APPLIED [OEM-5.6] Re: [SRU] [F/G/Unstable/OEM-5.6] [PATCH 0/2] Ask 8821C Bluetooth controller to drop old firmware

[Timo Aaltonen]

On 13.11.2020 18.15, Kai-Heng Feng wrote:
> BugLink: https://bugs.launchpad.net/bugs/1904221
> 
> [Impact]
> Some platforms may keep USB power in S3/S4/S5, so Realtek 8821C retains
> its firmware even with a cold boot.
> 
> [Fix]
> Use vendor command to drop firmware if the version is old.
> 
> [Test case]
> Use dmesg to check if new firmware is loaded.
> With the patch applied, we can find new firmware is loaded.
> 
> [Where problems could occur]
> There's a 200ms delay which can slow down when BT controller is opened
> by userspace first time.
> 
> Colin Ian King (1):
>    Bluetooth: btrtl: fix incorrect skb allocation failure check
> 
> Kai-Heng Feng (1):
>    Bluetooth: btrtl: Ask 8821C to drop old firmware
> 
>   drivers/bluetooth/btrtl.c | 46 +++++++++++++++++++++++++++++++++++++++
>   1 file changed, 46 insertions(+)
> 

applied to oem-5.6, thanks

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