From: s-anna@ti•com (Suman Anna)
To: linux-arm-kernel@lists•infradead.org
Subject: Boot hang regression 3.10.0-rc4 -> 3.10.0
Date: Thu, 11 Jul 2013 19:40:47 -0500 [thread overview]
Message-ID: <51DF508F.3050703@ti.com> (raw)
In-Reply-To: <51DE8215.5060306@ti.com>
On 07/11/2013 04:59 AM, Grygorii Strashko wrote:
> Hi,
>
> On 07/11/2013 09:32 AM, Tony Lindgren wrote:
>> * Felipe Balbi <balbi@ti•com> [130710 09:18]:
>>>
>>> On Wed, Jul 10, 2013 at 07:07:04PM +0300, Felipe Balbi wrote:
>>>> how about something like below ? It makes omap_device/hwmod and
>>>> pm_runtime agree on the initial state of the device and will prevent
>>>> ->runtime_resume() from being called on first pm_runtime_get*() done
>>>> during probe.
>>>>
>>>> This is similar to what PCI bus does (if you look at pci_pm_init()).
>>>>
>>>> commit 59108a500b4ab4b1a5102648a3360276dbf7df6f
>>>> Author: Felipe Balbi <balbi@ti•com>
>>>> Date: Wed Jul 10 18:50:16 2013 +0300
>>>>
>>>> arm: omap2plus: unidle devices which are about to probe
>>>>
>>>> in order to make HWMOD and pm_runtime agree on the
>>>> initial state of the device, we will unidle the device
>>>> and call pm_runtime_set_active() to tell pm_runtime
>>>> that the device is really active.
> Don't think that it's good idea (
> I've checked some driver's and think this patch will enable some devices
> unpredictably:
> - hwspinlock
> - mailbox
> - iommu
> - ipu
> All above devices need to be enabled on demand only (no
> pm_runtime_get*() calls in probe). More over, some of them have very
> specific enabling sequence - like ipu).
>
> May be Summan can say more on that.
Indeed, this is a problem for any of the slave processor devices.
mailbox and iommu would be slaves to the remoteproc and the drivers have
a specific sequence of bringing up a processor. The current
hwmod/omap_device code is such that these devices will be left in reset
and the driver code use the omap_device_(de)assert_hardreset API
together with omap_device_enable code to bring up the devices. The
remoteproc driver also needs to assert the resets (there are other
problems associated with using omap_device_idle for remoteproc and
iommu) for bringing up the devices after a suspend sequence. hwspinlock
and mailbox may get away since they are in CORE domain, but definitely
an issue for iommu and remoteproc. I would think that this would also
affect other compute devices like IVAHD, ISS, SGX.
regards
Suman
>
>>>>
>>>> By the time driver's probe() is reached, a call to
>>>> pm_runtime_get_sync() will not cause driver's
>>>> ->runtime_resume() method to be called at first, only
>>>> after a successful ->runtime_suspend().
>>>>
>>>> Signed-off-by: Felipe Balbi <balbi@ti•com>
>>>
>>> btw, this is RFC, haven't tested at all.
>>
>> Yes it does not compile, then removing the extra ; at the end
>> of the functions, it oopses with a NULL pointer exception.
>>
>> Regards,
>>
>> Tony
>> --
>> To unsubscribe from this list: send the line "unsubscribe linux-omap" in
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>>
>
next prev parent reply other threads:[~2013-07-12 0:40 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-04 13:25 Boot hang regression 3.10.0-rc4 -> 3.10.0 Mark Jackson
2013-07-04 15:14 ` Mark Jackson
2013-07-04 16:00 ` Mark Jackson
2013-07-05 8:11 ` Bedia, Vaibhav
2013-07-05 11:59 ` Tony Lindgren
2013-07-05 13:20 ` Bedia, Vaibhav
2013-07-05 13:31 ` Bedia, Vaibhav
2013-07-08 11:25 ` Tony Lindgren
2013-07-08 12:16 ` Tony Lindgren
2013-07-08 12:41 ` Rajendra Nayak
2013-07-08 13:10 ` Tony Lindgren
2013-07-08 13:20 ` Rajendra Nayak
2013-07-08 13:25 ` Rajendra Nayak
2013-07-08 13:35 ` Felipe Balbi
2013-07-09 5:33 ` Rajendra Nayak
2013-07-09 6:42 ` Felipe Balbi
2013-07-09 7:19 ` Rajendra Nayak
2013-07-09 7:40 ` Felipe Balbi
2013-07-09 18:59 ` Grygorii Strashko
2013-07-09 19:41 ` Felipe Balbi
2013-07-10 12:16 ` Grygorii Strashko
2013-07-10 12:25 ` Felipe Balbi
2013-07-10 8:22 ` Kevin Hilman
2013-07-10 12:10 ` Tony Lindgren
2013-07-10 12:27 ` Tony Lindgren
2013-07-10 14:26 ` Tony Lindgren
2013-07-10 16:07 ` Felipe Balbi
2013-07-10 16:11 ` Felipe Balbi
2013-07-11 6:32 ` Tony Lindgren
2013-07-11 9:59 ` Grygorii Strashko
2013-07-12 0:40 ` Suman Anna [this message]
2013-07-15 6:44 ` Rajendra Nayak
2013-07-15 10:01 ` Rajendra Nayak
2013-07-15 19:23 ` Suman Anna
2013-07-16 6:30 ` Rajendra Nayak
2013-07-11 9:17 ` Rajendra Nayak
2013-07-11 9:26 ` Felipe Balbi
2013-07-11 10:16 ` [PATCH] arm: omap2plus: unidle devices which are about to probe Felipe Balbi
2013-07-12 11:58 ` Grygorii Strashko
2013-07-12 12:10 ` Felipe Balbi
2013-07-12 12:27 ` Rajendra Nayak
2013-07-13 22:21 ` Kevin Hilman
2013-07-11 9:59 ` Boot hang regression 3.10.0-rc4 -> 3.10.0 Grygorii Strashko
2013-07-16 10:27 ` Grygorii Strashko
2013-07-17 7:10 ` Rajendra Nayak
2013-07-11 6:18 ` Rajendra Nayak
2013-07-11 6:24 ` Tony Lindgren
2013-07-11 9:11 ` Rajendra Nayak
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