Re: [PATCH] ALSA: usb-audio: allow -EPIPE errors for some v2 messages

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On Tue, Oct 12, 2021 at 09:35:16AM +0200, Takashi Iwai wrote:
> On Mon, 11 Oct 2021 19:23:05 +0200,
> Greg Kroah-Hartman wrote:
> > 
> > On Mon, Oct 11, 2021 at 06:07:01PM +0200, Takashi Iwai wrote:
> > > Could you also post the contents of /proc/asound/card*/usbmixer (only
> > > for the corresponding device), too?
> > 
> > Sure, here it is:
> > 
> > USB Mixer: usb_id=0x30be0101, ctrlif=0, ctlerr=0
> > Card: Schiit Audio Schiit Hel at usb-0000:47:00.1-2.2, high speed
> >   Unit: 5
> >     Control: name="Mic - Input Jack", index=0
> >     Info: id=5, control=2, cmask=0x0, channels=1, type="BOOLEAN"
> >     Volume: min=0, max=1, dBmin=0, dBmax=0
> >   Unit: 7
> >     Control: name="Speaker - Output Jack", index=0
> >     Info: id=7, control=2, cmask=0x0, channels=1, type="BOOLEAN"
> >     Volume: min=0, max=1, dBmin=0, dBmax=0
> >   Unit: 13
> >     Control: name="PCM Playback Switch", index=0
> >     Info: id=13, control=1, cmask=0x0, channels=1, type="INV_BOOLEAN"
> >     Volume: min=0, max=1, dBmin=0, dBmax=0
> >   Unit: 17
> >     Control: name="Mic Capture Switch", index=0
> >     Info: id=17, control=1, cmask=0x0, channels=1, type="INV_BOOLEAN"
> >     Volume: min=0, max=1, dBmin=0, dBmax=0
> >   Unit: 18
> >     Control: name="Clock Source 18 Validity", index=0
> >     Info: id=18, control=2, cmask=0x0, channels=1, type="BOOLEAN"
> >     Volume: min=0, max=1, dBmin=0, dBmax=0
> >   Unit: 22
> >     Control: name="Clock Source 22 Validity", index=0
> >     Info: id=22, control=2, cmask=0x0, channels=1, type="BOOLEAN"
> >     Volume: min=0, max=1, dBmin=0, dBmax=0
> 
> Hm, I expected more exotic control that failed, but it was Mic Capture
> Switch, which should be treated normally.
> 
> Could you try the patch below?  This will still show other warning
> messages, but it'll forcibly initialize the mixer elements at probe
> time, and the rest should work.
> 
> Once after it's confirmed to work, we may shut up the device warnings
> with a quirk.

Only one warning message shows up, here's the dmesg with this patch
applied:


[Oct12 14:39] usb 7-2.2: new high-speed USB device number 10 using xhci_hcd
[  +0.123157] usb 7-2.2: New USB device found, idVendor=30be, idProduct=0101, bcdDevice= 1.02
[  +0.000009] usb 7-2.2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[  +0.000003] usb 7-2.2: Product: Schiit Hel
[  +0.000002] usb 7-2.2: Manufacturer: Schiit Audio
[  +0.339785] usb 7-2.2: 17:0: failed to get current value for ch 0 (-32)
[  +0.020373] input: Schiit Audio Schiit Hel as /devices/pci0000:40/0000:40:01.1/0000:41:00.0/0000:42:08.0/0000:47:00.1/usb7/7-2/7-2.2/7-2.2:1.3/0003:30BE:0101.000B/input/input24
[  +0.056868] hid-generic 0003:30BE:0101.000B: input,hidraw6: USB HID v1.00 Device [Schiit Audio Schiit Hel] on usb-0000:47:00.1-2.2/input3


I don't see a "mic capture switch" on this device, but maybe it triggers
when I plug a mic into the microphone port, which is currently empty?

thanks,

greg k-h



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