linux-kernel - Re: [PATCH 1/9] drm: bridge/dw_hdmi-ahb-audio: add audio driver

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Message-ID: <20151006185429.GU21513@n2100.arm.linux.org.uk>
Date:	Tue, 6 Oct 2015 19:54:29 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Fabio Estevam <festevam@...il.com>
Cc:	linux-rockchip@...ts.infradead.org,
	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
	DRI mailing list <dri-devel@...ts.freedesktop.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Fabio Estevam <fabio.estevam@...escale.com>,
	Jaroslav Kysela <perex@...ex.cz>,
	Mark Brown <broonie@...nel.org>,
	Yakir Yang <ykk@...k-chips.com>,
	Andy Yan <andy.yan@...k-chips.com>
Subject: Re: [PATCH 1/9] drm: bridge/dw_hdmi-ahb-audio: add audio driver

On Tue, Oct 06, 2015 at 03:45:32PM -0300, Fabio Estevam wrote:
> On Tue, Oct 6, 2015 at 3:18 PM, Russell King - ARM Linux
> <linux@....linux.org.uk> wrote:
> 
> > Sorry, I've been out for most of the day.  There's no DT patches required.
> >
> > The dw_hdmi bridge driver creates its own platform device for the audio,
> > which should then bind to the dw_hdmi-ahb-audio driver using normal Linux
> > methods.
> >
> > I don't know what's wrong with your setup, for me, it just works:
> >
> > [    1.358829] dwhdmi-imx 120000.hdmi: Detected HDMI controller 0x13:0xa:0xa0:0xc1
> > [    1.377173] imx-drm display-subsystem: bound 120000.hdmi (ops dw_hdmi_imx_ops)
> > ...
> > [    2.851343] ALSA device list:
> > [    2.857364]   #0: DW-HDMI rev 0x0a, irq 21
> >
> > as it always has done for me.  There's nothing special about it.
> 
> Great, got it to probe now:
> 
> [    7.454760] ALSA device list:
> [    7.457764]   #0: DW-HDMI rev 0x0a, irq 19
> [    7.461990]   #1: wm8962-audio
> 
> There was a conflict and I resolved incorrectly here. Will try to play
> a wav file via aplay now.

Make sure you have the ALSA config file, as alsalib won't get on
with dw-hdmi only accepting 24-bit audio without this.  A copy is
attached.  It also tells ALSA how to deal with multi-channel audio
as well.

-- 
FTTC broadband for 0.8mile line: currently at 9.6Mbps down 400kbps up
according to speedtest.net.

View attachment "dw-hdmi-ahb-aud.conf" of type "text/plain" (3908 bytes)