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. -- FTTC broadband for 0.8mile line: currently at 9.5Mbps down 400kbps up according to speedtest.net. -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
