ALSA: usb-audio: don't try to get Benchmark DAC1 sample rate (9fc88ad6) · Commits · 戴 / test

Adding this quirk allows us to avoid the noisy "cannot get freq at ep 0x1" message in dmesg output every time playback starts. This ought to affect other Benchmark DAC1 variations using the same "Microchip Technology, Inc." chip as well, but I have only tested with the "Pre" variant. Signed-off-by:

Eric Wong <normalperson@yhbt.net> Cc: Joe Turner <joe@oampo.co.uk> Signed-off-by:

Takashi Iwai <tiwai@suse.de>

sound/usb/quirks.c

+7 −2

Original line number	Diff line number	Diff line
		@@ -1113,8 +1113,13 @@ void snd_usb_set_format_quirk(struct snd_usb_substream *subs,

		bool snd_usb_get_sample_rate_quirk(struct snd_usb_audio *chip)
		{
		/* MS Lifecam HD-5000 doesn't support reading the sample rate. */
		return chip->usb_id == USB_ID(0x045E, 0x076D);
		/* devices which do not support reading the sample rate. */
		switch (chip->usb_id) {
		case USB_ID(0x045E, 0x076D): /* MS Lifecam HD-5000 */
		case USB_ID(0x04D8, 0xFEEA): /* Benchmark DAC1 Pre */
		return true;
		}
		return false;
		}

		/* Marantz/Denon USB DACs need a vendor cmd to switch

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