linux-kernel - [PATCH 4.4 2/9] ALSA: hda/realtek - Fix overridden device-specific initialization

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Date:   Fri, 13 Sep 2019 14:06:52 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Takashi Iwai <tiwai@...e.de>
Subject: [PATCH 4.4 2/9] ALSA: hda/realtek - Fix overridden device-specific initialization

From: Takashi Iwai <tiwai@...e.de>

commit 89781d0806c2c4f29072d3f00cb2dd4274aabc3d upstream.

The recent change to shuffle the codec initialization procedure for
Realtek via commit 607ca3bd220f ("ALSA: hda/realtek - EAPD turn on
later") caused the silent output on some machines.  This change was
supposed to be safe, but it isn't actually; some devices have quirk
setups to override the EAPD via COEF or BTL in the additional verb
table, which is applied at the beginning of snd_hda_gen_init().  And
this EAPD setup is again overridden in alc_auto_init_amp().

For recovering from the regression, tell snd_hda_gen_init() not to
apply the verbs there by a new flag, then apply the verbs in
alc_init().

BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=204727
Fixes: 607ca3bd220f ("ALSA: hda/realtek - EAPD turn on later")
Cc: <stable@...r.kernel.org>
Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 sound/pci/hda/hda_generic.c   |    3 ++-
 sound/pci/hda/hda_generic.h   |    1 +
 sound/pci/hda/patch_realtek.c |    2 ++
 3 files changed, 5 insertions(+), 1 deletion(-)

--- a/sound/pci/hda/hda_generic.c
+++ b/sound/pci/hda/hda_generic.c
@@ -5826,7 +5826,8 @@ int snd_hda_gen_init(struct hda_codec *c
 	if (spec->init_hook)
 		spec->init_hook(codec);
 
-	snd_hda_apply_verbs(codec);
+	if (!spec->skip_verbs)
+		snd_hda_apply_verbs(codec);
 
 	init_multi_out(codec);
 	init_extra_out(codec);
--- a/sound/pci/hda/hda_generic.h
+++ b/sound/pci/hda/hda_generic.h
@@ -236,6 +236,7 @@ struct hda_gen_spec {
 	unsigned int indep_hp_enabled:1; /* independent HP enabled */
 	unsigned int have_aamix_ctl:1;
 	unsigned int hp_mic_jack_modes:1;
+	unsigned int skip_verbs:1; /* don't apply verbs at snd_hda_gen_init() */
 
 	/* additional mute flags (only effective with auto_mute_via_amp=1) */
 	u64 mute_bits;
--- a/sound/pci/hda/patch_realtek.c
+++ b/sound/pci/hda/patch_realtek.c
@@ -772,9 +772,11 @@ static int alc_init(struct hda_codec *co
 	if (spec->init_hook)
 		spec->init_hook(codec);
 
+	spec->gen.skip_verbs = 1; /* applied in below */
 	snd_hda_gen_init(codec);
 	alc_fix_pll(codec);
 	alc_auto_init_amp(codec, spec->init_amp);
+	snd_hda_apply_verbs(codec); /* apply verbs here after own init */
 
 	snd_hda_apply_fixup(codec, HDA_FIXUP_ACT_INIT);