Re: [RFC PATCH 0/6] Those patches is used for dw_hdmi audio.

From: "Kuankuan.Yang" <ykk@rock-chips.com>
To: Russell King - ARM Linux <linux@arm.linux.org.uk>
Cc: "Mark Rutland" <mark.rutland@arm.com>,
	alsa-devel@alsa-project.org, "Heiko Stuebner" <heiko@sntech.de>,
	devicetree@vger.kernel.org, "David Airlie" <airlied@linux.ie>,
	dri-devel@lists.freedesktop.org,
	"Liam Girdwood" <lgirdwood@gmail.com>,
	"Max Filippov" <jcmvbkbc@gmail.com>,
	"Bard Liao" <bardliao@realtek.com>,
	"Lars-Peter Clausen" <lars@metafoo.de>,
	"Pawel Moll" <pawel.moll@arm.com>, "Takashi Iwai" <tiwai@suse.de>,
	linux-rockchip@lists.infradead.org,
	"Grant Likely" <grant.likely@linaro.org>,
	"Dylan Reid" <dgreid@chromium.org>,
	"Xu Jianqun" <jay.xu@rock-chips.com>,
	"Oder Chiou" <oder_chiou@realtek.com>,
	Zubair.Kakakhel@imgtec.com, "Arnd Bergmann" <arnd@arndb.de>,
	"Ian Campbell" <ijc+devicetree@hellion.org.uk>,
	"Jyri Sarha" <jsarha@ti.com>, "Ben Zhang" <benzh@chromium.org>,
	"Rob Herring" <robh+dt@kernel.org>,
	"Daniel Kurtz" <djkurtz@chromium.org>,
	"Stéphane Marchesin" <marcheu@chromium.org>
Subject: Re: [RFC PATCH 0/6] Those patches is used for dw_hdmi audio.
Date: Mon, 15 Dec 2014 19:45:37 +0800	[thread overview]
Message-ID: <548EC9E1.5040206@rock-chips.com> (raw)
In-Reply-To: <20141215103830.GD11285@n2100.arm.linux.org.uk>

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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