linux-kernel - RE: [PATCH] Bluetooth: btrtl: Ask ic

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Date:   Tue, 5 Oct 2021 05:26:53 +0000
From:   Hilda Wu <hildawu@...ltek.com>
To:     Marcel Holtmann <marcel@...tmann.org>
CC:     Johan Hedberg <johan.hedberg@...il.com>,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>,
        "linux-bluetooth@...r.kernel.org" <linux-bluetooth@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kai.heng.feng@...onical.com" <kai.heng.feng@...onical.com>,
        "apusaka@...omium.org" <apusaka@...omium.org>,
        Max Chou <max.chou@...ltek.com>,
        "alex_lu@...lsil.com.cn" <alex_lu@...lsil.com.cn>,
        KidmanLee <kidman@...ltek.com>
Subject: RE: [PATCH] Bluetooth: btrtl: Ask ic_info to drop firmware

Hi Marcel,

Thank you for your review and suggestions.

The MSFT extension has a HCI_VS_MSFT_Read_Supported_Features command. The AOSP extension has a read capability cmd too.
https://docs.microsoft.com/en-us/windows-hardware/drivers/bluetooth/microsoft-defined-bluetooth-hci-commands-and-events#hci_vs_msft_read_supported_features
https://source.android.com/devices/bluetooth/hci_requirements#vendor-specific-capabilities
If commands did not support, the controller should feedback event status as Unknown HCI Command (0x01).
We can go on this way.

Regards,
Hilda

-----Original Message-----
From: Marcel Holtmann <marcel@...tmann.org> 
Sent: Friday, October 1, 2021 5:42 PM
To: Hilda Wu <hildawu@...ltek.com>
Cc: Johan Hedberg <johan.hedberg@...il.com>; Luiz Augusto von Dentz <luiz.dentz@...il.com>; linux-bluetooth@...r.kernel.org; linux-kernel@...r.kernel.org; kai.heng.feng@...onical.com; apusaka@...omium.org; Max Chou <max.chou@...ltek.com>; alex_lu@...lsil.com.cn; KidmanLee <kidman@...ltek.com>
Subject: Re: [PATCH] Bluetooth: btrtl: Ask ic_info to drop firmware

Hi Hilda,

> Some un-support wakeup platforms keep USB power and suspend signal is 
> coming late, this makes Realtek some chip keep its firmware, and make 
> it never load new firmware.
> 
> So use vendor specific HCI command to ask them drop its firmware after 
> system shutdown or resume.
> 
> Signed-off-by: Hilda Wu <hildawu@...ltek.com>
> ---
> drivers/bluetooth/btrtl.c | 12 +++++++-----
> 1 file changed, 7 insertions(+), 5 deletions(-)

patch has been applied to bluetooth-next tree.

Btw. is there a simple way (via vendor HCI commands or similar) to tell which RTL device supports the MSFT or AOSP extensions. I rather have this done once and not keep hacking it over and over again.

Regards

Marcel

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