audio max5556 problem: No soundcards found

[thouswave]

hello,everyone

  On my custom board, audio codec device is max5556, it is a audio DAC chip without control interface, it is connected to imx6q chip with I2S interface only.

  I use file sound/soc/codecs/wm8727.c as template because wm8727 is very similar to max5556. my source code is on attach file.

  My linux kernel version is 3.0.35.

  With log, I am sure probe function in max5556.c is called successfully, but ALSA can not found soundcard, anyone can help me?

Original Attachment has been moved to: max5556.c.txt.zip

Original Attachment has been moved to: board-mx6q_sabresd.c.txt.zip

[saurabh206]

Hi,

You need to write the platform driver for your chip.

kernel_imx\sound\soc\imx\

You need to configure ssi as master.

Thanks

Saurabh

[thouswave]

Thanks for your reply. I will refer WM8962 source code and try to write paltform driver.

About configure SSI as master, can you tell me in detail?

[saurabh206 · Accepted solution]

imx_hifi_hw_params( ) is important.

Dai format set to  SND_SOC_DAIFMT_CBS_CFS for SSI master mode.

[thouswave]

I have tried to use wm8962 source code as template, I have comment out all the I2C communication code, now the sound card can be found.

[   21.144501] ALSA device list:

[   21.147470]   #0: wm8962-audio

But new problem happened, the following error message has been printed out:

[  163.896499] !KEEP THE SAME CHANNEL NUMBER: 2!

[  163.896504] Failed to match hw params: -22

[  163.896508] asoc: machine hw_params failed

[  215.480326] POST_PMU: HPOUTL PGA event failed: -110

[  215.990313] POST_PMU: HPOUTR PGA event failed: -110

[  324.030318] wm8962 0-001a: DC servo timed out

[  369.930318] POST_PMU: HPOUTL PGA event failed: -110

[  370.440316] POST_PMU: HPOUTR PGA event failed: -110

[  478.480320] wm8962 0-001a: DC servo timed out

[  479.501460]

[  479.501462] !KEEP THE SAME CHANNEL NUMBER: 2!

[  479.507308] Failed to match hw params: -22

[  479.519904] asoc: machine hw_params failed

[  479.524254]

[  479.524256] !KEEP THE SAME CHANNEL NUMBER: 2!

[  479.530100] Failed to match hw params: -22

[  479.534717] asoc: machine hw_params failed

[  479.538946]

[  479.538948] !KEEP THE SAME CHANNEL NUMBER: 2!

[  479.544809] Failed to match hw params: -22

[  479.548906] asoc: machine hw_params failed

[  479.553120]

[  479.553122] !KEEP THE SAME CHANNEL NUMBER: 2!

[  479.558967] Failed to match hw params: -22

[  479.563074] asoc: machine hw_params failed

[  479.567344]

[  479.567346] !KEEP THE SAME CHANNEL NUMBER: 2!

[  479.573203] Failed to match hw params: -22

[  479.577300] asoc: machine hw_params failed

I am try to understand the sound source code, hope to solve the problem.

Do you have some example similar to my application, if yes, may be I can develop it more quickly?

The following is my schematic:

signal connection is listed as following:

I2S_SDATA_DAC        CSI0_D5 

I2S_SCLK_DAC          CSI0_D4

I2S_LRCLK_DAC        CSI0_D6

I2S_MCLK_DAC         GPIO_0

[saurabh206]

Hi

Its better you should add your custom sound card. It will be helpful latter.

Keep only minimal code, you don't need to configure "HPOUT" and other stuff.

Thanks

Saurabh