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Fri, 19 Jul 2024 16:06:34 +0000 Date: Fri, 19 Jul 2024 18:07:07 +0200 Message-ID: <875xt1s6vo.wl-tiwai@suse.de> From: Takashi Iwai To: wangdicheng Cc: lgirdwood@gmail.com, broonie@kernel.org, perex@perex.cz, tiwai@suse.com, linux-kernel@vger.kernel.org, alsa-devel@alsa-project.org, linux-arm-kernel@lists.infradead.org, wangdicheng Subject: Re: [PATCH v3] ALSA: usb-audio: Fix microphone sound on HD webcam. In-Reply-To: <20240719020906.8078-1-wangdich9700@163.com> References: <20240719020906.8078-1-wangdich9700@163.com> User-Agent: Wanderlust/2.15.9 (Almost Unreal) Emacs/27.2 Mule/6.0 MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=US-ASCII X-Spamd-Result: default: False [-0.31 / 50.00]; MID_CONTAINS_FROM(1.00)[]; DWL_DNSWL_LOW(-1.00)[suse.de:dkim]; R_DKIM_ALLOW(-0.20)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; MIME_GOOD(-0.10)[text/plain]; MX_GOOD(-0.01)[]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; FUZZY_BLOCKED(0.00)[rspamd.com]; FREEMAIL_TO(0.00)[163.com]; ARC_NA(0.00)[]; RBL_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:104:10:150:64:97:from]; TO_DN_SOME(0.00)[]; MIME_TRACE(0.00)[0:+]; TO_MATCH_ENVRCPT_ALL(0.00)[]; FREEMAIL_ENVRCPT(0.00)[163.com,gmail.com]; FREEMAIL_CC(0.00)[gmail.com,kernel.org,perex.cz,suse.com,vger.kernel.org,alsa-project.org,lists.infradead.org,kylinos.cn]; RCVD_COUNT_TWO(0.00)[2]; FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; SPAMHAUS_XBL(0.00)[2a07:de40:b281:104:10:150:64:97:from]; RCPT_COUNT_SEVEN(0.00)[9]; RCVD_VIA_SMTP_AUTH(0.00)[]; RECEIVED_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:106:10:150:64:167:received]; RCVD_TLS_ALL(0.00)[]; DKIM_TRACE(0.00)[suse.de:+]; DBL_BLOCKED_OPENRESOLVER(0.00)[imap1.dmz-prg2.suse.org:helo,imap1.dmz-prg2.suse.org:rdns,suse.de:dkim] X-Rspamd-Queue-Id: AE93921195 X-Rspamd-Action: no action X-Rspamd-Server: rspamd2.dmz-prg2.suse.org X-Spamd-Bar: / Message-ID-Hash: 77CSZAM6WUPSAKHD7F7TW3NWG7BZBVVI X-Message-ID-Hash: 77CSZAM6WUPSAKHD7F7TW3NWG7BZBVVI X-MailFrom: tiwai@suse.de X-Mailman-Rule-Misses: dmarc-mitigation; no-senders; approved; emergency; loop; banned-address; member-moderation; header-match-alsa-devel.alsa-project.org-0; header-match-alsa-devel.alsa-project.org-1; nonmember-moderation; administrivia; implicit-dest; max-recipients; max-size; news-moderation; no-subject; digests; suspicious-header X-Mailman-Version: 3.3.9 Precedence: list List-Id: "Alsa-devel mailing list for ALSA developers - http://www.alsa-project.org" Archived-At: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: On Fri, 19 Jul 2024 04:09:06 +0200, wangdicheng wrote: > > From: wangdicheng > > I own an external usb Webcam, HD webcam, which had low mic volume and > inconsistent sound quality. Video works as expected. > > (snip) > [ 95.473820][ 1] [ T73] usb 5-2.2: new high-speed USB device number 7 using xhci_hcd > [ 95.773974][ 1] [ T73] usb 5-2.2: New USB device found, idVendor=1bcf, idProduct=2281, bcdDevice= 0.05 > [ 95.783445][ 1] [ T73] usb 5-2.