34 lines
1.2 KiB
Diff
34 lines
1.2 KiB
Diff
From ec43e93b7e36e2baa6685da504b9db3ac7048ceb Mon Sep 17 00:00:00 2001
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From: Jonathan Bell <jonathan@raspberrypi.com>
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Date: Fri, 16 Apr 2021 11:40:23 +0100
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Subject: [PATCH] sound/usb: call usb_autopm_get_interface() for
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devices that should not be suspended
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Webcams with microphones are composite devices, and autosuspend is set
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at the device level. If uvcvideo is probed after snd-usb-audio, the effect
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of the quirk applied by snd-usb-audio is undone by uvcvideo's global
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application of autosuspend.
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Incrementing the interface's PM refcount in such cases prevents runtime PM
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from happening, thus the device is left active.
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Signed-off-by: Jonathan Bell <jonathan@raspberrypi.com>
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---
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sound/usb/quirks.c | 5 +++++
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1 file changed, 5 insertions(+)
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--- a/sound/usb/quirks.c
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+++ b/sound/usb/quirks.c
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@@ -531,6 +531,11 @@ static int setup_disable_autosuspend(str
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struct usb_driver *driver,
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const struct snd_usb_audio_quirk *quirk)
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{
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+ /*
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+ * Grab the interface, because on a webcam uvcvideo may race
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+ * with snd-usb-audio during probe and re-enable autosuspend.
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+ */
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+ usb_autopm_get_interface(iface);
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usb_disable_autosuspend(interface_to_usbdev(iface));
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return 1; /* Continue with creating streams and mixer */
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}
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