[alsa-devel] [PATCH] ALSA: usb-audio: Disable quirks for BOSS Katana amplifiers

[Mailing Lists]

On Wed, 14 Oct 2020 at 17:12, Mike Oliphant <oliphant at nostatic.org> wrote:

> Keith - are you getting an implicit feedback endpoint created when you run
> with the patch?
>

Hi Mike,

It appears that I do. For reference I'm on kernel 5.4.0-51:

Bus 001 Device 007: ID 0582:01d6 Roland Corp. GT-1
Device Descriptor:
 bLength                18
 bDescriptorType         1
 bcdUSB               2.00
 bDeviceClass          255 Vendor Specific Class
 bDeviceSubClass         0
 bDeviceProtocol       255
 bMaxPacketSize0        64
 idVendor           0x0582 Roland Corp.
 idProduct          0x01d6
 bcdDevice            0.00
 iManufacturer           1 BOSS
 iProduct                2 GT-1
 iSerial                 0
 bNumConfigurations      1
 Configuration Descriptor:
   bLength                 9
   bDescriptorType         2
   wTotalLength       0x00bc
   bNumInterfaces          4
   bConfigurationValue     1
   iConfiguration          0
   bmAttributes         0xc0
     Self Powered
   MaxPower                0mA
   Interface Descriptor:
     bLength                 9
     bDescriptorType         4
     bInterfaceNumber        0
     bAlternateSetting       0
     bNumEndpoints           0
     bInterfaceClass       255 Vendor Specific Class
     bInterfaceSubClass    255 Vendor Specific Subclass
     bInterfaceProtocol      0
     iInterface              0
   Interface Descriptor:
     bLength                 9
     bDescriptorType         4
     bInterfaceNumber        1
     bAlternateSetting       0
     bNumEndpoints           0
     bInterfaceClass       255 Vendor Specific Class
     bInterfaceSubClass      2
     bInterfaceProtocol      2
     iInterface              0
     ** UNRECOGNIZED:  06 24 f1 01 00 00
   Interface Descriptor:
     bLength                 9
     bDescriptorType         4
     bInterfaceNumber        1
     bAlternateSetting       1
     bNumEndpoints           1
     bInterfaceClass       255 Vendor Specific Class
     bInterfaceSubClass      2
     bInterfaceProtocol      2
     iInterface              0
     ** UNRECOGNIZED:  07 24 01 01 00 01 00
     ** UNRECOGNIZED:  0b 24 02 01 02 04 18 01 44 ac 00
     ** UNRECOGNIZED:  06 24 f1 04 16 00
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x0d  EP 13 OUT
       bmAttributes            5
         Transfer Type            Isochronous
         Synch Type               Asynchronous
         Usage Type               Data
       wMaxPacketSize     0x0038  1x 56 bytes
       bInterval               1
   Interface Descriptor:
     bLength                 9
     bDescriptorType         4
     bInterfaceNumber        2
     bAlternateSetting       0
     bNumEndpoints           0
     bInterfaceClass       255 Vendor Specific Class
     bInterfaceSubClass      2
     bInterfaceProtocol      1
     iInterface              0
   Interface Descriptor:
     bLength                 9
     bDescriptorType         4
     bInterfaceNumber        2
     bAlternateSetting       1
     bNumEndpoints           1
     bInterfaceClass       255 Vendor Specific Class
     bInterfaceSubClass      2
     bInterfaceProtocol      1
     iInterface              0
     ** UNRECOGNIZED:  07 24 01 07 00 01 00
     ** UNRECOGNIZED:  0b 24 02 01 02 04 18 01 44 ac 00
     ** UNRECOGNIZED:  06 24 f1 04 16 00
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x8e  EP 14 IN
       bmAttributes           37
         Transfer Type            Isochronous
         Synch Type               Asynchronous
         Usage Type               Implicit feedback Data
       wMaxPacketSize     0x0038  1x 56 bytes
       bInterval               1
   Interface Descriptor:
     bLength                 9
     bDescriptorType         4
     bInterfaceNumber        3
     bAlternateSetting       0
     bNumEndpoints           2
     bInterfaceClass       255 Vendor Specific Class
     bInterfaceSubClass      3
     bInterfaceProtocol      0
     iInterface              0
     ** UNRECOGNIZED:  06 24 f1 02 01 01
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x03  EP 3 OUT
       bmAttributes            2
         Transfer Type            Bulk
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0200  1x 512 bytes
       bInterval               1
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x84  EP 4 IN
       bmAttributes            2
         Transfer Type            Bulk
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0200  1x 512 bytes
       bInterval               0
   Interface Descriptor:
     bLength                 9
     bDescriptorType         4
     bInterfaceNumber        3
     bAlternateSetting       1
     bNumEndpoints           2
     bInterfaceClass       255 Vendor Specific Class
     bInterfaceSubClass      3
     bInterfaceProtocol      0
     iInterface              0
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x03  EP 3 OUT
       bmAttributes            3
         Transfer Type            Interrupt
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0200  1x 512 bytes
       bInterval               4
     Endpoint Descriptor:
       bLength                 7
       bDescriptorType         5
       bEndpointAddress     0x85  EP 5 IN
       bmAttributes            3
         Transfer Type            Interrupt
         Synch Type               None
         Usage Type               Data
       wMaxPacketSize     0x0200  1x 512 bytes
       bInterval               4
Device Qualifier (for other device speed):
 bLength                10
 bDescriptorType         6
 bcdUSB               2.00
 bDeviceClass          255 Vendor Specific Class
 bDeviceSubClass         0
 bDeviceProtocol       255
 bMaxPacketSize0        64
 bNumConfigurations      1
can't get debug descriptor: Resource temporarily unavailable
Device Status:     0x0001
 Self Powered


-- 
Keith A Milner