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ALSA: usb-audio: remove Wireless USB dead code 

Wireless USB host controller support has been removed
from Linux Kernel more than 3 years ago in commit
caa6772db4 ("Staging: remove wusbcore and UWB from the
kernel tree."), and the associated code in the
snd-usb-audio driver became unused and untested.

If in the future somebody will return WUSB/UWB support
back to the kernel, the snd-usb-audio driver will reject
Wireless USB audio devices at probe stage, and this patch
should be reverted.

Signed-off-by: Ruslan Bilovol <ruslan.bilovol@gmail.com>
Link: https://lore.kernel.org/r/20230312222857.296623-1-ruslan.bilovol@gmail.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Ruslan Bilovol 2023-03-12 18:28:57 -04:00 committed by Takashi Iwai
parent 1a0cc0520b
commit ce8e5f202f
3 changed files with 1 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
sound/usb/card.c
View File

@ -609,7 +609,6 @@ static int snd_usb_audio_create(struct usb_interface *intf,
case USB_SPEED_LOW:
case USB_SPEED_FULL:
case USB_SPEED_HIGH:
case USB_SPEED_WIRELESS:
case USB_SPEED_SUPER:
case USB_SPEED_SUPER_PLUS:
break;

16
sound/usb/endpoint.c
View File

@ -1173,22 +1173,8 @@ static int data_ep_set_params(struct snd_usb_endpoint *ep)
*/
if (usb_pipein(ep->pipe) || ep->implicit_fb_sync) {
urb_packs = packs_per_ms;
/*
* Wireless devices can poll at a max rate of once per 4ms.
* For dataintervals less than 5, increase the packet count to
* allow the host controller to use bursting to fill in the
* gaps.
*/
if (snd_usb_get_speed(chip->dev) == USB_SPEED_WIRELESS) {
int interval = ep->datainterval;
while (interval < 5) {
urb_packs <<= 1;
++interval;
}
}
/* make capture URBs <= 1 ms and smaller than a period */
urb_packs = min(max_packs_per_urb, urb_packs);
urb_packs = min(max_packs_per_urb, packs_per_ms);
while (urb_packs > 1 && urb_packs * maxsize >= ep->cur_period_bytes)
urb_packs >>= 1;
ep->nurbs = MAX_URBS;

1
sound/usb/helper.c
View File

@ -108,7 +108,6 @@ unsigned char snd_usb_parse_datainterval(struct snd_usb_audio *chip,
{
switch (snd_usb_get_speed(chip->dev)) {
case USB_SPEED_HIGH:
case USB_SPEED_WIRELESS:
case USB_SPEED_SUPER:
case USB_SPEED_SUPER_PLUS:
if (get_endpoint(alts, 0)->bInterval >= 1 &&