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Mon, 28 Sep 2026 11:14:06 +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 0MyzOP1LumrILgAAD6G6ig (envelope-from ); Mon, 28 Sep 2026 11:14:06 +0000 Date: Mon, 28 Sep 2026 13:14:05 +0200 Message-ID: <874if97hmq.wl-tiwai@suse.de> From: Takashi Iwai To: Achilles Zhang Cc: Takashi Iwai , Jaroslav Kysela , linux-sound@vger.kernel.org Subject: Re: [PATCH] ALSA: usb-audio: Add native DSD quirk for HiBy FC4 In-Reply-To: <20260921024344.391912-1-bnqzzdf@gmail.com> References: <20260921024344.391912-1-bnqzzdf@gmail.com> User-Agent: Wanderlust/2.15.9 (Almost Unreal) Emacs/30.2 Mule/6.0 Precedence: bulk X-Mailing-List: linux-sound@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=US-ASCII X-Spam-Level: X-Rspamd-Action: no action X-Rspamd-Server: rspamd2.dmz-prg2.suse.org X-Rspamd-Queue-Id: 7052A226EE X-Spamd-Result: default: False [-3.51 / 50.00]; BAYES_HAM(-3.00)[99.99%]; MID_CONTAINS_FROM(1.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; R_DKIM_ALLOW(-0.20)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; NEURAL_HAM_SHORT(-0.20)[-1.000]; MIME_GOOD(-0.10)[text/plain]; MX_GOOD(-0.01)[]; ARC_NA(0.00)[]; FREEMAIL_TO(0.00)[gmail.com]; RCVD_VIA_SMTP_AUTH(0.00)[]; TO_DN_SOME(0.00)[]; MIME_TRACE(0.00)[0:+]; DNSWL_BLOCKED(0.00)[2a07:de40:b281:104:10:150:64:97:from]; RBL_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:104:10:150:64:97:from]; FREEMAIL_ENVRCPT(0.00)[gmail.com]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[4]; RCVD_TLS_ALL(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[suse.de:dkim,suse.de:mid,imap1.dmz-prg2.suse.org:rdns,imap1.dmz-prg2.suse.org:helo]; RCVD_COUNT_TWO(0.00)[2]; TO_MATCH_ENVRCPT_ALL(0.00)[]; DKIM_TRACE(0.00)[suse.de:+] X-Spam-Flag: NO X-Spam-Score: -3.51 On Mon, 21 Sep 2026 04:43:43 +0200, Achilles Zhang wrote: > > The HiBy FC4 with USB ID 32bb:0004 advertises its native DSD > stream as UAC2 RAW_DATA with a 4-byte, 32-bit subslot. Without a > quirk snd-usb-audio leaves this alternate setting as > SNDRV_PCM_FORMAT_SPECIAL, so userspace cannot select a native DSD > format. > > Mark the device with QUIRK_FLAG_DSD_RAW so the existing generic raw > DSD handling exposes the stream as DSD_U32_BE. > > Tested on an FC4 at DSD256. With the quirk the playback alternate > setting changes from SPECIAL to DSD_U32_BE and reports DOP=0, > bitrev=0; native DSD256 playback works correctly. > > Signed-off-by: Achilles Zhang Applied now. Thanks. Takashi