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Fri, 14 Nov 2025 13:19:33 +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 U6/zE2UsF2k4NgAAD6G6ig (envelope-from ); Fri, 14 Nov 2025 13:19:33 +0000 Date: Fri, 14 Nov 2025 14:19:32 +0100 Message-ID: <87o6p4iwez.wl-tiwai@suse.de> From: Takashi Iwai To: Lushih Hsieh Cc: Jaroslav Kysela , Takashi Iwai , linux-sound@vger.kernel.org Subject: Re: [PATCH] ALSA: usb-audio: Add native DSD quirks for PureAudio DAC series In-Reply-To: <20251114052053.54989-1-bruce@mail.kh.edu.tw> References: <20251114052053.54989-1-bruce@mail.kh.edu.tw> User-Agent: Wanderlust/2.15.9 (Almost Unreal) Emacs/30.1 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-Spamd-Result: default: False [-3.30 / 50.00]; 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)[]; ARC_NA(0.00)[]; RCVD_TLS_ALL(0.00)[]; TO_DN_SOME(0.00)[]; MIME_TRACE(0.00)[0:+]; FUZZY_RATELIMITED(0.00)[rspamd.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]; DBL_BLOCKED_OPENRESOLVER(0.00)[imap1.dmz-prg2.suse.org:helo,suse.de:mid,kh.edu.tw:email] X-Spam-Flag: NO X-Spam-Score: -3.30 X-Spam-Level: On Fri, 14 Nov 2025 06:20:53 +0100, Lushih Hsieh wrote: > > The PureAudio APA DAC and Lotus DAC5 series are USB Audio > 2.0 Class devices that support native Direct Stream Digital (DSD) > playback via specific vendor protocols. > > Without these quirks, the devices may only function in standard > PCM mode, or fail to correctly report their DSD format capabilities > to the ALSA framework, preventing native DSD playback under Linux. > > This commit adds new quirk entries for the mentioned DAC models > based on their respective Vendor/Product IDs (VID:PID), for example: > 0x16d0:0x0ab1 (APA DAC), 0x16d0:0xeca1 (DAC5 series), etc. > > The quirk ensures correct DSD format handling by setting the required > SNDRV_PCM_FMTBIT_DSD_U32_BE format bit and defining the DSD-specific > Audio Class 2.0 (AC2.0) endpoint configurations. This allows the ALSA > DSD API to correctly address the device for high-bitrate DSD streams, > bypassing the need for DoP (DSD over PCM). > > Test on APA DAC and Lotus DAC5 SE under Arch Linux. > > Tested-by: Lushih Hsieh > > Signed-off-by: Lushih Hsieh Thanks, applied now. Takashi