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 thosedw-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.