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

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Date:	Mon, 15 Dec 2014 19:52:06 +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:

      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.


Best Regards.
> 在 2014年12月15日 18:38, Russell King - ARM Linux 写道:
>> On Mon, Dec 15, 2014 at 10:11:28AM +0800, Yakir Yang wrote:
>>> rk3288 use Designware HDMI IP, Designware HDMI supports four interfaces to
>>> config hdmi audio(I2S, S/PDIF, Generic Parallel Audio, AHB Audio DMA), but
>>> rk3288 only support two ways to config hdmi audio(I2S, S/PDIF), So we take
>>> I2S as hdmi audio operation interfaces, and then treat hdmi audio as an
>>> standard ALSA devices(only got platback function).
>> There is no need for dw-hdmi audio to be implemented as an ASoC
>> device - as I've already sent patches to Andy with my ALSA driver
>> which has been around for the last two years, and works well, and
>> doesn't require any additional DT description.
>>
>


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