From patchwork Wed Dec 2 18:55:56 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Felipe Balbi X-Patchwork-Id: 57575 Delivered-To: patch@linaro.org Received: by 10.112.155.196 with SMTP id vy4csp3062258lbb; Wed, 2 Dec 2015 10:56:00 -0800 (PST) X-Received: by 10.66.221.163 with SMTP id qf3mr6877079pac.121.1449082560396; Wed, 02 Dec 2015 10:56:00 -0800 (PST) Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id ui10si6320882pac.7.2015.12.02.10.56.00; Wed, 02 Dec 2015 10:56:00 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-usb-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-usb-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-usb-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756436AbbLBSz6 (ORCPT + 4 others); Wed, 2 Dec 2015 13:55:58 -0500 Received: from bear.ext.ti.com ([192.94.94.41]:36527 "EHLO bear.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754662AbbLBSz6 (ORCPT ); Wed, 2 Dec 2015 13:55:58 -0500 Received: from dlelxv90.itg.ti.com ([172.17.2.17]) by bear.ext.ti.com (8.13.7/8.13.7) with ESMTP id tB2ItvrA018386 for ; Wed, 2 Dec 2015 12:55:57 -0600 Received: from DLEE71.ent.ti.com (dlee71.ent.ti.com [157.170.170.114]) by dlelxv90.itg.ti.com (8.14.3/8.13.8) with ESMTP id tB2Itvpr016550 for ; Wed, 2 Dec 2015 12:55:57 -0600 Received: from dflp33.itg.ti.com (10.64.6.16) by DLEE71.ent.ti.com (157.170.170.114) with Microsoft SMTP Server id 14.3.224.2; Wed, 2 Dec 2015 12:55:57 -0600 Received: from localhost (ileax41-snat.itg.ti.com [10.172.224.153]) by dflp33.itg.ti.com (8.14.3/8.13.8) with ESMTP id tB2Ituca004767; Wed, 2 Dec 2015 12:55:57 -0600 From: Felipe Balbi To: Linux USB Mailing List CC: Felipe Balbi Subject: [PATCH v2] usb: dwc3: gadget: handle request->zero Date: Wed, 2 Dec 2015 12:55:56 -0600 Message-ID: <1449082556-3534-1-git-send-email-balbi@ti.com> X-Mailer: git-send-email 2.6.3 MIME-Version: 1.0 Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org So far, dwc3 has always missed request->zero handling for every endpoint. Let's implement that so we can handle cases where transfer must be finished with a ZLP. Note that dwc3 is a little special. Even though we're dealing with a ZLP, we still need a buffer of wMaxPacketSize bytes; to hide that detail from every gadget driver, we have a preallocated buffer of 1024 bytes (biggest bulk size) to use (and share) among all endpoints. Reported-by: Ravi B Signed-off-by: Felipe Balbi --- since v1: - remove unnecessary 'free_on_complete' flag drivers/usb/dwc3/core.h | 3 +++ drivers/usb/dwc3/gadget.c | 51 +++++++++++++++++++++++++++++++++++++++++++++-- 2 files changed, 52 insertions(+), 2 deletions(-) -- 2.6.3 -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h index 36f1cb74588c..29130682e547 100644 --- a/drivers/usb/dwc3/core.h +++ b/drivers/usb/dwc3/core.h @@ -37,6 +37,7 @@ #define DWC3_MSG_MAX 500 /* Global constants */ +#define DWC3_ZLP_BUF_SIZE 1024 /* size of a superspeed bulk */ #define DWC3_EP0_BOUNCE_SIZE 512 #define DWC3_ENDPOINTS_NUM 32 #define DWC3_XHCI_RESOURCES_NUM 2 @@ -647,6 +648,7 @@ struct