linux-kernel - [PATCH] ALSA: hda: Enable runtime PM when codec probe fails

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Message-Id: <20201214060621.1102931-1-kai.heng.feng@canonical.com>
Date:   Mon, 14 Dec 2020 14:06:20 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     tiwai@...e.com
Cc:     Kai-Heng Feng <kai.heng.feng@...onical.com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Kai Vehmanen <kai.vehmanen@...ux.intel.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Guennadi Liakhovetski <guennadi.liakhovetski@...ux.intel.com>,
        Alex Deucher <alexander.deucher@....com>,
        Mike Rapoport <rppt@...nel.org>,
        alsa-devel@...a-project.org (moderated list:SOUND),
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH] ALSA: hda: Enable runtime PM when codec probe fails

When codec probe fails, it doesn't enable runtime suspend, and can
prevent graphics card from getting powered down:
[    4.280991] snd_hda_intel 0000:01:00.1: no codecs initialized

$ cat /sys/bus/pci/devices/0000:01:00.1/power/runtime_status
active

So enable runtime PM when codec probe fails, to let graphics card be
able to runtime suspend again.

Merge azx_probe_continue() into azx_probe() and just let probe fail for
this case could be a better approach. However that's a much bigger task
so let's settle with a quirk workaround.

BugLink: https://bugs.launchpad.net/bugs/1907212
Signed-off-by: Kai-Heng Feng <kai.heng.feng@...onical.com>
---
 sound/pci/hda/hda_intel.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index 6852668f1bcb..3fd920069268 100644
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -2328,7 +2328,7 @@ static int azx_probe_continue(struct azx *chip)
 	if (bus->codec_mask) {
 		err = azx_probe_codecs(chip, azx_max_codecs[chip->driver_type]);
 		if (err < 0)
-			goto out_free;
+			goto out_enable_rpm;
 	}
 
 #ifdef CONFIG_SND_HDA_PATCH_LOADER
@@ -2360,6 +2360,7 @@ static int azx_probe_continue(struct azx *chip)
 
 	set_default_power_save(chip);
 
+out_enable_rpm:
 	if (azx_has_pm_runtime(chip)) {
 		pm_runtime_use_autosuspend(&pci->dev);
 		pm_runtime_allow(&pci->dev);
-- 
2.29.2