Commit 0d58273b authored by Geoffrey D. Bennett's avatar Geoffrey D. Bennett Committed by Takashi Iwai
Browse files

ALSA: usb-audio: Skip clock selector for Focusrite devices 



Add QUIRK_FLAG_SKIP_CLOCK_SELECTOR for Focusrite devices.

During interface parsing, snd_usb_clock_find_source() reads the clock
selector value then writes it back unchanged. On Focusrite devices
this redundant write results in a ~300ms delay per altsetting, adding
~1.8s to probe time on a typical device with 6 altsettings.

Enabling SKIP_CLOCK_SELECTOR skips the redundant write-back.

Signed-off-by: default avatarGeoffrey D. Bennett <g@b4.vu>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
Link: https://patch.msgid.link/00e53ae0a508b41516b41833daa17823381a649c.1771594828.git.g@b4.vu
parent 38c32206

sound/usb/quirks.c

+1 −0
Original line number Diff line number Diff line
@@ -2424,6 +2424,7 @@ static const struct usb_audio_quirk_flags_table quirk_flags_table[] = { 
	VENDOR_FLG(0x07fd, /* MOTU */

		   QUIRK_FLAG_VALIDATE_RATES),

	VENDOR_FLG(0x1235, /* Focusrite Novation */

		   QUIRK_FLAG_SKIP_CLOCK_SELECTOR |

		   QUIRK_FLAG_SKIP_IFACE_SETUP),

	VENDOR_FLG(0x1511, /* AURALiC */

		   QUIRK_FLAG_DSD_RAW),