dwc3_scratchpad_array { * @ctrl_req: usb control request which is used for ep0 * @ep0_trb: trb which is used for the ctrl_req * @ep0_bounce: bounce buffer for ep0 + * @zlp_buf: used when request->zero is set * @setup_buf: used while precessing STD USB requests * @ctrl_req_addr: dma address of ctrl_req * @ep0_trb: dma address of ep0_trb @@ -734,6 +736,7 @@ struct dwc3 { struct usb_ctrlrequest *ctrl_req; struct dwc3_trb *ep0_trb; void *ep0_bounce; + void *zlp_buf; void *scratchbuf; u8 *setup_buf; dma_addr_t ctrl_req_addr; diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c index e341f034296f..5a77e9925939 100644 --- a/drivers/usb/dwc3/gadget.c +++ b/drivers/usb/dwc3/gadget.c @@ -1158,6 +1158,32 @@ out: return ret; } +static void __dwc3_gadget_ep_zlp_complete(struct usb_ep *ep, + struct usb_request *request) +{ + dwc3_gadget_ep_free_request(ep, request); +} + +static int __dwc3_gadget_ep_queue_zlp(struct dwc3 *dwc, struct dwc3_ep *dep) +{ + struct dwc3_request *req; + struct usb_request *request; + struct usb_ep *ep = &dep->endpoint; + + dwc3_trace(trace_dwc3_gadget, "queueing ZLP\n"); + request = dwc3_gadget_ep_alloc_request(ep, GFP_ATOMIC); + if (!request) + return -ENOMEM; + + request->length = 0; + request->buf = dwc->zlp_buf; + request->complete = __dwc3_gadget_ep_zlp_complete; + + req = to_dwc3_request(request); + + return __dwc3_gadget_ep_queue(dep, req); +} + static int dwc3_gadget_ep_queue(struct usb_ep *ep, struct usb_request *request, gfp_t gfp_flags) { @@ -1171,6 +1197,17 @@ static int dwc3_gadget_ep_queue(struct usb_ep *ep, struct usb_request *request, spin_lock_irqsave(&dwc->lock, flags); ret = __dwc3_gadget_ep_queue(dep, req); + + /* + * Okay, here's the thing, if gadget driver has requested for a ZLP by + * setting request->zero, instead of doing magic, we will just queue an + * extra usb_request ourselves so that it gets handled the same way as + * any other request. + */ + if (ret == 0 && request->zero && (request->length % ep->maxpacket == 0)) + ret = __dwc3_gadget_ep_queue_zlp(dwc, dep); + +out: spin_unlock_irqrestore(&dwc->lock, flags); return ret; @@ -2743,6 +2780,12 @@ int dwc3_gadget_init(struct dwc3 *dwc) goto err3; } + dwc->zlp_buf = kzalloc(DWC3_ZLP_BUF_SIZE, GFP_KERNEL); + if (!dwc->zlp_buf) { + ret = -ENOMEM; + goto err4; + } + dwc->gadget.ops = &dwc3_gadget_ops; dwc->gadget.max_speed = USB_SPEED_SUPER; dwc->gadget.speed = USB_SPEED_UNKNOWN; @@ -2762,16 +2805,19 @@ int dwc3_gadget_init(struct dwc3 *dwc) ret = dwc3_gadget_init_endpoints(dwc); if (ret) - goto err4; + goto err5; ret = usb_add_gadget_udc(dwc->dev, &dwc->gadget); if (ret) { dev_err(dwc->dev, "failed to register udc\n"); - goto err4; + goto err5; } return 0; +err5: + kfree(dwc->zlp_buf); + err4: dwc3_gadget_free_endpoints(dwc); dma_free_coherent(dwc->dev, DWC3_EP0_BOUNCE_SIZE, @@ -2804,6 +2850,7 @@ void dwc3_gadget_exit(struct dwc3 *dwc) dwc->ep0_bounce, dwc->ep0_bounce_addr); kfree(dwc->setup_buf); + kfree(dwc->zlp_buf); dma_free_coherent(dwc->dev, sizeof(*dwc->ep0_trb), dwc->ep0_trb, dwc->ep0_trb_addr);