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

[Shubhrajyoti <shubhrajyoti@ti.com>]

On Thursday 06 September 2012 12:32 PM, NeilBrown wrote:
> From: NeilBrown <neilb@suse.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@ti.com>
> Cc: Tony Lindgren <tony@atomide.com>
> Cc: Santosh Shilimkar <santosh.shilimkar@ti.com>
> Cc: Cousson Benoit <b-cousson@ti.com>
> Cc: Grant Likely <grant.likely@secretlab.ca>
> Cc: Tarun Kanti DebBarma <tarun.kanti@ti.com>
> Cc: Felipe Balbi <balbi@ti.com>
> Cc: Govindraj.R <govindraj.raja@ti.com>
>
> Signed-off-by: NeilBrown <neilb@suse.de>