linux-kernel - Re: [PATCH] pinctrl: qcom: use restart_notifier mechanism for ps

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Date:	Thu, 18 Sep 2014 16:02:19 -0700
From:	Kumar Gala <galak@...eaurora.org>
To:	Josh Cartwright <joshc@...eaurora.org>
Cc:	Bjorn Andersson <bjorn.andersson@...ymobile.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-arm-msm@...r.kernel.org,
	Pramod Gurav <pramod.gurav@...rtplayin.com>,
	Guenter Roeck <linux@...ck-us.net>
Subject: Re: [PATCH] pinctrl: qcom: use restart_notifier mechanism for ps_hold


On Sep 18, 2014, at 3:49 PM, Josh Cartwright <joshc@...eaurora.org> wrote:

> On Thu, Sep 18, 2014 at 03:47:20PM -0700, Kumar Gala wrote:
>> On Sep 18, 2014, at 3:32 PM, Josh Cartwright <joshc@...eaurora.org> wrote:
>> 
>>> By converting to the restart_notifier mechanism for restart, we allow
>>> for other mechanisms, like the watchdog, to be used for restart in the
>>> case where PS_HOLD has failed to reset the chip.
>>> 
>>> Choose priority 128, as according to documentation, this mechanism "is
>>> sufficient to restart the entire system?.
>> 
>> Will we use a higher priority for watchdog?  or how would we fail over to watchdog?
> 
> The registered restart handlers are called in (descending) priority
> order.  This driver registers as 128, but conceivably there could be
> some super-board-specific restart mechanism that can register itself as
> higher priority than this and it will be attempted first.
> 
> If PS_HOLD doesn't work, the lower priority restart handlers will
> continue to be called, including the watchdog, which is registering with
> the lowest priority (0).

Cool, thanks.

- k
-- 
Employee of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation

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