linux-kernel - Re: [PATCH v2] serial: 8250_bcm7271: use default_mux

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Message-ID: <62cf51b8-0597-4e42-bdc2-54f01ecb91e1@broadcom.com>
Date: Wed, 24 Apr 2024 15:51:12 -0700
From: Florian Fainelli <florian.fainelli@...adcom.com>
To: Doug Berger <opendmb@...il.com>, Al Cooper <alcooperx@...il.com>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: bcm-kernel-feedback-list@...adcom.com, Jiri Slaby <jirislaby@...nel.org>,
 linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org,
 stable@...r.kernel.org
Subject: Re: [PATCH v2] serial: 8250_bcm7271: use default_mux_rate if possible

On 4/24/24 15:25, Doug Berger wrote:
> There is a scenario when resuming from some power saving states
> with no_console_suspend where console output can be generated
> before the 8250_bcm7271 driver gets the opportunity to restore
> the baud_mux_clk frequency. Since the baud_mux_clk is at its
> default frequency at this time the output can be garbled until
> the driver gets the opportunity to resume.
> 
> Since this is only an issue with console use of the serial port
> during that window and the console isn't likely to use baud
> rates that require alternate baud_mux_clk frequencies, allow the
> driver to select the default_mux_rate if it is accurate enough.
> 
> Fixes: 41a469482de2 ("serial: 8250: Add new 8250-core based Broadcom STB driver")
> Cc: stable@...r.kernel.org
> Signed-off-by: Doug Berger <opendmb@...il.com>

Reviewed-by: Florian Fainelli <florian.fainelli@...adcom.com>
Tested-by: Florian Fainelli <florian.fainelli@...adcom.com>

Thanks!
-- 
Florian


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