From: khilman@linaro.org (Kevin Hilman)
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: Wed, 03 Apr 2013 13:54:41 -0700 [thread overview]
Message-ID: <87mwtftjvy.fsf@linaro.org> (raw)
In-Reply-To: <1364205910-32392-10-git-send-email-santosh.shilimkar@ti.com> (Santosh Shilimkar's message of "Mon, 25 Mar 2013 15:35:01 +0530")
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?
Also, this sounds like a fix to me, and should probably be broken out
accordingly.
Kevin
next prev parent reply other threads:[~2013-04-03 20:54 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 [this message]
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
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
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