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Tue, 27 Oct 2026 07:29:12 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id 9A8oNcdS4GqAUwAAD6G6ig (envelope-from ); Tue, 27 Oct 2026 07:29:12 +0000 Date: Tue, 27 Oct 2026 08:29:11 +0100 Message-ID: <87se1r38l4.wl-tiwai@suse.de> From: Takashi Iwai To: Zak Brighton Knight Cc: Takashi Iwai , Jaroslav Kysela , linux-sound@vger.kernel.org Subject: Re: [PATCH] ALSA: usb-audio: Skip probe-time interface setup for MSI MAG X570S ALC4080 In-Reply-To: <20261026140934.3575940-1-zakbrightonknight@gmail.com> References: <20261026140934.3575940-1-zakbrightonknight@gmail.com> User-Agent: Wanderlust/2.15.9 (Almost Unreal) Emacs/30.2 Mule/6.0 X-Mailing-List: linux-sound@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=US-ASCII X-Spam-Flag: NO X-Spam-Level: X-Spamd-Result: default: False [-12.30 / 50.00]; SUSE_INTERNAL_BYPASS(-9.00)[]; BAYES_HAM(-3.00)[99.99%]; MID_CONTAINS_FROM(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; RCVD_VIA_SMTP_AUTH(0.00)[]; FREEMAIL_ENVRCPT(0.00)[gmail.com]; MIME_TRACE(0.00)[0:+]; ARC_NA(0.00)[]; TO_DN_SOME(0.00)[]; FREEMAIL_TO(0.00)[gmail.com]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[4]; FROM_EQ_ENVFROM(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; RCVD_TLS_ALL(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[imap1.dmz-prg2.suse.org:helo] X-Spam-Score: -12.30 On Mon, 26 Oct 2026 15:09:34 +0100, Zak Brighton Knight wrote: > > The Realtek ALC4080 USB audio on the MSI MAG X570S Tomahawk Max WiFi > (USB ID 0db0:a073, the same ID as the MAG X570S Torpedo Max mixer map) > has six streaming interfaces with 68 altsettings in total. For each of > them, __snd_usb_parse_audio_interface() switches the interface to alt 0, > initialises pitch and the sample rate and switches back, which costs > about 64 ms per altsetting here, mostly spent inside usb_set_interface(). > Probing the card therefore takes about 6.4 seconds, on every boot. > > That setup is redundant with snd_usb_endpoint_prepare() at stream-open > time, so set QUIRK_FLAG_SKIP_IFACE_SETUP for this device. > > Tested on 7.2.11 with the equivalent quirk_flags=0db0:a073:skip_iface_setup > module option, re-probing the device via its sysfs "authorized" > attribute: probe time went from 6.45 s to 0.57 s, all 68 altsettings > are still listed in /proc/asound/cardX/stream*, and playback and > capture work. > > Assisted-by: LLM > Signed-off-by: Zak Brighton Knight Applied now. Thanks. Takashi