Re: [PATCH] Input: pm8941-pwrkey - respect reboot_mode for warm reset

From: Luca Weiss <luca@z3ntu.xyz>
To: Dmitry Torokhov <dmitry.torokhov@gmail.com>,
	Shawn Guo <shawn.guo@linaro.org>
Cc: Bjorn Andersson <bjorn.andersson@linaro.org>,
	linux-arm-msm@vger.kernel.org, linux-input@vger.kernel.org,
	Shawn Guo <shawn.guo@linaro.org>
Subject: Re: [PATCH] Input: pm8941-pwrkey - respect reboot_mode for warm reset
Date: Sun, 11 Jul 2021 11:57:25 +0200	[thread overview]
Message-ID: <1824770.6rn2EVs8mz@g550jk> (raw)
In-Reply-To: <20210629030509.2893-1-shawn.guo@linaro.org>

Hi Shawn,

On Dienstag, 29. Juni 2021 05:05:09 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@linaro.org>
> ---
>  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)

This doesn't compile with CONFIG_INPUT_PM8941_PWRKEY=m

 ERROR: modpost: "reboot_mode" [drivers/input/misc/pm8941-pwrkey.ko] undefined!

Also just to clarify, this is supposed to trigger when rebooting with 
LINUX_REBOOT_CMD_RESTART2 and adding an argument that way, right?

Regards
Luca

> +			reset_type = PON_PS_HOLD_TYPE_WARM_RESET;
> +		else
> +			reset_type = PON_PS_HOLD_TYPE_HARD_RESET;
>  		break;
>  	}