Comment 5 for bug 1950540

commit 517b391e25d489c20b5a78f4daac0dbb8bcaea99
Author: Kai Vehmanen <email address hidden>
AuthorDate: Fri Nov 5 13:16:55 2021 +0200
Commit: Andrea Righi <email address hidden>
CommitDate: Tue Jan 4 09:48:59 2022 +0100

    ASoC: SOF: Intel: hda: fix hotplug when only codec is suspended

    BugLink: https://bugs.launchpad.net/bugs/1953370

    [ Upstream commit fd572393baf0350835e8d822db588f679dc7bcb8 ]

    If codec is in runtime suspend, but controller is not, hotplug events
    are missed as the codec has no way to alert the controller. Problem does
    not occur if both controller and codec are active, or when both are
    suspended.

    An easy way to reproduce is to play an audio stream on one codec (e.g.
    to HDMI/DP display codec), wait for other HDA codec to go to runtime
    suspend, and then plug in a headset to the suspended codec. The jack
    event is not reported correctly in this case. Another way to reproduce
    is to force controller to stay active with
    "snd_sof_pci.sof_pci_debug=0x1"

    Fix the issue by reconfiguring the WAKEEN register when powering up/down
    individual links, and handling control events in the interrupt handler.

    Fixes: 87fc20e4a0cb ("ASoC: SOF: Intel: hda: use hdac_ext fine-grained link management")
    Reported-by: Hui Wang <email address hidden>
    Signed-off-by: Kai Vehmanen <email address hidden>
    Reviewed-by: Pierre-Louis Bossart <email address hidden>
    Reviewed-by: Ranjani Sridharan <email address hidden>
    Reviewed-by: Péter Ujfalusi <email address hidden>
    Link: https://<email address hidden>
    Signed-off-by: Mark Brown <email address hidden>
    Signed-off-by: Sasha Levin <email address hidden>
    Signed-off-by: Andrea Righi <email address hidden>