linux-kernel - Re: [alsa-devel] [PATCH 0/9] dw-hdmi audio support

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Date:	Thu, 7 Jan 2016 09:21:43 +0100
From:	Jean-Michel Hautbois <jean-michel.hautbois@...-labs.com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Philipp Zabel <p.zabel@...gutronix.de>,
	Fabio Estevam <fabio.estevam@...escale.com>,
	"alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
	David Airlie <airlied@...ux.ie>,
	Jon Nettleton <jon.nettleton@...il.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	ML dri-devel <dri-devel@...ts.freedesktop.org>,
	linux-rockchip@...ts.infradead.org,
	Yakir Yang <ykk@...k-chips.com>,
	Andy Yan <andy.yan@...k-chips.com>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [alsa-devel] [PATCH 0/9] dw-hdmi audio support

Hi Russell,

2016-01-05 17:04 GMT+01:00 Russell King - ARM Linux <linux@....linux.org.uk>:
> On Tue, Jan 05, 2016 at 04:40:54PM +0100, Jean-Michel Hautbois wrote:
>> Hi Russell,
>>
>> 2015-08-27 10:42 GMT+02:00 Philipp Zabel <p.zabel@...gutronix.de>:
>> >
>> > Am Samstag, den 08.08.2015, 17:09 +0100 schrieb Russell King - ARM
>> > Linux:
>> > > Following on from the previous sub-series, this sub-series adds audio
>> > > support to dw-hdmi.
>> > >
>> > > The two different variants are now in this patch: AHB audio support
>> > > found on iMX6 platforms, and I2S support found on Rockchip patches.
>> > > Thanks to Yakir Yang for contributing the I2S support.
>> > >
>> > > I suspect that there is still some discussion to be had on this
>> > > series, though I would like to see it moving forward so that we can
>> > > get something merged.
>> >
>> > Tested-by: Philipp Zabel <p.zabel@...gutronix.de>
>> > on i.MX6 GK802 via HDMI connected to a TV (stereo only).
>> >
>> > except for the i2s patch, which is broken in this series.
>> >
>> > regards
>> > Philipp
>>
>>
>> What is the status of this series ?
>> I would like to use audio output in HDMI on my i.MX6 board, but I
>> don't know if you have some pending WIP on this ?
>
> The I2S part has been dropped.  The DesignWare HDMI block is configurable
> when it is synthesized - it can contain either the AHB audio interface or
> an I2S interface.  Freescale chose to synthesize it with the AHB audio
> interface, and this is what my patches are geared up to provide.
>
> On Rockchip devices, they chose to synthesize it with the I2S audio
> block, and so they need a different driver for it.  Yakir Yang has been
> working on that, but I've not seen anything recently.  After merging
> his I2S patch, I found some problems and decided with Yakir that the
> best thing to do was to drop it.
>
> So, the result is we support HDMI audio on iMX6.
>
> The changes were merged into mainline during the 4.4 merge window, so
> Linux 4.4 will support iMX6 HDMI audio.
>

Thank you for this detailed answer. I will rebase onto 4.4 then :).

JM
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