linux-kernel - Re: [PATCH v4 24/24] drm/i2c: tda998x: adjust the audio clock divider for S/PDIF

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Message-ID: <20140127201231.GY15937@n2100.arm.linux.org.uk>
Date:	Mon, 27 Jan 2014 20:12:31 +0000
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Jean-Francois Moine <moinejf@...e.fr>
Cc:	dri-devel@...ts.freedesktop.org, Dave Airlie <airlied@...il.com>,
	Rob Clark <robdclark@...il.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 24/24] drm/i2c: tda998x: adjust the audio clock
	divider for S/PDIF

On Sat, Jan 25, 2014 at 06:14:36PM +0100, Jean-Francois Moine wrote:
> According to some tests on the Cubox (Marvell Armada 510 + TDA19988),
> the S/PDIF input asks for a greater audio clock divider.
> 
> Signed-off-by: Jean-Francois Moine <moinejf@...e.fr>
> ---
>  drivers/gpu/drm/i2c/tda998x_drv.c | 10 +++++++---
>  1 file changed, 7 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i2c/tda998x_drv.c b/drivers/gpu/drm/i2c/tda998x_drv.c
> index b4827c0..e4dfcb4 100644
> --- a/drivers/gpu/drm/i2c/tda998x_drv.c
> +++ b/drivers/gpu/drm/i2c/tda998x_drv.c
> @@ -679,10 +679,14 @@ tda998x_configure_audio(struct tda998x_priv *priv,
>  	 * There is no detailed info in the datasheet, so we just
>  	 * assume 100MHz requires larger divider.
>  	 */
> +	adiv = AUDIO_DIV_SERCLK_8;
>  	if (mode->clock > 100000)
> -		adiv = AUDIO_DIV_SERCLK_16;
> -	else
> -		adiv = AUDIO_DIV_SERCLK_8;
> +		adiv++;			/* AUDIO_DIV_SERCLK_8 */
> +
> +	/* S/PDIF asks for a larger divider */
> +	if (p->audio_format == AFMT_SPDIF)
> +		adiv++;			/* AUDIO_DIV_SERCLK_16 or _32 */

I'm not sure these comments are quite right... You start off with
adiv at AUDIO_DIV_SERCLK_8, and then you increment it, but the
comment says it's AUDIO_DIV_SERCLK_8 ?  Shouldn't it become
AUDIO_DIV_SERCLK_16 ?

Please review the above change yourself. :)

-- 
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