topic Re: sgtl5000 problem on i.mx28 in i.MX Processors

sgtl5000 problem on i.mx28

snan1z — Sat, 29 Oct 2011 11:47:36 GMT

Hi all,

We have a problem about sgtl5000 on i.mx28 evk.

We play any mp3 file with mp3play app.

After a few seconds we kill mp3play with "Ctrl + c" and get below output,

sgtl5000_hw_read: read reg error : Reg 0x0e

sgtl5000_write: write reg error : Reg 0x0e = 0x000c

sgtl5000_write: write reg error : Reg 0x02 = 0x0020

sgtl5000_write: write reg error : Reg 0x06 = 0x0130

After 10-20 plays, sound gets interrupted and got more errors like below,

sgtl5000_write: write reg error : Reg 0x02 = 0x0021

sgtl5000_hw_read: read reg error : Reg 0x0e

sgtl5000_write: write reg error : Reg 0x0e = 0x0000

sgtl5000_write: write reg error : Reg 0x02 = 0x0021

sgtl5000_hw_read: read reg error : Reg 0x0e

sgtl5000_write: write reg error : Reg 0x0e = 0x0000

sgtl5000_hw_read: read reg error : Reg 0x0e

sgtl5000_write: write reg error : Reg 0x0e = 0x000c

sgtl5000_write: write reg error : Reg 0x02 = 0x0020

sgtl5000_write: write reg error : Reg 0x06 = 0x0130
sgtl5000_write: write reg error : Reg 0x2a = 0x0000

sgtl5000_write: write reg error : Reg 0x30 = 0x5a79

sgtl5000_write: write reg error : Reg 0x02 = 0x0020

sgtl5000_write: write reg error : Reg 0x24 = 0x0132

sgtl5000_hw_read: read reg error : Reg 0x0e

sgtl5000_write: write reg error : Reg 0x0e = 0x000c

sgtl5000_write: write reg error : Reg 0x30 = 0x5a60

sgtl5000_write: write reg error : Reg 0x02 = 0x0000

I can get sound after reboot.

Thanks

Re: sgtl5000 problem on i.mx28

snan1z — Mon, 31 Oct 2011 13:30:33 GMT

I wrote an test application for /dev/dsp. it plays a wav file in an infinite loop,after a while it gives error in ioctl function that is called after playback(shown below)

ioctl(fd, SOUND_PCM_SYNC, 0);

perror says "Input/output error"

Regards,

snan

Re: sgtl5000 problem on i.mx28

JerryFan — Wed, 02 Nov 2011 05:22:48 GMT

My guess is that the sclk of sgtl5000 is provided or controlled by the imx25, when the mp3play be killed, the sclk was be disable, and then all the access to sgtl5000 by i2c bus will fail.

I just wonder why sgtl5000 was be accessed even the mp3play be killed.

Re: sgtl5000 problem on i.mx28

CraigMcQueen — Wed, 20 Mar 2013 22:19:17 GMT

I'm seeing these sorts of problems too. Has anyone found a fix?

Re: sgtl5000 problem on i.mx28

Yuri — Thu, 21 Mar 2013 01:59:38 GMT

Please try the recent i.MX28 BSP :

https://www.freescale.com/webapp/Download?colCode=L2.6.35_1.1.0_DEMO_IMAGE&appType=license&location=null

https://www.freescale.com/webapp/Download?colCode=L2.6.35_1.1.0_ER_SOURCE&appType=license&location=null

https://www.freescale.com/webapp/Download?colCode=L2.6.35_1.1.0_LINUX_DOCS&location=null

Re: sgtl5000 problem on i.mx28

CraigMcQueen — Thu, 09 May 2013 23:34:28 GMT

In our case, we found that the problem occurred when a user-space application was trying to talk to an I2C bus device that wasn't connected (an OLED display). If we stopped that application, or connected the OLED display, the problem went away. I'm guessing that this may have tied up the I2C bus with timeouts, interfering with the normal SGTL5000 operation.

Still, I would hope that the SGTL5000 driver (or I2C driver, or whatever) should be robust enough to still function okay in this scenario. I haven't yet tried the i.MX28 BSP patches, but plan to soon.