[PATCH 2/2] ALSA: hda/cs8409: Prevent pops and clicks during reboot

[Vitaly Rodionov]

From: Stefan Binding <sbinding at opensource.cirrus.com>

During reboot, when the CS42L42 powers down, pops and clicks
may occur due to the codec not being shutdown gracefully.
This can be fixed by going through the suspend sequence,
which shuts down the codec cleanly inside the reboot_notify
hook, which is called on reboot.

Signed-off-by: Stefan Binding <sbinding at opensource.cirrus.com>
Signed-off-by: Vitaly Rodionov <vitalyr at opensource.cirrus.com>
---
 sound/pci/hda/patch_cs8409.c | 56 ++++++++++++++++++++----------------
 1 file changed, 32 insertions(+), 24 deletions(-)

diff --git a/sound/pci/hda/patch_cs8409.c b/sound/pci/hda/patch_cs8409.c
index 9db16b6292f4..f51fc4a1545a 100644
--- a/sound/pci/hda/patch_cs8409.c
+++ b/sound/pci/hda/patch_cs8409.c
@@ -753,7 +753,6 @@ static void cs42l42_resume(struct sub_codec *cs42l42)
 	cs42l42_enable_jack_detect(cs42l42);
 }
 
-#ifdef CONFIG_PM
 static void cs42l42_suspend(struct sub_codec *cs42l42)
 {
 	struct hda_codec *codec = cs42l42->codec;
@@ -773,6 +772,9 @@ static void cs42l42_suspend(struct sub_codec *cs42l42)
 		{ 0x1101, 0xFF },
 	};
 
+	if (cs42l42->suspended)
+		return;
+
 	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,
@@ -790,7 +792,6 @@ static void cs42l42_suspend(struct sub_codec *cs42l42)
 	gpio_data &= ~cs42l42->reset_gpio;
 	snd_hda_codec_write(codec, CS8409_PIN_AFG, 0, AC_VERB_SET_GPIO_DATA, gpio_data);
 }
-#endif
 
 static void cs8409_free(struct hda_codec *codec)
 {
@@ -803,6 +804,33 @@ static void cs8409_free(struct hda_codec *codec)
 	snd_hda_gen_free(codec);
 }
 
+/* Manage PDREF, when transition to D3hot */
+static int cs8409_cs42l42_suspend(struct hda_codec *codec)
+{
+	struct cs8409_spec *spec = codec->spec;
+	int i;
+
+	cs8409_enable_ur(codec, 0);
+
+	for (i = 0; i < spec->num_scodecs; i++)
+		cs42l42_suspend(spec->scodecs[i]);
+
+	/* Cancel i2c clock disable timer, and disable clock if left enabled */
+	cancel_delayed_work_sync(&spec->i2c_clk_work);
+	cs8409_disable_i2c_clock(codec);
+
+	snd_hda_shutup_pins(codec);
+
+	return 0;
+}
+
+static void cs8409_reboot_notify(struct hda_codec *codec)
+{
+	cs8409_cs42l42_suspend(codec);
+	snd_hda_gen_reboot_notify(codec);
+	codec->patch_ops.free(codec);
+}
+
 /******************************************************************************
  *                   BULLSEYE / WARLOCK / CYBORG Specific Functions
  *                               CS8409/CS42L42
@@ -845,28 +873,6 @@ static void cs8409_cs42l42_jack_unsol_event(struct hda_codec *codec, unsigned in
 	}
 }
 
-#ifdef CONFIG_PM
-/* Manage PDREF, when transition to D3hot */
-static int cs8409_cs42l42_suspend(struct hda_codec *codec)
-{
-	struct cs8409_spec *spec = codec->spec;
-	int i;
-
-	cs8409_enable_ur(codec, 0);
-
-	for (i = 0; i < spec->num_scodecs; i++)
-		cs42l42_suspend(spec->scodecs[i]);
-
-	/* Cancel i2c clock disable timer, and disable clock if left enabled */
-	cancel_delayed_work_sync(&spec->i2c_clk_work);
-	cs8409_disable_i2c_clock(codec);
-
-	snd_hda_shutup_pins(codec);
-
-	return 0;
-}
-#endif
-
 /* Vendor specific HW configuration
  * PLL, ASP, I2C, SPI, GPIOs, DMIC etc...
  */
@@ -910,6 +916,7 @@ static const struct hda_codec_ops cs8409_cs42l42_patch_ops = {
 	.init = cs8409_init,
 	.free = cs8409_free,
 	.unsol_event = cs8409_cs42l42_jack_unsol_event,
+	.reboot_notify = cs8409_reboot_notify,
 #ifdef CONFIG_PM
 	.suspend = cs8409_cs42l42_suspend,
 #endif
@@ -1121,6 +1128,7 @@ static const struct hda_codec_ops cs8409_dolphin_patch_ops = {
 	.init = cs8409_init,
 	.free = cs8409_free,
 	.unsol_event = dolphin_jack_unsol_event,
+	.reboot_notify = cs8409_reboot_notify,
 #ifdef CONFIG_PM
 	.suspend = cs8409_cs42l42_suspend,
 #endif
-- 
2.25.1