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ASoC: Don't defer resume work for AC97 codecs

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AC97 devices may have other drivers hanging off them directly so need to
have resumed when the resume function returns meaning that we can't defer
the resume - complete it immediately for them. Non-AC97 devices should
not have other drivers hanging directly off the ASoC devices.

We only really need the deferral for non-AC97 devices - it's there since
some I2C buses are very slow and non-AC97 codecs often have large numbers
of registers to restore and require delays to bring the codec up cleanly
leading to a substantial impact on overall resume time.

Reported-by: Russell King <linux@arm.linux.org.uk>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
This commit is contained in:
Mark Brown 2009-03-31 11:27:03 +01:00
parent a7808331f1
commit 64ab9baa00
1 changed files with 14 additions and 4 deletions
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18
sound/soc/soc-core.c
View file

@ -767,11 +767,21 @@ static int soc_resume(struct platform_device *pdev)
{
struct snd_soc_device *socdev = platform_get_drvdata(pdev);
struct snd_soc_card *card = socdev->card;
struct snd_soc_dai *cpu_dai = card->dai_link[0].cpu_dai;
dev_dbg(socdev->dev, "scheduling resume work\n");
if (!schedule_work(&card->deferred_resume_work))
dev_err(socdev->dev, "resume work item may be lost\n");
/* AC97 devices might have other drivers hanging off them so
* need to resume immediately. Other drivers don't have that
* problem and may take a substantial amount of time to resume
* due to I/O costs and anti-pop so handle them out of line.
*/
if (cpu_dai->ac97_control) {
dev_dbg(socdev->dev, "Resuming AC97 immediately\n");
soc_resume_deferred(&card->deferred_resume_work);
} else {
dev_dbg(socdev->dev, "Scheduling resume work\n");
if (!schedule_work(&card->deferred_resume_work))
dev_err(socdev->dev, "resume work item may be lost\n");
}
return 0;
}