On Tue, 11 Feb 2020 17:22:35 +0100, Arvind Sankar wrote:
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
Thanks, applied now with Cc to stable.
Takashi