From patchwork Wed Jan 9 07:08:55 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Paul Elder X-Patchwork-Id: 10753515 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 8F0806C2 for ; Wed, 9 Jan 2019 07:10:16 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7B956205F7 for ; Wed, 9 Jan 2019 07:10:16 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 6F59128DE0; Wed, 9 Jan 2019 07:10:16 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 054E1205F7 for ; Wed, 9 Jan 2019 07:10:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729821AbfAIHJ6 (ORCPT ); Wed, 9 Jan 2019 02:09:58 -0500 Received: from perceval.ideasonboard.com ([213.167.242.64]:50382 "EHLO perceval.ideasonboard.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729800AbfAIHJ5 (ORCPT ); Wed, 9 Jan 2019 02:09:57 -0500 Received: from localhost.localdomain (unknown [96.44.9.117]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id EADEA56D; Wed, 9 Jan 2019 08:09:54 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1547017796; bh=WlT7QVzq4xgbAWg6x7iDTM9KkOZJPPm4a6Ht5yOw2qo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=QzXRUH8JMfSG7y2Ye63lQerDKKwdqSGXMrQ7K54qIjP/ObO//N4coE8za3kXaLCQo N+HZP8jCHV1ekyxlVjYf8uaxVJVdQMbyUOaNKCmE/8dEVb+jghHToAk3LkbQ4o+qgH ndPfxYZXRrfVxvHZ7VWR8RJjnJiuCCkoYG02GDfU= From: Paul Elder To: laurent.pinchart@ideasonboard.com, kieran.bingham@ideasonboard.com Cc: Paul Elder , b-liu@ti.com, stern@rowland.harvard.edu, rogerq@ti.com, balbi@kernel.org, gregkh@linuxfoundation.org, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v5 5/6] usb: musb: gadget: implement optional explicit status stage Date: Wed, 9 Jan 2019 02:08:55 -0500 Message-Id: <20190109070856.27460-6-paul.elder@ideasonboard.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190109070856.27460-1-paul.elder@ideasonboard.com> References: <20190109070856.27460-1-paul.elder@ideasonboard.com> MIME-Version: 1.0 Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Implement the mechanism for optional explicit status stage for the MUSB driver. This allows a function driver to specify what to reply for the status stage. The functionality for an implicit status stage is retained. Signed-off-by: Paul Elder v1 Reviewed-by: Laurent Pinchart v1 Acked-by: Bin Liu --- Changes from v4: - call usb_gadget_control_complete before usb_gadget_giveback_request - set musb ep0 state to statusin in ep0_send_ack - make sure to not double-write musb register in ep0_rxstate, since musb_g_ep0_giveback will take care of writing them No change from v3 Changes from v2: - update call to usb_gadget_control_complete to include status - since sending STALL from the function driver is now done with usb_ep_set_halt, there is no need for the internal ep0_send_response to take a stall/ack parameter; remove the parameter and make the function only send ack, and remove checking for the status reply in the usb_request for the status stage Changes from v1: - obvious change to implement v2 mechanism laid out by 4/6 of this series (send_response, and musb_g_ep0_send_response function has been removed, call to usb_gadget_control_complete has been added) - ep0_send_response's ack argument has been changed from stall - last_packet flag in ep0_rxstate has been removed, since it is equal to req != NULL drivers/usb/musb/musb_gadget.c | 2 ++ drivers/usb/musb/musb_gadget_ep0.c | 29 +++++++++++++++++++++++++++-- 2 files changed, 29 insertions(+), 2 deletions(-) diff --git a/drivers/usb/musb/musb_gadget.c b/drivers/usb/musb/musb_gadget.c index 496643f54faa..ff83578c181f 100644 --- a/drivers/usb/musb/musb_gadget.c +++ b/drivers/usb/musb/musb_gadget.c @@ -144,6 +144,8 @@ __acquires(ep->musb->lock) unmap_dma_buffer(req, musb); trace_musb_req_gb(req); + if (req->ep->end_point.address == 0) + usb_gadget_control_complete(&musb->g, &req->request); usb_gadget_giveback_request(&req->ep->end_point, &req->request); spin_lock(&musb->lock); ep->busy = busy; diff --git a/drivers/usb/musb/musb_gadget_ep0.c b/drivers/usb/musb/musb_gadget_ep0.c index 91a5027b5c1f..dc5abdf9d49e 100644 --- a/drivers/usb/musb/musb_gadget_ep0.c +++ b/drivers/usb/musb/musb_gadget_ep0.c @@ -458,6 +458,25 @@ __acquires(musb->lock) return handled; } +static int ep0_send_ack(struct musb *musb) +{ + void __iomem *regs = musb->control_ep->regs; + u16 csr; + + if (musb->ep0_state != MUSB_EP0_STAGE_RX && + musb->ep0_state != MUSB_EP0_STAGE_STATUSIN) + return -EINVAL; + + csr = MUSB_CSR0_P_DATAEND | MUSB_CSR0_P_SVDRXPKTRDY; + + musb_ep_select(musb->mregs, 0); + musb_writew(regs, MUSB_CSR0, csr); + + musb->ep0_state = MUSB_EP0_STAGE_STATUSIN; + + return 0; +} + /* we have an ep0out data packet * Context: caller holds controller lock */ @@ -504,12 +523,15 @@ static void ep0_rxstate(struct musb *musb) if (req) { musb->ackpend = csr; musb_g_ep0_giveback(musb, req); + if (req->explicit_status) + return; if (!musb->ackpend) return; musb->ackpend = 0; + } else { + musb_ep_select(musb->mregs, 0); + musb_writew(regs, MUSB_CSR0, csr); } - musb_ep_select(musb->mregs, 0); - musb_writew(regs, MUSB_CSR0, csr); } /* @@ -939,6 +961,9 @@ musb_g_ep0_queue(struct usb_ep *e, struct usb_request *r, gfp_t gfp_flags) case MUSB_EP0_STAGE_ACKWAIT: /* zero-length data */ status = 0; break; + case MUSB_EP0_STAGE_STATUSIN: + status = ep0_send_ack(musb); + goto cleanup; default: musb_dbg(musb, "ep0 request queued in state %d", musb->ep0_state);