linux-kernel - Re: [PATCH 2/4] ASoC: sunxi: Add Allwinner A10 Digital Audio driver

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Date:	Thu, 9 Jun 2016 23:06:21 +0200
From:	Maxime Ripard <maxime.ripard@...e-electrons.com>
To:	Code Kipper <codekipper@...il.com>
Cc:	Rob Herring <robh+dt@...nel.org>, Chen-Yu Tsai <wens@...e.org>,
	Mark Brown <broonie@...nel.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	devicetree <devicetree@...r.kernel.org>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
	Andrea Venturi <ennesimamail.av@...il.com>,
	gianfranco@...devices.com
Subject: Re: [PATCH 2/4] ASoC: sunxi: Add Allwinner A10 Digital Audio driver

Hi Markus,

On Thu, Jun 02, 2016 at 10:03:21AM +0200, Code Kipper wrote:
> snip
> > +
> > +       /* Always favor the highest oversampling rate */
> > +       for (i = (ARRAY_SIZE(sun4i_i2s_oversample_rates) - 1); i >= 0; i--) {
> > +               unsigned int oversample_rate = sun4i_i2s_oversample_rates[i];
> > +
> > +               bclk_div = sun4i_i2s_get_bclk_div(i2s, oversample_rate,
> > +                                                 word_size);
> > +               mclk_div = sun4i_i2s_get_mclk_div(i2s, oversample_rate,
> > +                                                 clk_rate,
> > +                                                 rate);
> > +
> > +               if ((bclk_div >= 0) && (mclk_div >= 0))
> > +                       break;
> > +       }
> > +
> > +       if (bclk_div < 0 && mclk_div < 0)
>
> this wouldn't work if one of the divs returns a valid value and I saw
> this when working with this driver. Use if ((bclk_div < 0) ||
> (mclk_div < 0)). Rest of the code looks code and I will have a go at
> testing with it ASAP,

Ack, thanks!
Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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