From 93f9d1a4ac5930654c17412e3911b46ece73755a Mon Sep 17 00:00:00 2001

From: Arvind Sankar <nivedita@alum.mit.edu>

Date: Tue, 11 Feb 2020 11:22:35 -0500

Subject: [PATCH] ALSA: usb-audio: Apply sample rate quirk for Audioengine D1

Git-commit: 93f9d1a4ac5930654c17412e3911b46ece73755a

References: git-fixes

Patch-mainline: v5.6-rc2

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>

Signed-off-by: Oliver Neukum <oneukum@suse.com>

---

 sound/usb/quirks.c |    1 +

 1 file changed, 1 insertion(+)

--- a/sound/usb/quirks.c

+++ b/sound/usb/quirks.c

@@ -1281,6 +1281,7 @@ bool snd_usb_get_sample_rate_quirk(struc

 	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;

 	}