From: santosh.shilimkar@ti•com (Santosh Shilimkar)
To: linux-arm-kernel@lists•infradead.org
Subject: [PATCH v2 09/18] ARM: OMAP4+: PM: Restore CPU power state to ON with clockdomain force wakeup method
Date: Fri, 5 Apr 2013 17:28:22 +0530 [thread overview]
Message-ID: <515EBC5E.6090705@ti.com> (raw)
In-Reply-To: <515E9435.6050007@ti.com>
On Friday 05 April 2013 02:37 PM, Santosh Shilimkar wrote:
> On Thursday 04 April 2013 11:12 PM, Kevin Hilman wrote:
>> Santosh Shilimkar <santosh.shilimkar@ti•com> writes:
>>
>>> On Thursday 04 April 2013 02:24 AM, Kevin Hilman wrote:
>>>> Santosh Shilimkar <santosh.shilimkar@ti•com> writes:
>>>>
>>>>> While waking up CPU from off state using clock domain force wakeup, restore
>>>>> the CPU power state to ON state before putting CPU clock domain under
>>>>> hardware control. Otherwise CPU wakeup might fail. The change is recommended
>>>>> for all OMAP4+ devices though the PRCM weakness was observed on OMAP5
>>>>> devices first.
>>>>
>>>> Sounds reasonable, but can you describe the "weakness" a little more?
>>>>
>>>> IOW, what exactly happens if this is not done? It sounds like the CPU
>>>> might immediately go back to retention, but how does that happen unless
>>>> it does a WFI?
>>>>
>>> Its more of lock-up inside the hardware state machine and results
>>> are UN-predictable. We have seen hard-locks most of the time where system
>>> is just frozen. The hardware gets into wrong state machine if the power
>>> domain state isn't restored. I will add this information to changelog.
>>>
>>>> Also, this sounds like a fix to me, and should probably be broken out
>>>> accordingly.
>>>>
>>> Yeah. You mean a separate patch from the series, right ? This patch
>>> actually can be independently added.
>>>
>>> In case you decide to apply it for the fixes branch, updated patch
>>> at end of the email.
>>
>> Curious which branch you applied it to? It didn't apply cleanly to
>> v3.9-rc5 (but did with fuzz).
>>
> Mostly applied on top of the Tony's pull request branches.
>
>> So I've now added it to my for_3.10/fixes/pm branch.
>>
> Thanks. I will pull that in to re-base other patches.
>
While pulling your 'for_3.10/fixes/pm' branch on top
of Tony's pull request[1] sent to arm-soc already.
In my tree, I had pulled Tony's couple of pull requests.
Regards,
Santosh
[1] http://www.spinics.net/lists/arm-kernel/msg235788.html
next prev parent reply other threads:[~2013-04-05 11:58 UTC|newest]
Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-03-25 10:04 [PATCH v2 00/18] ARM: OMAP5: PM: Add MPUSS suspend and CPUidle support Santosh Shilimkar
2013-03-25 10:04 ` [PATCH v2 01/18] ARM: OMAP4+: PM: Consolidate MPU subsystem PM code for re-use Santosh Shilimkar
2013-04-03 19:44 ` Kevin Hilman
2013-04-04 11:32 ` Santosh Shilimkar
2013-03-25 10:04 ` [PATCH v2 02/18] ARM: OMAP5: PM: Update CPU context register offset Santosh Shilimkar
2013-03-25 10:04 ` [PATCH v2 03/18] ARM: OMAP4+: PM: Consolidate and use OMAP4 PM code for OMAP5 Santosh Shilimkar
2013-04-03 20:20 ` Kevin Hilman
2013-04-04 11:51 ` Santosh Shilimkar
2013-04-04 11:55 ` Santosh Shilimkar
2013-03-25 10:04 ` [PATCH v2 04/18] ARM: OMAP5: PM: Set MPUSS-EMIF clock-domain static dependency Santosh Shilimkar
