linux-kernel - Re: [PATCH] Input: i8042 - Fix KBD port cannot wake up system from suspend-to-idle

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Date:   Fri, 13 Apr 2018 14:57:46 -0700
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Kai-Heng Feng <kai.heng.feng@...onical.com>
Cc:     linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Input: i8042 - Fix KBD port cannot wake up system from
 suspend-to-idle

On Wed, Apr 11, 2018 at 04:59:05PM +0800, Kai-Heng Feng wrote:
> Commit f13b2065de81 ("Input: i8042 - allow KBD and AUX ports to wake up
> from suspend-to-idle") make system in s2idle can be woken up by i8042
> keyboard, but it's disabled by default.
> 
> In commit 3e6e15a862a0 ("Input: enable remote wakeup for PNP i8042
> keyboard ports") states that "Keyboard ports are always supposed to be
> wakeup-enabled", it should be enabled by default. Keyboard wakeup from
> s2idles is also the default behavior for other OSes.
> 
> But right now we can't wake up the system by keyboard, from s2idle.
> 
> In i8042_probe(), device_set_wakeup_enable(), which gets called by
> i8042_pnp_kbd_probe(), runs before device_set_wakeup_capable(), which
> gets called by i8042_register_ports(). So device_set_wakeup_enable()
> doesn't really enable wakeup for keyboard.

You are talking about 2 different devices here, one representing PNP and
another KBD serio port. Unfortunately there is not really a link between
the 2.

> 
> We can enable keyboard wakeup in i8042_register_ports() directly.

No, the world is not all x86, what makes sense for x86 does not
necessarily work for other architectures. We need to come up with a way
for tying PNP devices and i8042 ports for x86 case.

> 
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
> ---
>  drivers/input/serio/i8042-x86ia64io.h | 3 ---
>  drivers/input/serio/i8042.c           | 4 ++++
>  2 files changed, 4 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/input/serio/i8042-x86ia64io.h b/drivers/input/serio/i8042-x86ia64io.h
> index b353d494ad40..e3def9195c2a 100644
> --- a/drivers/input/serio/i8042-x86ia64io.h
> +++ b/drivers/input/serio/i8042-x86ia64io.h
> @@ -925,9 +925,6 @@ static int i8042_pnp_kbd_probe(struct pnp_dev *dev, const struct pnp_device_id *
>  	i8042_pnp_id_to_string(dev->id, i8042_kbd_firmware_id,
>  			       sizeof(i8042_kbd_firmware_id));
>  
> -	/* Keyboard ports are always supposed to be wakeup-enabled */
> -	device_set_wakeup_enable(&dev->dev, true);
> -
>  	i8042_pnp_kbd_devices++;
>  	return 0;
>  }
> diff --git a/drivers/input/serio/i8042.c b/drivers/input/serio/i8042.c
> index 824f4c1c1f31..21a16b757931 100644
> --- a/drivers/input/serio/i8042.c
> +++ b/drivers/input/serio/i8042.c
> @@ -1400,6 +1400,10 @@ static void __init i8042_register_ports(void)
>  				i8042_ports[i].irq);
>  			serio_register_port(serio);
>  			device_set_wakeup_capable(&serio->dev, true);
> +
> +			/* Keyboard ports are always supposed to be wakeup-enabled */
> +			if (i == I8042_KBD_PORT_NO)
> +				device_wakeup_enable(&serio->dev);
>  		}
>  	}
>  }
> -- 
> 2.17.0
> 

Thanks.

-- 
Dmitry