linux-kernel - Re: [Bug] staging: rtl8723bs: Bluetooth stops working after patch: serial: 8250_dw: Do not reclock if already at correct rate

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Date: Tue, 14 May 2024 15:55:41 +0300
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Philipp Hortmann <philipp.g.hortmann@...il.com>
Cc: linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jirislaby@...nel.org>, linux-serial@...r.kernel.org,
	Peter Collingbourne <pcc@...gle.com>
Subject: Re: [Bug] staging: rtl8723bs: Bluetooth stops working after patch:
 serial: 8250_dw: Do not reclock if already at correct rate

On Tue, May 14, 2024 at 06:32:37AM +0200, Philipp Hortmann wrote:
> Hi,
> 
> I have a ODYS Trendbook next 14 with the wlan/bluetooth module rtl8723bs.
> 
> Bluetooth stops working with the following commit:
> commit e5d6bd25f93d6ae158bb4cd04956cb497a85b8ef (HEAD)
> Author: Peter Collingbourne <pcc@...gle.com>
> Date:   Thu Feb 22 11:26:34 2024 -0800
>     serial: 8250_dw: Do not reclock if already at correct rate
> 
> Please find dmesg below. Module has issues to load firmware.
> 
> To enshure that this is the function breaking commit I applied the commit
> reversed on top of the latest kernel from the staging tree. Then bluetooth
> is working again.
> 
> I can support with further tests. I do not have a good proposal for a fix as
> I expect a lot of side effects. Please send me proposals for a fix.

The revert is in the tree IIRC.
7dfae6cbadc1 ("serial: 8250_dw: Revert: Do not reclock if already at correct rate")

First appeared in v6.9-rc5.

-- 
With Best Regards,
Andy Shevchenko