tree 5d7cde7708fc7e0c1dbcd69e52392840cf110e07
parent 9276babd9d734be6b3aa95a24b834f4e88366dc1
author Takashi Iwai <tiwai@suse.de> 1586766032 +0200
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1588433155 +0200

ALSA: hda: Keep the controller initialization even if no codecs found

[ Upstream commit 9479e75fca370a5220784f7596bf598c4dad0b9b ]

Currently, when the HD-audio controller driver doesn't detect any
codecs, it tries to abort the probe.  But this abort happens at the
delayed probe, i.e. the primary probe call already returned success,
hence the driver is never unbound until user does so explicitly.
As a result, it may leave the HD-audio device in the running state
without the runtime PM.  More badly, if the device is a HD-audio bus
that is tied with a GPU, GPU cannot reach to the full power down and
consumes unnecessarily much power.

This patch changes the logic after no-codec situation; it continues
probing without the further codec initialization but keep the
controller driver running normally.

BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=207043
Tested-by: Roy Spliet <nouveau@spliet.org>
Link: https://lore.kernel.org/r/20200413082034.25166-5-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>