[PATCH 4.17 17/42] ALSA: hda - Sleep for 10ms after entering D3 on Conexant codecs

From: Greg Kroah-Hartman
Date: Tue Aug 21 2018 - 02:24:32 EST

4.17-stable review patch. If anyone has any objections, please let me know.


From: Park Ju Hyung <qkrwngud825@xxxxxxxxx>

commit f59cf9a0551dd954ad8b752461cf19d9789f4b1d upstream.

On rare occasions, we are still noticing that the internal speaker
spitting out spurious noises even after adding the problematic codec
to the list.

Adding a 10ms artificial delay before rebooting fixes the issue entirely.

Patch for Realtek codecs also adds the same amount of delay after
entering D3.

Signed-off-by: Park Ju Hyung <qkrwngud825@xxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

sound/pci/hda/patch_conexant.c | 1 +
1 file changed, 1 insertion(+)

--- a/sound/pci/hda/patch_conexant.c
+++ b/sound/pci/hda/patch_conexant.c
@@ -225,6 +225,7 @@ static void cx_auto_reboot_notify(struct
snd_hda_codec_set_power_to_all(codec, codec->core.afg, AC_PWRST_D3);
snd_hda_codec_write(codec, codec->core.afg, 0,
+ msleep(10);

static void cx_auto_free(struct hda_codec *codec)