ALSA: hda: hdmi - preserve non-MST PCM routing for Intel platforms
BugLink: https://bugs.launchpad.net/bugs/1867704
Commit
5398e94fb753 ("ALSA: hda - Add DP-MST support for NVIDIA codecs")
introduced a slight change of behaviour how non-MST monitors are
assigned to PCMs on Intel platforms.
In the drm_audio_component.h interface, the third parameter
to pin_eld_notify() is pipe number. On Intel platforms, this value
is -1 for MST. On other platforms, a non-zero pipe id is used to
signal MST use.
This difference leads to some subtle differences in hdmi_find_pcm_slot()
with regards to how non-MST monitors are assigned to PCMs.
This patch restores the original behaviour on Intel platforms while
keeping the new allocation policy on other platforms.
Signed-off-by: Kai Vehmanen <kai.vehmanen@linux.intel.com>
Link: https://lore.kernel.org/r/20191129143756.23941-2-kai.vehmanen@linux.intel.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
(backported from commit
609f5485344b05a7eaffe9fdd09d42ad1c501cdf)
Signed-off-by: Hui Wang <hui.wang@canonical.com>
Acked-by: Stefan Bader <stefan.bader@canonical.com>
Acked-By: AceLan Kao <acelan.kao@canonical.com>
Signed-off-by: Kelsey Skunberg <kelsey.skunberg@canonical.com>