Re: [PATCH] ALSA: usb-audio: Add iface reset and delay quirk for JKY Technology Q2A

On Fri, 24 Jul 2026 13:08:38 +0200,
Rong Zhang wrote:
> 
> Hi Takashi, Lianqin,
> 
> On Fri, 2026-07-24 at 08:29 +0000, ¤ wrote:
> > Setting up the interface when suspended/resuming fails on this card.
> > Adding a reset and delay quirk will eliminate this problem.
> > 
> > Note: This device misuses the Apple VID (0x05ac) & PID (0x110b).
> 
> The device's VID conflicts with Apple's, but there is no PID conflict,
> right?
> 
> If a manufacturer uses other's VID, it's a VID conflict. The device
> falls into this category.
> 
> If the manufacturer uses the same PID among different products, it's a
> PID conflict. I don't think it's the case of the device, unless JKY
> Technology reuses PID 0x110b for products other than Q2A.
> 
> > 
> > usb 1-1: New USB device found, idVendor=05ac, idProduct=110b
> > usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=3
> > usb 1-1: Product: Q2A
> > usb 1-1: Manufacturer: JKY Technology
> > usb 1-1: SerialNumber: 330270D2251225
> > 
> > Signed-off-by: Lianqin Hu <[email protected]>
> > ---
> >  sound/usb/quirks.c | 2 ++
> >  1 file changed, 2 insertions(+)
> > 
> > diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c
> > index 0de7c9d94259..ad2ce384e32d 100644
> > --- a/sound/usb/quirks.c
> > +++ b/sound/usb/quirks.c
> > @@ -2200,6 +2200,8 @@ struct usb_audio_quirk_flags_table {
> >  
> >  static const struct usb_audio_quirk_flags_table quirk_flags_table[] = {
> >  	/* Device and string descriptor matches */
> > +	DEVICE_STRING_FLG(0x05ac, 0x110b, "JKY Technology", "Q2A", /* JKY Technology Q2A */
> 
> Hence, I don't think it's necessary to match "Q2A" here.
> 
> Meanwhile, in any case, the comment should describe the VID/PID conflict
> instead of repeating the string descriptor(s) being matched, and the
> strings should break into another line.
> 
> See how commit b13031ca112a ("ALSA: usb-audio: Deconflict VID between
> Focusrite Novation & MV-SILICON") describe the conflict and arrange
> lines.
> 
> > +		   QUIRK_FLAG_FORCE_IFACE_RESET | QUIRK_FLAG_IFACE_DELAY),
> 
> Bad indent.
> 
> This is the first DEVICE_STRING_FLG() item, so please don't set a bad
> example. I would prefer:
> 
> 	DEVICE_STRING_FLG(0x05ac, 0x110b, /* VID conflicts with Apple */
> 			  "JKY Technology", NULL /* Q2A */,
> 			  QUIRK_FLAG_FORCE_IFACE_RESET | QUIRK_FLAG_IFACE_DELAY),
> 

OK, then I scratch the commit now :)
Please resubmit the corrected patch.


thanks,

Takashi