tree a2c73e682853e3d3c527969da86cf4298c2e7981
parent 5286e2dfb08245dbdbf5475deed7edd707f18ee4
author Kai Vehmanen <kai.vehmanen@linux.intel.com> 1579536077 +0200
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1582529690 +0100

ALSA: hda/hdmi - add retry logic to parse_intel_hdmi()

[ Upstream commit 2928fa0a97ebb9549cb877fdc99aed9b95438c3a ]

The initial snd_hda_get_sub_node() can fail on certain
devices (e.g. some Chromebook models using Intel GLK).
The failure rate is very low, but as this is is part of
the probe process, end-user impact is high.

In observed cases, related hardware status registers have
expected values, but the node query still fails. Retrying
the node query does seem to help, so fix the problem by
adding retry logic to the query. This does not impact
non-Intel platforms.

BugLink: https://github.com/thesofproject/linux/issues/1642
Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Reviewed-by: Takashi Iwai <tiwai@suse.de>
Link: https://lore.kernel.org/r/20200120160117.29130-4-kai.vehmanen@linux.intel.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>