linux-kernel - Re: [PATCH v3] Fix WWAN device disabled issue after S3 deep

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Date:   Mon, 8 Nov 2021 15:32:56 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     Slark Xiao <slark_xiao@....com>, hmh@....eng.br,
        mgross@...ux.intel.com
Cc:     markpearson@...ovo.com, njoshi1@...ovo.com,
        ibm-acpi-devel@...ts.sourceforge.net,
        platform-driver-x86@...r.kernel.or, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] Fix WWAN device disabled issue after S3 deep

Hi,

On 11/8/21 07:06, Slark Xiao wrote:
> When WWAN device wake from S3 deep, under thinkpad platform,
> WWAN would be disabled. This disable status could be checked
> by command 'nmcli r wwan' or 'rfkill list'.
> 
> Issue analysis as below:
>   When host resume from S3 deep, thinkpad_acpi driver would
> call hotkey_resume() function. Finnaly, it will use
> wan_get_status to check the current status of WWAN device.
> During this resume progress, wan_get_status would always
> return off even WWAN boot up completely.
>   In patch V2, Hans said 'sw_state should be unchanged
> after a suspend/resume. It's better to drop the
> tpacpi_rfk_update_swstate call all together from the
> resume path'.
>   And it's confimed by Lenovo that GWAN is no longer
>  available from WHL generation because the design does not
>  match with current pin control.
> 
> Signed-off-by: Slark Xiao <slark_xiao@....com>

Thanks, patch looks good to me:

Reviewed-by: Hans de Goede <hdegoede@...hat.com>

I will merge this once 5.16-rc1 is out.

Regards,

Hans

> ---
>  drivers/platform/x86/thinkpad_acpi.c | 12 ------------
>  1 file changed, 12 deletions(-)
> 
> diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
> index 50ff04c84650..f1cbd27282e1 100644
> --- a/drivers/platform/x86/thinkpad_acpi.c
> +++ b/drivers/platform/x86/thinkpad_acpi.c
> @@ -1178,15 +1178,6 @@ static int tpacpi_rfk_update_swstate(const struct tpacpi_rfk *tp_rfk)
>  	return status;
>  }
>  
> -/* Query FW and update rfkill sw state for all rfkill switches */
> -static void tpacpi_rfk_update_swstate_all(void)
> -{
> -	unsigned int i;
> -
> -	for (i = 0; i < TPACPI_RFK_SW_MAX; i++)
> -		tpacpi_rfk_update_swstate(tpacpi_rfkill_switches[i]);
> -}
> -
>  /*
>   * Sync the HW-blocking state of all rfkill switches,
>   * do notice it causes the rfkill core to schedule uevents
> @@ -3129,9 +3120,6 @@ static void tpacpi_send_radiosw_update(void)
>  	if (wlsw == TPACPI_RFK_RADIO_OFF)
>  		tpacpi_rfk_update_hwblock_state(true);
>  
> -	/* Sync sw blocking state */
> -	tpacpi_rfk_update_swstate_all();
> -
>  	/* Sync hw blocking state last if it is hw-unblocked */
>  	if (wlsw == TPACPI_RFK_RADIO_ON)
>  		tpacpi_rfk_update_hwblock_state(false);
>