linux-kernel - [PATCH] ALSA: hda: cs35l56: Enable low-power hibernation mode on i2c

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Date:   Wed, 11 Oct 2023 17:33:55 +0100
From:   Richard Fitzgerald <rf@...nsource.cirrus.com>
To:     <tiwai@...e.com>
CC:     <alsa-devel@...a-project.org>, <linux-kernel@...r.kernel.org>,
        <patches@...nsource.cirrus.com>,
        Simon Trimmer <simont@...nsource.cirrus.com>,
        Richard Fitzgerald <rf@...nsource.cirrus.com>
Subject: [PATCH] ALSA: hda: cs35l56: Enable low-power hibernation mode on i2c

From: Simon Trimmer <simont@...nsource.cirrus.com>

This can now be re-enabled as the sequence to reliably wake the device
has been implemented in the shared ASoC code.

This has a functional dependency on commit 3df761bdbc8b
("ASoC: cs35l56: Wake transactions need to be issued twice")

To protect against this, enabling hibernation is conditional on
CS35L56_WAKE_HOLD_TIME_US being defined, which indicates that the new
hibernation sequences are available.

Signed-off-by: Simon Trimmer <simont@...nsource.cirrus.com>
Signed-off-by: Richard Fitzgerald <rf@...nsource.cirrus.com>
---
 sound/pci/hda/cs35l56_hda_i2c.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/sound/pci/hda/cs35l56_hda_i2c.c b/sound/pci/hda/cs35l56_hda_i2c.c
index 757a4d193e0f..a9ef6d86de83 100644
--- a/sound/pci/hda/cs35l56_hda_i2c.c
+++ b/sound/pci/hda/cs35l56_hda_i2c.c
@@ -21,6 +21,10 @@ static int cs35l56_hda_i2c_probe(struct i2c_client *clt)
 		return -ENOMEM;
 
 	cs35l56->base.dev = &clt->dev;
+
+#ifdef CS35L56_WAKE_HOLD_TIME_US
+	cs35l56->base.can_hibernate = true;
+#endif
 	cs35l56->base.regmap = devm_regmap_init_i2c(clt, &cs35l56_regmap_i2c);
 	if (IS_ERR(cs35l56->base.regmap)) {
 		ret = PTR_ERR(cs35l56->base.regmap);
-- 
2.30.2