Patch "ALSA: hda - Shutdown CX20722 on reboot/free to avoid spurious noises" has been added to the 4.1-stable tree

This is a note to let you know that I've just added the patch titled

ALSA: hda - Shutdown CX20722 on reboot/free to avoid spurious noises

to the 4.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
alsa-hda-shutdown-cx20722-on-reboot-free-to-avoid-spurious-noises.patch
and it can be found in the queue-4.1 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: David Henningsson <[email protected]>
Date: Fri, 21 Aug 2015 09:42:35 +0200
Subject: ALSA: hda - Shutdown CX20722 on reboot/free to avoid spurious noises

From: David Henningsson <[email protected]>

commit f6b28e4ded45bb91bc4cd115d55e35badedfce5f upstream.

On shutdown/reboot of CX20722, first shut down all EAPDs, then shut down the afg node to D3.

Failure to do so can lead to spurious noises from the internal speaker directly after reboot (and before the codec is reinitialized again, i e in BIOS setup or GRUB menus).

---
 sound/pci/hda/patch_conexant.c |   23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

@@ -200,12 +200,33 @@ static int cx_auto_init(struct hda_codec
 	return 0;
 }
 
-#define cx_auto_free	snd_hda_gen_free
+static void cx_auto_reboot_notify(struct hda_codec *codec)
+{
+	struct conexant_spec *spec = codec->spec;
+
+	if (codec->core.vendor_id != 0x14f150f2)
+		return;
+
+	/* Turn the CX20722 codec into D3 to avoid spurious noises
+	   from the internal speaker during (and after) reboot */
+	cx_auto_turn_eapd(codec, spec->num_eapds, spec->eapds, false);
+
+	snd_hda_codec_set_power_to_all(codec, codec->core.afg, AC_PWRST_D3);
+	snd_hda_codec_write(codec, codec->core.afg, 0,
+			    AC_VERB_SET_POWER_STATE, AC_PWRST_D3);
+}
+
+static void cx_auto_free(struct hda_codec *codec)
+{
+	cx_auto_reboot_notify(codec);
+	snd_hda_gen_free(codec);
+}
 
 static const struct hda_codec_ops cx_auto_patch_ops = {
 	.build_controls = cx_auto_build_controls,
 	.build_pcms = snd_hda_gen_build_pcms,
 	.init = cx_auto_init,
+	.reboot_notify = cx_auto_reboot_notify,
 	.free = cx_auto_free,
 	.unsol_event = snd_hda_jack_unsol_event,
 #ifdef CONFIG_PM

Patches currently in stable-queue which might be from [email protected] are

queue-4.1/alsa-hda-shutdown-cx20722-on-reboot-free-to-avoid-spurious-noises.patch