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 > [ 95.791872][ 1] [ T73] usb 5-2.2: Product: HD webcam > [ 95.797001][ 1] [ T73] usb 5-2.2: Manufacturer: Sunplus IT Co > [ 95.802996][ 1] [ T73] usb 5-2.2: SerialNumber: 20200513 > [ 96.092610][ 2] [ T3680] usb 5-2.2: Warning! Unlikely big volume range (=4096), cval->res is probably wrong. > [ 96.102436][ 2] [ T3680] usb 5-2.2: [5] FU [Mic Capture Volume] ch = 1, val = 0/4096/1 > > Set up quirk cval->res to 16 for 256 levels, > Set GET_SAMPLE_RATE quirk flag to stop trying to get the sample rate. > Confirmed that happened anyway later due to the backoff mechanism, > After 3 failures. > > All audio stream on device interfaces share the same values, > apart from wMaxPacketSize and tSamFreq : > > bLength 9 > bDescriptorType 4 > bInterfaceNumber 3 > bAlternateSetting 4 > bNumEndpoints 1 > bInterfaceClass 1 Audio > > Interface Descriptor: > bLength 9 > bDescriptorType 4 > bInterfaceNumber 3 > bAlternateSetting 4 > bNumEndpoints 1 > bInterfaceClass 1 Audio > bInterfaceSubClass 2 Streaming > bInterfaceProtocol 0 > iInterface 0 > AudioStreaming Interface Descriptor: > bLength 7 > bDescriptorType 36 > bDescriptorSubtype 1 (AS_GENERAL) > bTerminalLink 3 > bDelay 1 frames > wFormatTag 0x0001 PCM > AudioStreaming Interface Descriptor: > bLength 11 > bDescriptorType 36 > bDescriptorSubtype 2 (FORMAT_TYPE) > bFormatType 1 (FORMAT_TYPE_I) > bNrChannels 1 > bSubframeSize 2 > bBitResolution 16 > bSamFreqType 1 Discrete > tSamFreq[ 0] 48000 > Endpoint Descriptor: > bLength 9 > bDescriptorType 5 > bEndpointAddress 0x86 EP 6 IN > bmAttributes 5 > Transfer Type Isochronous > Synch Type Asynchronous > Usage Type Data > wMaxPacketSize 0x0064 1x 100 bytes > bInterval 4 > bRefresh 0 > bSynchAddress 0 > AudioStreaming Endpoint Descriptor: > bLength 7 > bDescriptorType 37 > bDescriptorSubtype 1 (EP_GENERAL) > bmAttributes 0x01 > Sampling Frequency > bLockDelayUnits 0 Undefined > wLockDelay 0x0000 > (snip) > > Testing patch provides consistent good sound recording quality and volume range. > > (snip) > [ 95.473820][ 1] [ T73] usb 5-2.2: new high-speed USB device number 7 using xhci_hcd > [ 95.773974][ 1] [ T73] usb 5-2.2: New USB device found, idVendor=1bcf, idProduct=2281, bcdDevice= 0.05 > [ 95.783445][ 1] [ T73] usb 5-2.2: New USB device strings: Mfr=1, Product=2, SerialNumber=3 > [ 95.791872][ 1] [ T73] usb 5-2.2: Product: HD webcam > [ 95.797001][ 1] [ T73] usb 5-2.2: Manufacturer: Sunplus IT Co > [ 95.802996][ 1] [ T73] usb 5-2.2: SerialNumber: 20200513 > [ 96.110630][ 3] [ T3680] usbcore: registered new interface driver snd-usb-audio > [ 96.114329][ 7] [ T3677] usb 5-2.2: Found UVC 1.00 device HD webcam (1bcf:2281) > [ 96.167555][ 7] [ T3677] usbcore: registered new interface driver uvcvideo > > Signed-off-by: wangdicheng > --- > v2 -> v3: make the mail address of Signed-off-by consistent with the From address > V1 -> V2: align the space,Update code to v6.8-rc3,and make modifications based on it Thanks, applied now. Takashi