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ALSA: hda: cs35l41: Assert reset before system suspend

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Some system suspend modes may remove power supplies.
To ensure we are not running during this time, we should assert reset.

Note: since the amps use a shared reset, asserting reset prior to
system suspend only works if the amps are suspended in the reverse
order to probe.

Signed-off-by: Stefan Binding <sbinding@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20231026150558.2105827-3-sbinding@opensource.cirrus.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Stefan Binding 2023-10-26 16:05:52 +01:00 committed by Takashi Iwai
parent f01b371b07
commit a7423e9019
1 changed files with 8 additions and 5 deletions
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13
sound/pci/hda/cs35l41_hda.c
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@ -813,14 +813,17 @@ static int cs35l41_system_suspend(struct device *dev)
/* Shutdown DSP before system suspend */
ret = cs35l41_ready_for_reset(cs35l41);
if (ret)
dev_err(dev, "System Suspend Failed, not ready for Reset: %d\n", ret);
/*
* Reset GPIO may be shared, so cannot reset here.
* However beyond this point, amps may be powered down.
*/
if (cs35l41->reset_gpio) {
dev_info(cs35l41->dev, "Asserting Reset\n");
gpiod_set_value_cansleep(cs35l41->reset_gpio, 0);
usleep_range(2000, 2100);
}
dev_dbg(cs35l41->dev, "System Suspended\n");
return ret;
}