ALSA: usb-audio: Add clock validity quirk for Denon MC7000/MCX8000

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commit 9f35a31283 upstream.

It should be safe to ignore clock validity check result if the following
conditions are met:
 - only one single sample rate is supported;
 - the terminal is directly connected to the clock source;
 - the clock type is internal.

This is to deal with some Denon DJ controllers that always reports that
clock is invalid.

Tested-by: Tobias Oszlanyi <toszlanyi@yahoo.de>
Signed-off-by: Alexander Tsoy <alexander@tsoy.me>
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20200212235450.697348-1-alexander@tsoy.me
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

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Alexander Tsoy 2020-02-13 02:54:50 +03:00 • committed by Greg Kroah-Hartman

parent 2fc4820647

commit 2b99190d64

3 changed files with 66 additions and 32 deletions

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91

sound/usb/clock.c

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4

sound/usb/clock.h

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3

sound/usb/format.c

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