linux-kernel - Re: [PATCH v2 2/2] Input: pm8941-pwrkey - Respect reboot

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Date:   Sun, 25 Jul 2021 21:34:12 +0200
From:   Luca Weiss <luca@...tu.xyz>
To:     Dmitry Torokhov <dmitry.torokhov@...il.com>,
        Shawn Guo <shawn.guo@...aro.org>
Cc:     Bjorn Andersson <bjorn.andersson@...aro.org>,
        Matteo Croce <mcroce@...rosoft.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Petr Mladek <pmladek@...e.com>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        linux-arm-msm@...r.kernel.org, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org, Shawn Guo <shawn.guo@...aro.org>
Subject: Re: [PATCH v2 2/2] Input: pm8941-pwrkey - Respect reboot_mode for warm reset

Hi Shawn,

On Mittwoch, 14. Juli 2021 11:58:49 CEST Shawn Guo wrote:
> On some devices, e.g. Sony Xperia M4 Aqua, warm reset is used to reboot
> device into bootloader and recovery mode.  Instead of always doing hard
> reset, add a check on reboot_mode for possible warm reset.
> 
> Signed-off-by: Shawn Guo <shawn.guo@...aro.org>

Tested-by: Luca Weiss <luca@...tu.xyz>

Rebooting into bootloader works on fairphone-fp2 with these commands now:

$ echo warm > /sys/kernel/reboot/mode
$ reboot-mode bootloader

reboot-mode is this small utility:
https://gitlab.com/postmarketOS/reboot-mode/-/blob/master/reboot-mode.c

Regards
Luca

> ---
>  drivers/input/misc/pm8941-pwrkey.c | 6 +++++-
>  1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/input/misc/pm8941-pwrkey.c
> b/drivers/input/misc/pm8941-pwrkey.c index cf8104454e74..9b14d6eb1918
> 100644
> --- a/drivers/input/misc/pm8941-pwrkey.c
> +++ b/drivers/input/misc/pm8941-pwrkey.c
> @@ -27,6 +27,7 @@
>  #define PON_PS_HOLD_RST_CTL2		0x5b
>  #define  PON_PS_HOLD_ENABLE		BIT(7)
>  #define  PON_PS_HOLD_TYPE_MASK		0x0f
> +#define  PON_PS_HOLD_TYPE_WARM_RESET	1
>  #define  PON_PS_HOLD_TYPE_SHUTDOWN	4
>  #define  PON_PS_HOLD_TYPE_HARD_RESET	7
> 
> @@ -93,7 +94,10 @@ static int pm8941_reboot_notify(struct notifier_block
> *nb, break;
>  	case SYS_RESTART:
>  	default:
> -		reset_type = PON_PS_HOLD_TYPE_HARD_RESET;
> +		if (reboot_mode == REBOOT_WARM)
> +			reset_type = PON_PS_HOLD_TYPE_WARM_RESET;
> +		else
> +			reset_type = PON_PS_HOLD_TYPE_HARD_RESET;
>  		break;
>  	}