Messages in this thread Patch in this message | | | From | Stefan Binding <> | Subject | [PATCH v1 3/8] ALSA: hda: cs35l41: Assert Reset prior to de-asserting in probe and system resume | Date | Thu, 26 Oct 2023 16:05:53 +0100 |
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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> --- sound/pci/hda/cs35l41_hda.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/sound/pci/hda/cs35l41_hda.c b/sound/pci/hda/cs35l41_hda.c index 919e38213975..1ac721085fb5 100644 --- a/sound/pci/hda/cs35l41_hda.c +++ b/sound/pci/hda/cs35l41_hda.c @@ -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); } -- 2.34.1
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