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Date: Mon, 24 Sep 2018 12:54:52 +0200
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: =?utf-8?B?UmFmYcWCIE1pxYJlY2tp?= <zajec5@gmail.com>
Cc: stable@vger.kernel.org, Michal Simek <michal.simek@xilinx.com>,
        Jiri Slaby <jslaby@suse.com>,
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Subject: Re: [PATCH 4.14-4.17 1/2] earlycon: Initialize port->uartclk based
 on clock-frequency property
Message-ID: <20180924105452.GC16476@kroah.com>
References: <20180923223446.3773-1-zajec5@gmail.com>
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On Mon, Sep 24, 2018 at 12:34:45AM +0200, Rafał Miłecki wrote:
> From: Michal Simek <michal.simek@xilinx.com>
> 
> commit 814453adea7d081ad8917aa0f32d6a14165a3563 upstream.
> 
> On DT based platforms when current-speed property is present baudrate
> is setup. Also port->uartclk is initialized to bogus BASE_BAUD * 16
> value. Drivers like uartps/ns16550 contain logic when baudrate and
> uartclk is used for baudrate calculation.
> 
> The patch is reading optional clock-frequency property to replace bogus
> BASE_BAUD * 16 calculation to have proper baudrate calculation.
> 
> [-stable comment: commit 31cb9a8575ca ("earlycon: initialise baud field
>  of earlycon device structure") has changed 8250_early.c behavior which
>  now tries to setup UART speed. Ignoring clock-frequency results in
>  wrong value of calculated divisor & malformed early console output.]

Thanks for both of these, now queued up.

greg k-h