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

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Message-ID: <20231121154419.19435-1-rf@opensource.cirrus.com>
Date:   Tue, 21 Nov 2023 15:44:19 +0000
From:   Richard Fitzgerald <rf@...nsource.cirrus.com>
To:     <tiwai@...e.com>
CC:     <linux-sound@...r.kernel.org>, <alsa-devel@...a-project.org>,
        <linux-kernel@...r.kernel.org>, <patches@...nsource.cirrus.com>,
        "Richard Fitzgerald" <rf@...nsource.cirrus.com>
Subject: [PATCH] ALSA: hda: cs35l56: Enable low-power hibernation mode on SPI

SPI hibernation is now supported with the latest hibernation/wake
sequences in the shared ASoC code.

This has a functional dependency on two commits:

commit 3df761bdbc8b ("ASoC: cs35l56: Wake transactions need to be issued
twice")

commit a47cf4dac7dc ("ASoC: cs35l56: Change hibernate sequence to use
allow auto hibernate")

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: Richard Fitzgerald <rf@...nsource.cirrus.com>
---
 sound/pci/hda/cs35l56_hda_spi.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/sound/pci/hda/cs35l56_hda_spi.c b/sound/pci/hda/cs35l56_hda_spi.c
index 756aec342eab..27d7fbc56b4c 100644
--- a/sound/pci/hda/cs35l56_hda_spi.c
+++ b/sound/pci/hda/cs35l56_hda_spi.c
@@ -21,6 +21,10 @@ static int cs35l56_hda_spi_probe(struct spi_device *spi)
 		return -ENOMEM;
 
 	cs35l56->base.dev = &spi->dev;
+
+#ifdef CS35L56_WAKE_HOLD_TIME_US
+	cs35l56->base.can_hibernate = true;
+#endif
 	cs35l56->base.regmap = devm_regmap_init_spi(spi, &cs35l56_regmap_spi);
 	if (IS_ERR(cs35l56->base.regmap)) {
 		ret = PTR_ERR(cs35l56->base.regmap);
-- 
2.30.2