linux-kernel - Re: [PATCH] OMAP GPIO - don't wake from suspend unless requested.

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Message-ID: <5048AF1F.8010607@ti.com>
Date:	Thu, 06 Sep 2012 19:41:43 +0530
From:	Shubhrajyoti <shubhrajyoti@...com>
To:	NeilBrown <neilb@...e.de>
CC:	"Shilimkar, Santosh" <santosh.shilimkar@...com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Tarun Kanti DebBarma <tarun.kanti@...com>,
	Kevin Hilman <khilman@...com>,
	Tony Lindgren <tony@...mide.com>, Benoit <b-cousson@...com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Felipe Balbi <balbi@...com>, linux-omap@...r.kernel.org,
	lkml <linux-kernel@...r.kernel.org>,
	Jon Hunter <jon-hunter@...com>
Subject: Re: [PATCH] OMAP GPIO - don't wake from suspend unless requested.

On Thursday 06 September 2012 12:32 PM, NeilBrown wrote:
> From: NeilBrown <neilb@...e.de>
> Subject: [PATCH] OMAP GPIO - don't wake from suspend unless requested.
>
> Current kernel will wake from suspend on an event on any active
> GPIO even if enable_irq_wake() wasn't called.
>
> There are two reasons that the hardware wake-enable bit should be set:
>
> 1/ while non-suspended the CPU might go into a deep sleep (off_mode)
>   in which the wake-enable bit is needed for an interrupt to be
>   recognised.
> 2/ while suspended the GPIO interrupt should wake from suspend if and
>    only if irq_wake as been enabled.
>
> The code currently doesn't keep these two reasons separate so they get
> confused and sometimes the wakeup flags is set incorrectly.
>
> This patch reverts:
>  commit 9c4ed9e6c01e7a8bd9079da8267e1f03cb4761fc
>     gpio/omap: remove suspend/resume callbacks
> and
>  commit 0aa2727399c0b78225021413022c164cb99fbc5e
>     gpio/omap: remove suspend_wakeup field from struct gpio_bank
>
> and makes some minor changes so that we have separate flags for "GPIO
> should wake from deep idle" and "GPIO should wake from suspend".
>
> With this patch, the GPIO from my touch screen doesn't wake my device
> any more, which is what I want.
Just gave it a try fixes a similar issue on my omap4 board as well.
>
> Cc: Kevin Hilman <khilman@...com>
> Cc: Tony Lindgren <tony@...mide.com>
> Cc: Santosh Shilimkar <santosh.shilimkar@...com>
> Cc: Cousson Benoit <b-cousson@...com>
> Cc: Grant Likely <grant.likely@...retlab.ca>
> Cc: Tarun Kanti DebBarma <tarun.kanti@...com>
> Cc: Felipe Balbi <balbi@...com>
> Cc: Govindraj.R <govindraj.raja@...com>
>
> Signed-off-by: NeilBrown <neilb@...e.de>

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