linux-kernel - Re: [patch 2/5] s3cmci: cpufreq support

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Message-ID: <20081012105842.2c327627@mjolnir.drzeus.cx>
Date:	Sun, 12 Oct 2008 10:58:42 +0200
From:	Pierre Ossman <drzeus-mmc@...eus.cx>
To:	Ben Dooks <ben-linux@...ff.org>
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...r.kernel.org,
	Ben Dooks <ben-linux@...ff.org>
Subject: Re: [patch 2/5] s3cmci: cpufreq support

On Fri, 10 Oct 2008 11:32:23 +0100
Ben Dooks <ben-linux@...ff.org> wrote:

> +	host = container_of(nb, struct s3cmci_host, freq_transition);
> +	newclk = clk_get_rate(host->clk);
> +	mmc = host->mmc;
> +
> +	if ((val == CPUFREQ_PRECHANGE && host->clk_rate > newclk) ||
> +	    (val == CPUFREQ_POSTCHANGE && host->clk_rate < newclk)) {

Isn't this backwards? The goal should be to avoid overclocking the
card, so if the old clock (which I assume is clk_rate) is slower than
the new clock (newclk), then we should adjust before the change happens,
temporarily underclocking the card.

(and vice versa for when the old clock is faster than the new clock)

-- 
     -- Pierre Ossman

  Linux kernel, MMC maintainer        http://www.kernel.org
  rdesktop, core developer          http://www.rdesktop.org

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