diff mbox series

[05/10,SRU,M] ALSA: hda: cs35l41: Assert Reset prior to de-asserting in probe and system resume

Message ID 20231122063541.11346-6-chris.chiu@canonical.com
State New
Headers show
Series Fix system suspend problem for Cirrus CS35L41 HDA codec on HP ZBook Fury 16 G9 | expand

Commit Message

Chris Chiu Nov. 22, 2023, 6:35 a.m. UTC 
From: Stefan Binding <sbinding@opensource.cirrus.com>

BugLink: https://bugs.launchpad.net/bugs/2042060

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>
(cherry picked from commit fff393db71c1d53a13f9eb2f8da77c1f5e4e30bc)
Signed-off-by: Chris Chiu <chris.chiu@canonical.com>
---
 sound/pci/hda/cs35l41_hda.c | 2 ++
 1 file changed, 2 insertions(+)
diff mbox series

Patch

diff --git a/sound/pci/hda/cs35l41_hda.c b/sound/pci/hda/cs35l41_hda.c
index 1eed99fbc41a..fadac1603a9a 100644
--- a/sound/pci/hda/cs35l41_hda.c
+++ b/sound/pci/hda/cs35l41_hda.c
@@ -775,6 +775,7 @@  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);
 	}
@@ -1537,6 +1538,7 @@  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);
 	}