sgtl5000 cause system can't wakeup after suspend on Yocto 1.8

[charleshuang]

Hi

We use i.MX6 and sgtl5000 on fsl-yocto-3.14.52 , and we found a issue that sgtl5000 cause system can't wake up after suspend.

Please help  to solve this issue

Thanks

[art]

The issue you mention is not the known one. Why do you think that SGTL5000 causes the system to not wake up after suspend? Please describe in more details.

Have a great day,
Artur

[charleshuang]

Hi Artur

 Because when I  modiy code as below, it works fine

static int sgtl5000_resume(struct snd_soc_codec *codec)
{
        /* Bring the codec back up to standby to enable regulators */
        sgtl5000_set_bias_level(codec, SND_SOC_BIAS_STANDBY);

        /* Restore registers by cached in memory */
        //sgtl5000_restore_regs(codec);
        return 0;
}

[james_walmsley]

Hi Charles, 

I also have this problem. Removing the call to restore_regs() fixes the problem as you have suggested.

The system seems to operate correctly with this call removed, and I couldn't actually find where the regs are saved e.g. during suspend.

Did you find out further why this is happening?

I am using the 3.14.52 - lp5.1.1-2.0.0-ga kernel.

I will look in the newer kernels for changes in the code.

James