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

[Stefan Bader]

On 13.11.20 17:15, 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(+)
> 
The change to drop firmware appears a bit large but limited in scope and I
believe also in the range of hw which triggers a different behaviour. So with
testing results.


Acked-by: Stefan Bader <stefan.bader at canonical.com>

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