linux-kernel - Re: [PATCH] platform/x86: msi-laptop: Fix rfkill out-of-sync on MSI Wind U100

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Message-ID: <8ceb0052-f402-0217-2889-f9ef48a5f11f@redhat.com>
Date:   Tue, 25 Jul 2023 16:37:21 +0200
From:   Hans de Goede <hdegoede@...hat.com>
To:     Maxim Mikityanskiy <maxtram95@...il.com>,
        "Lee, Chun-Yi" <jlee@...e.com>, Mark Gross <markgross@...nel.org>
Cc:     Matthew Garrett <matthew.garrett@...ula.com>,
        Matthew Garrett <mjg59@...f.ucam.org>,
        platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] platform/x86: msi-laptop: Fix rfkill out-of-sync on MSI
 Wind U100

Hi,

On 7/21/23 16:54, Maxim Mikityanskiy wrote:
> Only the HW rfkill state is toggled on laptops with quirks->ec_read_only
> (so far only MSI Wind U90/U100). There are, however, a few issues with
> the implementation:
> 
> 1. The initial HW state is always unblocked, regardless of the actual
>    state on boot, because msi_init_rfkill only sets the SW state,
>    regardless of ec_read_only.
> 
> 2. The initial SW state corresponds to the actual state on boot, but it
>    can't be changed afterwards, because set_device_state returns
>    -EOPNOTSUPP. It confuses the userspace, making Wi-Fi and/or Bluetooth
>    unusable if it was blocked on boot, and breaking the airplane mode if
>    the rfkill was unblocked on boot.
> 
> Address the above issues by properly initializing the HW state on
> ec_read_only laptops and by allowing the userspace to toggle the SW
> state. Don't set the SW state ourselves and let the userspace fully
> control it. Toggling the SW state is a no-op, however, it allows the
> userspace to properly toggle the airplane mode. The actual SW radio
> disablement is handled by the corresponding rtl818x_pci and btusb
> drivers that have their own rfkills.
> 
> Tested on MSI Wind U100 Plus, BIOS ver 1.0G, EC ver 130.
> 
> Fixes: 0816392b97d4 ("msi-laptop: merge quirk tables to one")
> Fixes: 0de6575ad0a8 ("msi-laptop: Add MSI Wind U90/U100 support")
> Signed-off-by: Maxim Mikityanskiy <maxtram95@...il.com>

Thank you for your patch, I've applied this patch to my fixes
branch:
https://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86.git/log/?h=fixes

Note it will show up in my fixes branch once I've pushed my
local branch there, which might take a while.

I will include this patch in my next fixes pull-req to Linus
for the current kernel development cycle.

Regards,

Hans



> ---
>  drivers/platform/x86/msi-laptop.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/platform/x86/msi-laptop.c b/drivers/platform/x86/msi-laptop.c
> index 6b18ec543ac3..f4c6c36e05a5 100644
> --- a/drivers/platform/x86/msi-laptop.c
> +++ b/drivers/platform/x86/msi-laptop.c
> @@ -208,7 +208,7 @@ static ssize_t set_device_state(const char *buf, size_t count, u8 mask)
>  		return -EINVAL;
>  
>  	if (quirks->ec_read_only)
> -		return -EOPNOTSUPP;
> +		return 0;
>  
>  	/* read current device state */
>  	result = ec_read(MSI_STANDARD_EC_COMMAND_ADDRESS, &rdata);
> @@ -838,15 +838,15 @@ static bool msi_laptop_i8042_filter(unsigned char data, unsigned char str,
>  static void msi_init_rfkill(struct work_struct *ignored)
>  {
>  	if (rfk_wlan) {
> -		rfkill_set_sw_state(rfk_wlan, !wlan_s);
> +		msi_rfkill_set_state(rfk_wlan, !wlan_s);
>  		rfkill_wlan_set(NULL, !wlan_s);
>  	}
>  	if (rfk_bluetooth) {
> -		rfkill_set_sw_state(rfk_bluetooth, !bluetooth_s);
> +		msi_rfkill_set_state(rfk_bluetooth, !bluetooth_s);
>  		rfkill_bluetooth_set(NULL, !bluetooth_s);
>  	}
>  	if (rfk_threeg) {
> -		rfkill_set_sw_state(rfk_threeg, !threeg_s);
> +		msi_rfkill_set_state(rfk_threeg, !threeg_s);
>  		rfkill_threeg_set(NULL, !threeg_s);
>  	}
>  }