Commit ca76282b authored by Kai Vehmanen's avatar Kai Vehmanen Committed by Takashi Iwai

ALSA: hda/hdmi: fix race in monitor detection during probe

A race exists between build_pcms() and build_controls() phases of codec
setup. Build_pcms() sets up notifier for jack events. If a monitor event
is received before build_controls() is run, the initial jack state is
lost and never reported via mixer controls.

The problem can be hit at least with SOF as the controller driver. SOF
calls snd_hda_codec_build_controls() in its workqueue-based probe and
this can be delayed enough to hit the race condition.

Fix the issue by invalidating the per-pin ELD information when
build_controls() is called. The existing call to hdmi_present_sense()
will update the ELD contents. This ensures initial monitor state is
correctly reflected via mixer controls.

BugLink: https://github.com/thesofproject/linux/issues/1687Signed-off-by: default avatarKai Vehmanen <kai.vehmanen@linux.intel.com>
Link: https://lore.kernel.org/r/20200428123836.24512-1-kai.vehmanen@linux.intel.comSigned-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent ef0b3203
......@@ -2198,7 +2198,9 @@ static int generic_hdmi_build_controls(struct hda_codec *codec)
for (pin_idx = 0; pin_idx < spec->num_pins; pin_idx++) {
struct hdmi_spec_per_pin *per_pin = get_pin(spec, pin_idx);
struct hdmi_eld *pin_eld = &per_pin->sink_eld;
pin_eld->eld_valid = false;
hdmi_present_sense(per_pin, 0);
}
......
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