linux-kernel - [PATCH 1/4] ASoC: cs35l56: Change hibernate sequence to use allow auto hibernate

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Message-ID: <20231006111039.101914-2-rf@opensource.cirrus.com>
Date:   Fri, 6 Oct 2023 12:10:36 +0100
From:   Richard Fitzgerald <rf@...nsource.cirrus.com>
To:     <broonie@...nel.org>
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 1/4] ASoC: cs35l56: Change hibernate sequence to use allow auto hibernate

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

If the hardware uses SPI_MOSI, I2C_SCL or I2C_SDA as the wake source
the bus activity of sending HIBERNATE_NOW will wake up the amps that
were already put into hibernate.

ALLOW_AUTO_HIBERNATE tells the firmware to hibernate itself after a
timeout of a few seconds, giving the driver instances time to send this
before any amps have gone into hibernate.

Signed-off-by: Simon Trimmer <simont@...nsource.cirrus.com>
Signed-off-by: Richard Fitzgerald <rf@...nsource.cirrus.com>
---
 sound/soc/codecs/cs35l56-shared.c | 15 +++++----------
 1 file changed, 5 insertions(+), 10 deletions(-)

diff --git a/sound/soc/codecs/cs35l56-shared.c b/sound/soc/codecs/cs35l56-shared.c
index 01b6fa97b36b..68dc93b82789 100644
--- a/sound/soc/codecs/cs35l56-shared.c
+++ b/sound/soc/codecs/cs35l56-shared.c
@@ -439,7 +439,7 @@ EXPORT_SYMBOL_NS_GPL(cs35l56_is_fw_reload_needed, SND_SOC_CS35L56_SHARED);
 
 static const struct reg_sequence cs35l56_hibernate_seq[] = {
 	/* This must be the last register access */
-	REG_SEQ0(CS35L56_DSP_VIRTUAL1_MBOX_1, CS35L56_MBOX_CMD_HIBERNATE_NOW),
+	REG_SEQ0(CS35L56_DSP_VIRTUAL1_MBOX_1, CS35L56_MBOX_CMD_ALLOW_AUTO_HIBERNATE),
 };
 
 static const struct reg_sequence cs35l56_hibernate_wake_seq[] = {
@@ -473,12 +473,6 @@ int cs35l56_runtime_suspend_common(struct cs35l56_base *cs35l56_base)
 		return 0;
 	}
 
-	/*
-	 * Enable auto-hibernate. If it is woken by some other wake source
-	 * it will automatically return to hibernate.
-	 */
-	cs35l56_mbox_send(cs35l56_base, CS35L56_MBOX_CMD_ALLOW_AUTO_HIBERNATE);
-
 	/*
 	 * Must enter cache-only first so there can't be any more register
 	 * accesses other than the controlled hibernate sequence below.
@@ -545,11 +539,12 @@ int cs35l56_runtime_resume_common(struct cs35l56_base *cs35l56_base, bool is_sou
 	return 0;
 
 err:
-	regmap_write(cs35l56_base->regmap, CS35L56_DSP_VIRTUAL1_MBOX_1,
-		     CS35L56_MBOX_CMD_HIBERNATE_NOW);
-
 	regcache_cache_only(cs35l56_base->regmap, true);
 
+	regmap_multi_reg_write_bypassed(cs35l56_base->regmap,
+					cs35l56_hibernate_seq,
+					ARRAY_SIZE(cs35l56_hibernate_seq));
+
 	return ret;
 }
 EXPORT_SYMBOL_NS_GPL(cs35l56_runtime_resume_common, SND_SOC_CS35L56_SHARED);
-- 
2.30.2