Commit 93f9d1a4 authored Feb 11, 2020 by Arvind Sankar Committed by Takashi Iwai Feb 11, 2020

ALSA: usb-audio: Apply sample rate quirk for Audioengine D1



The Audioengine D1 (0x2912:0x30c8) does support reading the sample rate,
but it returns the rate in byte-reversed order.

When setting sampling rate, the driver produces these warning messages:
[168840.944226] usb 3-2.2: current rate 4500480 is different from the runtime rate 44100
[168854.930414] usb 3-2.2: current rate 8436480 is different from the runtime rate 48000
[168905.185825] usb 3-2.1.2: current rate 30465 is different from the runtime rate 96000

As can be seen from the hexadecimal conversion, the current rate read
back is byte-reversed from the rate that was set.

44100 == 0x00ac44, 4500480 == 0x44ac00
48000 == 0x00bb80, 8436480 == 0x80bb00
96000 == 0x017700,   30465 == 0x007701

Rather than implementing a new quirk to reverse the order, just skip
checking the rate to avoid spamming the log.

Signed-off-by: Arvind Sankar <nivedita@alum.mit.edu>
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20200211162235.1639889-1-nivedita@alum.mit.edu


Signed-off-by: Takashi Iwai <tiwai@suse.de>

parent d75a170f

sound/usb/quirks.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -1440,6 +1440,7 @@ bool snd_usb_get_sample_rate_quirk(struct snd_usb_audio *chip)
		case USB_ID(0x1395, 0x740a): /* Sennheiser DECT */
		case USB_ID(0x1901, 0x0191): /* GE B850V3 CP2114 audio interface */
		case USB_ID(0x21b4, 0x0081): /* AudioQuest DragonFly */
		case USB_ID(0x2912, 0x30c8): /* Audioengine D1 */
		return true;
		}

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