012-10-21 8:23 ` Paul Walmsley
2012-10-21 8:23 ` Paul Walmsley
2012-10-21 11:44 ` Richard Cochran
2012-10-21 11:44 ` Richard Cochran
2012-10-21 16:24 ` Paul Walmsley
2012-10-21 16:24 ` Paul Walmsley
2012-10-21 12:29 ` Mohammed, Afzal
2012-10-21 12:29 ` Mohammed, Afzal
2012-10-21 12:36 ` Richard Cochran
2012-10-21 12:36 ` Richard Cochran
2012-10-20 17:20 ` Paul Walmsley
2012-10-20 17:20 ` Paul Walmsley
2012-10-22 16:13 ` Tero Kristo
2012-10-22 16:13 ` Tero Kristo
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