Commit fff393db authored Oct 26, 2023 by Stefan Binding Committed by Takashi Iwai Oct 26, 2023

ALSA: hda: cs35l41: Assert Reset prior to de-asserting in probe and system resume

To ensure we are in a known state, exiting from reset at the point of
probe or in system resume, assert reset before we de-assert it.

Since the BIOS may enter into a pre-boot environment to control the
amps (for example for boot beep), we need to ensure we start from a
known, reset state prior to probe or system resume.

Signed-off-by: Stefan Binding <sbinding@opensource.cirrus.com>
Link: https://lore.kernel.org/r/20231026150558.2105827-4-sbinding@opensource.cirrus.com

Signed-off-by: Takashi Iwai <tiwai@suse.de>

parent a7423e90

sound/pci/hda/cs35l41_hda.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -840,6 +840,7 @@ static int cs35l41_system_resume(struct device *dev)
		}

		if (cs35l41->reset_gpio) {
		gpiod_set_value_cansleep(cs35l41->reset_gpio, 0);
		usleep_range(2000, 2100);
		gpiod_set_value_cansleep(cs35l41->reset_gpio, 1);
		}
		@@ -1693,6 +1694,7 @@ int cs35l41_hda_probe(struct device dev, const char device_name, int id, int i
		}
		}
		if (cs35l41->reset_gpio) {
		gpiod_set_value_cansleep(cs35l41->reset_gpio, 0);
		usleep_range(2000, 2100);
		gpiod_set_value_cansleep(cs35l41->reset_gpio, 1);
		}