linux-kernel - [PATCH 4.19 050/149] ALSA: hda/realtek - Apply ALC294 hp init also for S4 resume

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Message-Id: <20191104212139.627500139@linuxfoundation.org>
Date:   Mon,  4 Nov 2019 22:44:03 +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>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 050/149] ALSA: hda/realtek - Apply ALC294 hp init also for S4 resume

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

[ Upstream commit f6ef4e0e284251ff795c541db1129c84515ed044 ]

The init sequence for ALC294 headphone stuff is needed not only for
the boot up time but also for the resume from hibernation, where the
device is switched from the boot kernel without sound driver to the
suspended image.  Since we record the PM event in the device
power_state field, we can now recognize the call pattern and apply the
sequence conditionally.

Signed-off-by: Takashi Iwai <tiwai@...e.de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 sound/pci/hda/patch_realtek.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/sound/pci/hda/patch_realtek.c b/sound/pci/hda/patch_realtek.c
index dd46354270d0d..7480218f32ba7 100644
--- a/sound/pci/hda/patch_realtek.c
+++ b/sound/pci/hda/patch_realtek.c
@@ -3458,7 +3458,9 @@ static void alc294_init(struct hda_codec *codec)
 {
 	struct alc_spec *spec = codec->spec;
 
-	if (!spec->done_hp_init) {
+	/* required only at boot or S4 resume time */
+	if (!spec->done_hp_init ||
+	    codec->core.dev.power.power_state.event == PM_EVENT_RESTORE) {
 		alc294_hp_init(codec);
 		spec->done_hp_init = true;
 	}
-- 
2.20.1