[alsa-devel] [PATCHv4 7/7] ASoC: TWL6030: Detect power-up sequence completion

[Mark Brown]

On Fri, Feb 26, 2010 at 06:22:34PM -0600, Olaya, Margarita wrote:

> Do you mean something like this?
> time_left = wait_for_completion_timeout(&priv->ready,
>                                         msecs_to_jiffies(48));
> if(!time_left) {
> 	twl_i2c_read_u8(TWL4030_MODULE_AUDIO_VOICE, &intid,
>                                         TWL6040_REG_INTID);
>       if (!(intid & TWL6040_READYINT))
> 		goto error;
> }
> 
> 	return 0;
> 
> error:
> 	dev_err(codec->dev, "timeout waiting for READYINT\n");
> 	return -ETIMEDOUT;

Yes, or wrapped in a for loop with shorter timeouts on the individual
waits.

> but in this case will it not take unnecessarily 48ms when the
> interruption line is not valid?

You're always going to get some additional delay when polling unless you
busy wait for completion, which obviously has its own problems.