On 13/11/14 23:32, Fabio Estevam wrote:
On Thu, Nov 13, 2014 at 4:34 AM, Craig McQueen craig.mcqueen@beamcommunications.com wrote:
I'm testing the 3.18 kernel for i.MX28 EVK, which has an SGTL5000 CODEC. I notice that audio cannot be output at 8 kHz or 11.025 kHz, although the SGTL5000 data sheet table 8 indicates this should be possible.
If I try to play or record at 8 kHz or 11.025 kHz, I get an error message:
# aplay test_8k.wav [ 6168.910201] mxs_evk_startup: Skipped programming wolfson codecIs this really a mainline kernel? I don't see any 'mxs_evk_startup' in mainline.
You're right, I cut-and-pasted that from my original work on a custom audio driver on a 3.14 kernel. Sorry about that. But still, I get the same error on the 3.18-rc4 kernel. Here is a sample:
# aplay -D hw:0,0 stereo_8k.wav Playing WAVE 'stereo_8k.wav' : Signed 16 bit Little Endian, Rate 8000 Hz, Stereo [ 3718.857813] sgtl5000 0-000a: Invalid mclk frequency: 4.096MHz [ 3718.865460] mxs-sgtl5000 sound: ASoC: machine hw_params failed: -22 aplay: set_params:1297: Unable to install hw params: ACCESS: RW_INTERLEAVED FORMAT: S16_LE SUBFORMAT: STD SAMPLE_BITS: 16 FRAME_BITS: 32 CHANNELS: 2 RATE: 8000 ...
Playing WAVE 'test_8k.wav' : Signed 16 bit Little Endian, Rate 8000 Hz,Mono [ 6168.941211] sgtl5000 0-000a: Invalid mclk frequency: 4.096MHz [ 6168.947047] mxs-sgtl5000 sound.11: ASoC: machine hw_params failed: -22 aplay: set_params:1145: Unable to install hw params: ...
For an 8 kHz sample rate, I get
Invalid mclk frequency: 4.096MHzI am not able to reproduce this bug here. I can play 8kHz file on the mx28evk:
root@freescale /home$ aplay mono_8k.wav Playing WAVE 'mono_8k.wav' : Unsigned 8 bit, Rate 8000 Hz, Mono
If you're playing a mono file successfully, then you must be going through an ALSA plugin that does some sort of rate/format/channel conversion. That depends on what's in asoundrc. Please try it with the -D hw:0,0 parameter and a stereo file.