linux-kernel - [PATCH 26/27] ALSA: hda/cs8409: Follow correct CS42L42 power down sequence for suspend

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Date:   Mon, 26 Jul 2021 18:46:39 +0100
From:   Vitaly Rodionov <vitalyr@...nsource.cirrus.com>
To:     Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com>
CC:     <alsa-devel@...a-project.org>, <patches@...nsource.cirrus.com>,
        <linux-kernel@...r.kernel.org>,
        Stefan Binding <sbinding@...nsource.cirrus.com>
Subject: [PATCH 26/27] ALSA: hda/cs8409: Follow correct CS42L42 power down sequence for suspend

From: Stefan Binding <sbinding@...nsource.cirrus.com>

Signed-off-by: Stefan Binding <sbinding@...nsource.cirrus.com>
Signed-off-by: Vitaly Rodionov <vitalyr@...nsource.cirrus.com>
---
 sound/pci/hda/patch_cs8409.c | 23 ++++++++++++++++++++++-
 sound/pci/hda/patch_cs8409.h |  2 ++
 2 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/sound/pci/hda/patch_cs8409.c b/sound/pci/hda/patch_cs8409.c
index 54780b008547..64e3e0884e28 100644
--- a/sound/pci/hda/patch_cs8409.c
+++ b/sound/pci/hda/patch_cs8409.c
@@ -11,6 +11,7 @@
 #include <linux/module.h>
 #include <sound/core.h>
 #include <linux/mutex.h>
+#include <linux/iopoll.h>
 
 #include "patch_cs8409.h"
 
@@ -195,6 +196,7 @@ static int cs8409_i2c_read(struct sub_codec *scodec, unsigned int addr)
 	read_data = cs8409_vendor_coef_get(codec, CS8409_I2C_QREAD);
 
 	mutex_unlock(&spec->i2c_mux);
+
 	return read_data & 0x0ff;
 
 error:
@@ -651,9 +653,28 @@ static void cs42l42_suspend(struct sub_codec *cs42l42)
 {
 	struct hda_codec *codec = cs42l42->codec;
 	unsigned int gpio_data;
+	int reg_cdc_status = 0;
+	const struct cs8409_i2c_param cs42l42_pwr_down_seq[] = {
+		{ 0x2301, 0x3F },
+		{ 0x2302, 0x3F },
+		{ 0x2303, 0x3F },
+		{ 0x2001, 0x0F },
+		{ 0x2A01, 0x00 },
+		{ 0x1207, 0x00 },
+		{ 0x1101, 0xFE },
+		{ 0x1102, 0x8C },
+		{ 0x1101, 0xFF },
+	};
+
+	cs8409_i2c_bulk_write(cs42l42, cs42l42_pwr_down_seq, ARRAY_SIZE(cs42l42_pwr_down_seq));
+
+	if (read_poll_timeout(cs8409_i2c_read, reg_cdc_status,
+			(reg_cdc_status & 0x1), CS42L42_PDN_SLEEP_US, CS42L42_PDN_TIMEOUT_US,
+			true, cs42l42, 0x1308) < 0)
+		codec_warn(codec, "Timeout waiting for PDN_DONE for CS42L42\n");
 
 	/* Power down CS42L42 ASP/EQ/MIX/HP */
-	cs8409_i2c_write(cs42l42, 0x1101, 0xfe);
+	cs8409_i2c_write(cs42l42, 0x1102, 0x9C);
 	cs42l42->suspended = 1;
 	cs42l42->last_page = 0;
 
diff --git a/sound/pci/hda/patch_cs8409.h b/sound/pci/hda/patch_cs8409.h
index 71dbbd8e2f3b..09987daa9cbf 100644
--- a/sound/pci/hda/patch_cs8409.h
+++ b/sound/pci/hda/patch_cs8409.h
@@ -233,6 +233,8 @@ enum cs8409_coefficient_index_registers {
 #define CS42L42_JACK_REMOVED			(0x00)
 #define CS42L42_I2C_TIMEOUT_US			(20000)
 #define CS42L42_I2C_SLEEP_US			(2000)
+#define CS42L42_PDN_TIMEOUT_US			(250000)
+#define CS42L42_PDN_SLEEP_US			(2000)
 
 /* Dell BULLSEYE / WARLOCK / CYBORG Specific Definitions */
 
-- 
2.25.1