linux-kernel - [PATCH v4 11/27] ALSA: hda/cs8409: Prevent I2C access during suspend time

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Date:   Wed, 11 Aug 2021 19:56:38 +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>,
        Lucas Tanure <tanureal@...nsource.cirrus.com>
Subject: [PATCH v4 11/27] ALSA: hda/cs8409: Prevent I2C access during suspend time

From: Lucas Tanure <tanureal@...nsource.cirrus.com>

Signed-off-by: Lucas Tanure <tanureal@...nsource.cirrus.com>
Signed-off-by: Vitaly Rodionov <vitalyr@...nsource.cirrus.com>
---

Changes in v2:
- No changes

Changes in v3:
- No changes

Changes in v4:
- No changes

 sound/pci/hda/patch_cs8409.c | 14 ++++++++++++++
 sound/pci/hda/patch_cs8409.h |  1 +
 2 files changed, 15 insertions(+)

diff --git a/sound/pci/hda/patch_cs8409.c b/sound/pci/hda/patch_cs8409.c
index 4ad832f5c4ba..0b13bcecd778 100644
--- a/sound/pci/hda/patch_cs8409.c
+++ b/sound/pci/hda/patch_cs8409.c
@@ -127,9 +127,13 @@ static int cs8409_i2c_wait_complete(struct hda_codec *codec)
 static int cs8409_i2c_read(struct hda_codec *codec, unsigned int i2c_address, unsigned int i2c_reg,
 			   unsigned int paged)
 {
+	struct cs8409_spec *spec = codec->spec;
 	unsigned int i2c_reg_data;
 	unsigned int read_data;
 
+	if (spec->cs42l42_suspended)
+		return -EPERM;
+
 	cs8409_enable_i2c_clock(codec, 1);
 	cs8409_vendor_coef_set(codec, CS8409_I2C_ADDR, i2c_address);
 
@@ -172,8 +176,12 @@ static int cs8409_i2c_read(struct hda_codec *codec, unsigned int i2c_address, un
 static int cs8409_i2c_write(struct hda_codec *codec, unsigned int i2c_address, unsigned int i2c_reg,
 			    unsigned int i2c_data, unsigned int paged)
 {
+	struct cs8409_spec *spec = codec->spec;
 	unsigned int i2c_reg_data;
 
+	if (spec->cs42l42_suspended)
+		return -EPERM;
+
 	cs8409_enable_i2c_clock(codec, 1);
 	cs8409_vendor_coef_set(codec, CS8409_I2C_ADDR, i2c_address);
 
@@ -371,6 +379,8 @@ static void cs8409_cs42l42_reset(struct hda_codec *codec)
 	/* wait ~10ms */
 	usleep_range(10000, 15000);
 
+	spec->cs42l42_suspended = 0;
+
 	mutex_lock(&spec->cs8409_i2c_mux);
 
 	/* Clear interrupts, by reading interrupt status registers */
@@ -594,6 +604,9 @@ static int cs8409_suspend(struct hda_codec *codec)
 	/* Power down CS42L42 ASP/EQ/MIX/HP */
 	cs8409_i2c_write(codec, CS42L42_I2C_ADDR, 0x1101, 0xfe, 1);
 	mutex_unlock(&spec->cs8409_i2c_mux);
+
+	spec->cs42l42_suspended = 1;
+
 	/* Assert CS42L42 RTS# line */
 	snd_hda_codec_write(codec, CS8409_PIN_AFG, 0, AC_VERB_SET_GPIO_DATA, 0);
 
@@ -759,6 +772,7 @@ void cs8409_cs42l42_fixups(struct hda_codec *codec, const struct hda_fixup *fix,
 
 		spec->cs42l42_hp_jack_in = 0;
 		spec->cs42l42_mic_jack_in = 0;
+		spec->cs42l42_suspended = 1;
 
 		/* Basic initial sequence for specific hw configuration */
 		snd_hda_sequence_write(codec, cs8409_cs42l42_init_verbs);
diff --git a/sound/pci/hda/patch_cs8409.h b/sound/pci/hda/patch_cs8409.h
index 1d3ce28415fa..0f2084b6ec8e 100644
--- a/sound/pci/hda/patch_cs8409.h
+++ b/sound/pci/hda/patch_cs8409.h
@@ -269,6 +269,7 @@ struct cs8409_spec {
 	unsigned int cs42l42_hp_jack_in:1;
 	unsigned int cs42l42_mic_jack_in:1;
 	unsigned int cs42l42_volume_init:1;
+	unsigned int cs42l42_suspended:1;
 	char cs42l42_hp_volume[CS42L42_HP_CH];
 	char cs42l42_hs_mic_volume[CS42L42_HS_MIC_CH];
 
-- 
2.25.1