[Alsa-user] WM8727 & AT91SAM9G45: DMA or IRQ trouble
Brought to you by:
perex
|
From: Ankur P. <con...@gm...> - 2011-08-16 06:49:15
|
Dear Friends, I am using WM8727 codec with AT91SAM9G45 processor. I have implemented machine code as http://pastebin.com/axadqGhd . I found over the web that the SSC driver from Atmel and WM8727 Codec driver works fine as couple of ppl have used it successfully. I guess the issue should be in the machine driver. After insterting the module I got following output: # insmod sam9g45_wm8727.ko atmel-pcm:preallocate_dma_buffer: area=ffadf000, addr=77c40000, size=32768 asoc: WM8727 <-> atmel-ssc0 mapping ok I am getting error while running "cat /dev/urandom > /dev/audio" and found following output : # cat /dev/urandom > /dev/audio atmel_ssc_startup: SSC_SR=0x204 atmel_ssc_hw_params: RCMR=00010721 RFMR=0000008f TCMR=00010702 TFMR=0000008f atmel_ssc_dai: Starting clock atmel_ssc_dai,hw_params: SSC initialized atmel-pcm: hw_params: DMA for SSC0 PCM out initialized (dma_bytes=32768, period_size=8192) transmit enabled SSC_SR=0x000104cf atmel-pcm:buffer_size = 8192,dma_area = ffac1000, dma_bytes = 32768 atmel-pcm: trigger: period_ptr=77962000, xpr=2006319104, xcr=4096, xnpr=2006327296, xncr=4096 sr=65731 imr=0 ALSA sound/core/pcm_lib.c:1708: playback write error (DMA or IRQ trouble?) ALSA sound/core/pcm_lib.c:1708: playback write error (DMA or IRQ trouble?) cat: write error: Input/output error ALSA sound/core/pcm_native.c:1482: playback drain error (DMA or IRQ trouble?) atmel-pcm:buffer_size = 8192,dma_area = ffac1000, dma_bytes = 32768 atmel_ssc_shutdown: transmit disabled SSC_SR=0x000000c0 atmel_ssc_dau: Stopping clock Any suggestions/thoughts will be helpful. Note: I have posted the question alsa-devel but later on I found that it is for the enhancement for the drivers so I am posting it on the alsa-user mailing list. Have a Good Day, Thank you, Ankur. |