linux-kernel - [PATCH 3.16 078/132] ALSA: hda/hdmi - Read the pin sense from register when repolling

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Message-ID: <lsq.1568989415.522114580@decadent.org.uk>
Date:   Fri, 20 Sep 2019 15:23:35 +0100
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, Denis Kirjanov <kda@...ux-powerpc.org>,
        "Hui Wang" <hui.wang@...onical.com>, "Takashi Iwai" <tiwai@...e.de>
Subject: [PATCH 3.16 078/132] ALSA: hda/hdmi - Read the pin sense from
 register when repolling

3.16.74-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Hui Wang <hui.wang@...onical.com>

commit 8c2e6728c2bf95765b724e07d0278ae97cd1ee0d upstream.

The driver will check the monitor presence when resuming from suspend,
starting poll or interrupt triggers. In these 3 situations, the
jack_dirty will be set to 1 first, then the hda_jack.c reads the
pin_sense from register, after reading the register, the jack_dirty
will be set to 0. But hdmi_repoll_work() is enabled in these 3
situations, It will read the pin_sense a couple of times subsequently,
since the jack_dirty is 0 now, It does not read the register anymore,
instead it uses the shadow pin_sense which is read at the first time.

It is meaningless to check the shadow pin_sense a couple of times,
we need to read the register to check the real plugging state, so
we set the jack_dirty to 1 in the hdmi_repoll_work().

Signed-off-by: Hui Wang <hui.wang@...onical.com>
Signed-off-by: Takashi Iwai <tiwai@...e.de>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
--- a/sound/pci/hda/patch_hdmi.c
+++ b/sound/pci/hda/patch_hdmi.c
@@ -1632,6 +1632,12 @@ static void hdmi_repoll_eld(struct work_
 {
 	struct hdmi_spec_per_pin *per_pin =
 	container_of(to_delayed_work(work), struct hdmi_spec_per_pin, work);
+	struct hda_codec *codec = per_pin->codec;
+	struct hda_jack_tbl *jack;
+
+	jack = snd_hda_jack_tbl_get(codec, per_pin->pin_nid);
+	if (jack)
+		jack->jack_dirty = 1;

 	if (per_pin->repoll_count++ > 6)
 		per_pin->repoll_count = 0;