This is a note to let you know that I've just added the patch titled
ALSA: hda/cs8409: Set PMSG_ON earlier inside cs8409 driver
to the 5.15-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-cs8409-set-pmsg_on-earlier-inside-cs8409-driver.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 65cc4ad62a9ed47c0b4fcd7af667d97d7c29f19d Mon Sep 17 00:00:00 2001
From: Stefan Binding <sbinding@xxxxxxxxxxxxxxxxxxxxx>
Date: Sun, 28 Nov 2021 11:55:58 +0000
Subject: ALSA: hda/cs8409: Set PMSG_ON earlier inside cs8409 driver
From: Stefan Binding <sbinding@xxxxxxxxxxxxxxxxxxxxx>
commit 65cc4ad62a9ed47c0b4fcd7af667d97d7c29f19d upstream.
For cs8409, it is required to run Jack Detect on resume.
Jack Detect on cs8409+cs42l42 requires an interrupt from
cs42l42 to be sent to cs8409 which is propogated to the driver
via an unsolicited event.
However, the hda_codec drops unsolicited events if the power_state
is not set to PMSG_ON. Which is set at the end of the resume call.
This means there is a race condition between setting power_state
to PMSG_ON and receiving the interrupt.
To solve this, we can add an API to set the power_state earlier
and call that before we start Jack Detect.
This does not cause issues, since we know inside our driver that
we are already initialized, and ready to handle the unsolicited
events.
Signed-off-by: Stefan Binding <sbinding@xxxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Vitaly Rodionov <vitalyr@xxxxxxxxxxxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> # v5.15+
Link: https://lore.kernel.org/r/20211128115558.71683-1-vitalyr@xxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
sound/pci/hda/hda_local.h | 9 +++++++++
sound/pci/hda/patch_cs8409.c | 5 +++++
2 files changed, 14 insertions(+)
--- a/sound/pci/hda/hda_local.h
+++ b/sound/pci/hda/hda_local.h
@@ -438,6 +438,15 @@ int snd_hda_codec_set_pin_target(struct
#define for_each_hda_codec_node(nid, codec) \
for ((nid) = (codec)->core.start_nid; (nid) < (codec)->core.end_nid; (nid)++)
+/* Set the codec power_state flag to indicate to allow unsol event handling;
+ * see hda_codec_unsol_event() in hda_bind.c. Calling this might confuse the
+ * state tracking, so use with care.
+ */
+static inline void snd_hda_codec_allow_unsol_events(struct hda_codec *codec)
+{
+ codec->core.dev.power.power_state = PMSG_ON;
+}
+
/*
* get widget capabilities
*/
--- a/sound/pci/hda/patch_cs8409.c
+++ b/sound/pci/hda/patch_cs8409.c
@@ -750,6 +750,11 @@ static void cs42l42_resume(struct sub_co
if (cs42l42->full_scale_vol)
cs8409_i2c_write(cs42l42, 0x2001, 0x01);
+ /* we have to explicitly allow unsol event handling even during the
+ * resume phase so that the jack event is processed properly
+ */
+ snd_hda_codec_allow_unsol_events(cs42l42->codec);
+
cs42l42_enable_jack_detect(cs42l42);
}
Patches currently in stable-queue which might be from sbinding@xxxxxxxxxxxxxxxxxxxxx are
queue-5.15/alsa-hda-cs8409-set-pmsg_on-earlier-inside-cs8409-driver.patch
