linux-kernel - Re: [PATCH] serial: 8250_dw: support high baudrates if possible

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Message-ID: <20140628163608.0c5536a9@alan.etchedpixels.co.uk>
Date:	Sat, 28 Jun 2014 16:36:08 +0100
From:	One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
To:	Alex Elder <elder@...aro.org>
Cc:	gregkh@...uxfoundation.org, heikki.krogerus@...ux.intel.com,
	david.daney@...ium.com, loic.poulain@...el.com,
	linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] serial: 8250_dw: support high baudrates if possible

On Fri, 27 Jun 2014 12:25:20 -0500
> +		rate = 16 * max(115200U, (unsigned int)baud);
> +

This assumes an arbitarily configurable clock, which is not I think the
usual case. 
> +		/*
> +		 * Request a different clock rate if necessary, and
> +		 * record it if successful.
> +		 */
> +		if (rate != p->uartclk) {
> +			BUG_ON(!data->clk);
> +			if (!clk_set_rate(data->clk, (unsigned long)rate))
> +				p->uartclk = rate;
> +		}


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