linux-kernel - Re: [RFC PATCH 0/6] Those patches is used for dw

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Date:	Mon, 15 Dec 2014 20:46:22 +0800
From:	"Kuankuan.Yang" <ykk@...k-chips.com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
CC:	Philipp Zabel <p.zabel@...gutronix.de>, Zubair.Kakakhel@...tec.com,
	Fabio Estevam <fabio.estevam@...escale.com>,
	Shawn Guo <shawn.guo@...aro.org>,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	Heiko Stuebner <heiko@...ech.de>,
	Daniel Kurtz <djkurtz@...omium.org>,
	Sonny Rao <sonnyrao@...omium.org>,
	Dylan Reid <dgreid@...omium.org>,
	Xu Jianqun <jay.xu@...k-chips.com>,
	Stéphane Marchesin <marcheu@...omium.org>,
	Lars-Peter Clausen <lars@...afoo.de>,
	Brian Austin <brian.austin@...rus.com>,
	Bard Liao <bardliao@...ltek.com>,
	Max Filippov <jcmvbkbc@...il.com>,
	Oder Chiou <oder_chiou@...ltek.com>,
	Arnd Bergmann <arnd@...db.de>,
	Kumar Gala <galak@...eaurora.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Rob Herring <robh+dt@...nel.org>,
	David Airlie <airlied@...ux.ie>, Sean Cross <xobs@...agi.com>,
	Grant Likely <grant.likely@...aro.org>,
	linux-rockchip@...ts.infradead.org,
	Pawel Moll <pawel.moll@....com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Ben Zhang <benzh@...omium.org>, devicetree@...r.kernel.org,
	Liam Girdwood <lgirdwood@...il.com>,
	linux-arm-kernel@...ts.infradead.org,
	Jaroslav Kysela <perex@...ex.cz>,
	Mark Brown <broonie@...nel.org>, Takashi Iwai <tiwai@...e.de>,
	Mark Rutland <mark.rutland@....com>, Jyri Sarha <jsarha@...com>
Subject: Re: [RFC PATCH 0/6] Those patches is used for dw_hdmi audio.

Hi Russell:

I got an idea that we can split the pcm dma part code out, after that we 
can chose the buffer transmit way (AUD_DMA or I2S).
In that way i will make another i2s driver to transmit those buffer, but 
in the mainline kernel already lanched an rockchip i2s driver
(rockchip_i2s.c), so seams it maybe not an good way.

what's your opinion, russell?

Best Regards.

在 2014年12月15日 20:00, Russell King - ARM Linux 写道:
> On Mon, Dec 15, 2014 at 07:52:06PM +0800, Kuankuan.Yang wrote:
>>   Hi Russell:
>>
>>       thks for your replay, actually you also have send me those
>> dw-hdmi-audio.c patches, and I also agree it's an beautiful way to make
>> hdmi-audio works. Beside,
>>   I try to reuse it into our platform, and actually the system have created
>> the DW_HDMI sound card successfully, but i cannot play any sound  with this
>> sound card.
>>       After dump the registers, I found the part of "Audio DMA Registers"
>> cannot write and always read with 0x00.  So I searching the document
>> "Designware Core
>>   HDMI Transmitter Controller Databook", and found that  "Audio DMA
>> Registers" only present when the hardware configuration parameter AUDIO_IF
>> is set to
>>   AHBAUDDMA. Than I communicate with our IC colleagues, they told me that our
>> cpu rk3288 only support two way to  transmit audio data( I2S & SPDIF ), in
>> that
>> way we do not support AHB_DMA, it's very sad, and this it why i give up this
>> way, also it's my bad that i should replay to u first in the before mail.
> Okay, that means there is some work to be done to figure out how to
> support this correctly so that both the iMX and Rockchip code can
> co-exist together in the mainline kernel - that means we _both_ need
> to work together on this problem _before_ this code gets merged, so
> that we have a common approach between the two code bases.
>
> I really don't want to end up in another cocked up situation like
> what happened with the Dove audio, where it became politically
> impossible for the SolidRun platform to be properly supported by
> mainline kernels.
>


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