[alsa-devel] SGTL5000 startup error on reboot

[Erik Friesen]

I find that the codec is getting a write failure at sgtl5000_fill_defaults at

{ SGTL5000_CHIP_ANA_POWER, 0x7060 },

about half the time following a software reboot, and with external
vddd powered with 1.8v.  Reading this register shows that it is
already at 0x7060, so I am not sure what is up with that, but I would
suspect a hardware bug in the codec.

Using this code has fixed this so far.

static int sgtl5000_fill_defaults(struct sgtl5000_priv *sgtl5000)
{
 int i, ret, val, index;
 int reg;
 for (i = 0; i < ARRAY_SIZE(sgtl5000_reg_defaults); i++) {
  val = sgtl5000_reg_defaults[i].def;
  index = sgtl5000_reg_defaults[i].reg;
  ret = regmap_read(sgtl5000->regmap, index, &reg);
  if (ret) {
   printk(KERN_WARNING "SGTL5000 probe read failed at %i\n", i);
  return ret;
  }
  if (reg != val) {
   ret = regmap_write(sgtl5000->regmap, index, val);
  }
  if (ret) {
   printk(KERN_WARNING "SGTL5000 probe write failed %x at %i index %i
@ %x\n", val, i, index,  reg);
   return ret;
  }
 }
 return 0;
}