From patchwork Tue Oct 17 08:39:18 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Charles Yi X-Patchwork-Id: 13424796 Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 264A73D979 for ; Tue, 17 Oct 2023 08:39:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=163.com header.i=@163.com header.b="lEzTpX+o" Received: from m12.mail.163.com (m12.mail.163.com [220.181.12.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id B4CFA93; Tue, 17 Oct 2023 01:39:36 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=163.com; s=s110527; h=From:Subject:Date:Message-Id:MIME-Version; bh=krMrh +gnj9GwvY8PuJ2nHyEgdmzG0vhrGe+vOfvIw9Q=; b=lEzTpX+orqfVJ2Q9JhMlE +uWRMpNh5usXqsk/LmzkJH+Ow6i/A5MDgMGkt40XiVkd9CJjWeWOlrn2iWfg8gvr Mo1OK27vnQp89o90Tx8ytYEsZUi50V3+LMBSgrMR/WmP6X9pMESdWJz5TfzgntnV XURDX5D6QZ98BU42et/WHs= Received: from ubuntu.. (unknown [171.83.47.247]) by zwqz-smtp-mta-g5-4 (Coremail) with SMTP id _____wDnNwI6SC5lUGceAw--.33359S2; Tue, 17 Oct 2023 16:39:22 +0800 (CST) From: Charles To: gregkh@linuxfoundation.org Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Charles Subject: [PATCH] usb: gadget: f_uac1: add adaptive sync support for capture Date: Tue, 17 Oct 2023 16:39:18 +0800 Message-Id: <20231017083918.1149647-1-be286@163.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-CM-TRANSID: _____wDnNwI6SC5lUGceAw--.33359S2 X-Coremail-Antispam: 1Uf129KBjvJXoWxAr15JF47Ww4xWFW8ZF1xAFb_yoWrCr1kpw 4UC3y0yr45ArZIqr4rAF4rAF43Aa1xG345GrW7Ww4Yganxt3sava42yryFkF17AFWrCw40 qF4Fgw1a9w4kCrJanT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDUYxBIdaVFxhVjvjDU0xZFpf9x0pRwvtXUUUUU= X-Originating-IP: [171.83.47.247] X-CM-SenderInfo: dehsmli6rwjhhfrp/1tbiWxIK0mI0cRDTdAADsC X-Spam-Status: No, score=-1.8 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_ENVFROM_END_DIGIT, FREEMAIL_FROM,RCVD_IN_DNSWL_BLOCKED,RCVD_IN_MSPIKE_BL, RCVD_IN_MSPIKE_L4,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net UAC1 has it's own freerunning clock and can update Host about real clock frequency through feedback endpoint so Host can align number of samples sent to the UAC1 to prevent overruns/underruns. Change UAC1 driver to make it configurable through additional 'c_sync' configfs file. Default remains 'asynchronous' with possibility to switch it to 'adaptive'. Signed-off-by: Charles --- drivers/usb/gadget/function/f_uac1.c | 31 ++++++++++++++++++++++++++++ drivers/usb/gadget/function/u_uac1.h | 2 ++ 2 files changed, 33 insertions(+) diff --git a/drivers/usb/gadget/function/f_uac1.c b/drivers/usb/gadget/function/f_uac1.c index 6f0e1d803dc2..0a8e55b19ee7 100644 --- a/drivers/usb/gadget/function/f_uac1.c +++ b/drivers/usb/gadget/function/f_uac1.c @@ -33,6 +33,8 @@ #define FUOUT_EN(_opts) ((_opts)->c_mute_present \ || (_opts)->c_volume_present) +#define EPOUT_FBACK_IN_EN(_opts) ((_opts)->c_sync == USB_ENDPOINT_SYNC_ASYNC) + struct f_uac1 { struct g_audio g_audio; u8 ac_intf, as_in_intf, as_out_intf; @@ -227,6 +229,16 @@ static struct uac_iso_endpoint_descriptor as_iso_out_desc = { .wLockDelay = cpu_to_le16(1), }; +static struct usb_endpoint_descriptor as_fback_ep_desc = { + .bLength = USB_DT_ENDPOINT_SIZE, + .bDescriptorType = USB_DT_ENDPOINT, + + .bEndpointAddress = USB_DIR_IN, + .bmAttributes = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_USAGE_FEEDBACK, + .wMaxPacketSize = cpu_to_le16(3), + .bInterval = 1, +}; + static struct uac_format_type_i_discrete_descriptor as_in_type_i_desc = { .bLength = 0, /* filled on rate setup */ .bDescriptorType = USB_DT_CS_INTERFACE, @@ -280,6 +292,7 @@ static struct usb_descriptor_header *f_audio_desc[] = { (struct usb_descriptor_header *)&as_out_ep_desc, (struct usb_descriptor_header *)&as_iso_out_desc, + (struct usb_descriptor_header *)&as_fback_ep_desc, (struct usb_descriptor_header *)&as_in_interface_alt_0_desc, (struct usb_descriptor_header *)&as_in_interface_alt_1_desc, @@ -1107,6 +1120,9 @@ static void setup_descriptor(struct f_uac1_opts *opts) f_audio_desc[i++] = USBDHDR(&as_out_type_i_desc); f_audio_desc[i++] = USBDHDR(&as_out_ep_desc); f_audio_desc[i++] = USBDHDR(&as_iso_out_desc); + if (EPOUT_FBACK_IN_EN(opts)) { + f_audio_desc[i++] = USBDHDR(&as_fback_ep_desc); + } } if (EPIN_EN(opts)) { f_audio_desc[i++] = USBDHDR(&as_in_interface_alt_0_desc); @@ -1317,6 +1333,12 @@ static int f_audio_bind(struct usb_configuration *c, struct usb_function *f) ac_header_desc->baInterfaceNr[ba_iface_id++] = status; uac1->as_out_intf = status; uac1->as_out_alt = 0; + + if (EPOUT_FBACK_IN_EN(audio_opts)) { + as_out_ep_desc.bmAttributes = + USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC; + as_out_interface_alt_1_desc.bNumEndpoints++; + } } if (EPIN_EN(audio_opts)) { @@ -1354,6 +1376,13 @@ static int f_audio_bind(struct usb_configuration *c, struct usb_function *f) goto err_free_fu; audio->out_ep = ep; audio->out_ep->desc = &as_out_ep_desc; + if (EPOUT_FBACK_IN_EN(audio_opts)) { + audio->in_ep_fback = usb_ep_autoconfig(gadget, + &as_fback_ep_desc); + if (!audio->in_ep_fback) { + goto err_free_fu; + } + } } if (EPIN_EN(audio_opts)) { @@ -1685,6 +1714,8 @@ static struct usb_function_instance *f_audio_alloc_inst(void) opts->req_number = UAC1_DEF_REQ_NUM; + opts->c_sync = UAC1_DEF_CSYNC; + snprintf(opts->function_name, sizeof(opts->function_name), "AC Interface"); return &opts->func_inst; diff --git a/drivers/usb/gadget/function/u_uac1.h b/drivers/usb/gadget/function/u_uac1.h index f7a616760e31..c6e2271e8cdd 100644 --- a/drivers/usb/gadget/function/u_uac1.h +++ b/drivers/usb/gadget/function/u_uac1.h @@ -27,6 +27,7 @@ #define UAC1_DEF_MAX_DB 0 /* 0 dB */ #define UAC1_DEF_RES_DB (1*256) /* 1 dB */ +#define UAC1_DEF_CSYNC USB_ENDPOINT_SYNC_ASYNC struct f_uac1_opts { struct usb_function_instance func_inst; @@ -56,6 +57,7 @@ struct f_uac1_opts { struct mutex lock; int refcnt; + int c_sync; }; #endif /* __U_UAC1_H */