2013-03-25 10:04 ` [PATCH v2 05/18] ARM: OMAP5: PM: Enables ES2 PM mode by default Santosh Shilimkar
2013-04-03 20:25 ` Kevin Hilman
2013-04-04 12:02 ` Santosh Shilimkar
2013-03-25 10:04 ` [PATCH v2 06/18] ARM: OMAP5: PM: Enable Mercury retention mode on CPUx powerdomains Santosh Shilimkar
2013-04-03 20:31 ` Kevin Hilman
2013-04-04 12:08 ` Santosh Shilimkar
2013-03-25 10:04 ` [PATCH v2 07/18] ARM: OMAP5: Add init_late() hook to enable pm initialization Santosh Shilimkar
2013-04-03 20:33 ` Kevin Hilman
2013-04-04 12:28 ` Santosh Shilimkar
2013-03-25 10:05 ` [PATCH v2 08/18] ARM: OMAP5: PM: Add CPU power off in hotplug path Santosh Shilimkar
2013-04-03 20:49 ` Kevin Hilman
2013-04-04 13:23 ` Santosh Shilimkar
2013-04-04 17:31 ` Kevin Hilman
2013-04-05 9:04 ` Santosh Shilimkar
2013-03-25 10:05 ` [PATCH v2 09/18] ARM: OMAP4+: PM: Restore CPU power state to ON with clockdomain force wakeup method Santosh Shilimkar
2013-04-03 20:54 ` Kevin Hilman
2013-04-04 13:37 ` Santosh Shilimkar
2013-04-04 17:42 ` Kevin Hilman
2013-04-05 9:07 ` Santosh Shilimkar
2013-04-05 11:58 ` Santosh Shilimkar [this message]
2013-03-25 10:05 ` [PATCH v2 10/18] ARM: OMAP5: PM: Add MPU Open Switch Retention support Santosh Shilimkar
2013-03-25 10:05 ` [PATCH v2 11/18] ARM: OMAP5: PM: Add L2 memory power down support Santosh Shilimkar
2013-04-03 20:58 ` Kevin Hilman
2013-04-04 13:46 ` Santosh Shilimkar
2013-03-25 10:05 ` [PATCH v2 12/18] ARM: OMAP4: CPUidle: Avoid double idle driver registration Santosh Shilimkar
2013-04-03 21:03 ` Kevin Hilman
2013-04-04 13:47 ` Santosh Shilimkar
2013-03-25 10:05 ` [PATCH v2 13/18] ARM: OMAP: CPUidle: Unregister drivere on device registration failure Santosh Shilimkar
2013-04-03 21:03 ` Kevin Hilman
2013-04-04 13:48 ` Santosh Shilimkar
2013-03-25 10:05 ` [PATCH v2 14/18] ARM: OMAP4: CPUidle: Make C-state description field more precise Santosh Shilimkar
2013-04-03 21:05 ` Kevin Hilman
2013-04-04 13:48 ` Santosh Shilimkar
2013-03-25 10:05 ` [PATCH v2 15/18] ARM: OMAP4+: CPUidle: Consolidate idle driver for OMAP5 support Santosh Shilimkar
2013-04-03 21:10 ` Kevin Hilman
2013-04-04 14:04 ` Santosh Shilimkar
2013-03-25 10:05 ` [PATCH v2 16/18] ARM: OMAP4+: CPUidle: Deprecate use of omap4_mpuss_read_prev_context_state() Santosh Shilimkar
2013-04-03 21:37 ` Kevin Hilman
2013-04-04 13:59 ` Santosh Shilimkar
2013-03-25 10:05 ` [PATCH v2 17/18] ARM: OMAP4+: CPUidle: Add OMAP5 idle driver support Santosh Shilimkar
2013-04-03 21:25 ` Kevin Hilman
2013-04-04 14:16 ` Santosh Shilimkar
2013-04-04 17:55 ` Kevin Hilman
2013-04-05 9:41 ` Santosh Shilimkar
2013-03-25 10:05 ` [PATCH v2 18/18] ARM: OMAP5: PM: handle device instance for warm reset Santosh Shilimkar
2013-03-25 11:46 ` [PATCH v2 00/18] ARM: OMAP5: PM: Add MPUSS suspend and CPUidle support Lokesh Vutla
2013-03-25 12:10 ` Santosh Shilimkar
2013-03-25 12:27 ` Sourav Poddar
2013-03-25 12:47 ` Rajendra Nayak
2013-03-25 13:00 ` Sourav Poddar
2013-04-03 22:52 ` Kevin Hilman
2013-04-04 14:34 ` Santosh Shilimkar
2013-04-04 16:49 ` Santosh Shilimkar
2013-04-04 17:57 ` Kevin Hilman
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=515EBC5E.6090705@ti.com \
--to=santosh.shilimkar@ti$(echo .)com \
--cc=linux-arm-kernel@lists$(echo .)infradead.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox