linux-kernel - Re: [PATCH] ASoC: DaVinci: Added support for cpu clocking I2S

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Date:	Mon, 28 Jun 2010 12:11:13 -0700
From:	Troy Kisky <troy.kisky@...ndarydevices.com>
To:	Raffaele Recalcati <lamiaposta71@...il.com>
Cc:	davinci-linux-open-source@...ux.davincidsp.com,
	alsa-devel@...a-project.org, Russell King <linux@....linux.org.uk>,
	Takashi Iwai <tiwai@...e.de>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	linux-kernel@...r.kernel.org,
	Davide Bonfanti <davide.bonfanti@...cino.it>,
	Raffaele Recalcati <raffaele.recalcati@...cino.it>,
	Chaithrika U S <chaithrika@...com>,
	Jaroslav Kysela <perex@...ex.cz>,
	linux-arm-kernel@...ts.infradead.org,
	Liam Girdwood <lrg@...mlogic.co.uk>
Subject: Re: [PATCH] ASoC: DaVinci: Added support for cpu clocking I2S

Raffaele Recalcati wrote:
> +		if (dev->i2s_fast_clock) {
> +			clk_div = 256;
can you have
   f = (freq / params->rate_num) * params->rate_den;
> +			do {
> +				framesize = (freq / (--clk_div)) /
> +					    params->rate_num *
> +					    params->rate_den;
and
				framesize = f / (--clk_div);
> +			} while (((framesize < 33) || (framesize > 4095)) &&
> +				 (clk_div));
> +			clk_div--;
looks like clk_div can go negative here, should the above while say (clk_div > 1)
> +			srgr |= DAVINCI_MCBSP_SRGR_FPER(framesize - 1);
> +		} else {
> +			/* symmetric waveforms */
> +			clk_div = freq / (mcbsp_word_length * 16) /
> +				  params->rate_num * params->rate_den;
> +			srgr |= DAVINCI_MCBSP_SRGR_FPER(mcbsp_word_length *
> +							16 - 1);
> +		}
> +		clk_div &= 0xFF;
> +		srgr |= clk_div;
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