From patchwork Fri Nov 25 15:34:50 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Grzeschik X-Patchwork-Id: 628975 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D98D6C43217 for ; Fri, 25 Nov 2022 15:35:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229611AbiKYPfB (ORCPT ); Fri, 25 Nov 2022 10:35:01 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56760 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229514AbiKYPe6 (ORCPT ); Fri, 25 Nov 2022 10:34:58 -0500 Received: from metis.ext.pengutronix.de (metis.ext.pengutronix.de [IPv6:2001:67c:670:201:290:27ff:fe1d:cc33]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C3E392D1DD for ; Fri, 25 Nov 2022 07:34:57 -0800 (PST) Received: from drehscheibe.grey.stw.pengutronix.de ([2a0a:edc0:0:c01:1d::a2]) by metis.ext.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1oyaj9-0005nu-KE; Fri, 25 Nov 2022 16:34:55 +0100 Received: from [2a0a:edc0:0:1101:1d::ac] (helo=dude04.red.stw.pengutronix.de) by drehscheibe.grey.stw.pengutronix.de with esmtp (Exim 4.94.2) (envelope-from ) id 1oyaj8-000Frf-0X; Fri, 25 Nov 2022 16:34:54 +0100 Received: from mgr by dude04.red.stw.pengutronix.de with local (Exim 4.94.2) (envelope-from ) id 1oyaj8-001Rde-5y; Fri, 25 Nov 2022 16:34:54 +0100 From: Michael Grzeschik To: linux-usb@vger.kernel.org Cc: linux-media@vger.kernel.org, gregkh@linuxfoundation.org, balbi@kernel.org, laurent.pinchart@ideasonboard.com, kernel@pengutronix.de, stable Subject: [PATCH v2 2/2] usb: gadget: uvc: limit isoc_sg to super speed gadgets Date: Fri, 25 Nov 2022 16:34:50 +0100 Message-Id: <20221125153450.344392-2-m.grzeschik@pengutronix.de> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20221125153450.344392-1-m.grzeschik@pengutronix.de> References: <20221125153450.344392-1-m.grzeschik@pengutronix.de> MIME-Version: 1.0 X-SA-Exim-Connect-IP: 2a0a:edc0:0:c01:1d::a2 X-SA-Exim-Mail-From: mgr@pengutronix.de X-SA-Exim-Scanned: No (on metis.ext.pengutronix.de); SAEximRunCond expanded to false X-PTX-Original-Recipient: linux-usb@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org When calling uvc_video_encode_isoc_sg the function is preparing the sg payload by setting the sglist pointers of the videobuffer for the request. The usb gadget driver then is parsing the sg list and uses each sg entry to send in one urb to the host. Because of the unrelated buffer of the uvc header that buffer has to be send separately in an extra sg entry. When it comes to transfers with an limited payload (e.g. the maximum of 3kB for high-speed) this extra payload handling is not justified. A simple memcpy of the header and payload is usually faster and does not come with that extra runtime overhead. This patch is changing the uvc_video_encode_isoc_sg encode function only to be used for super speed gadgets. Cc: stable Signed-off-by: Michael Grzeschik --- v1 -> v2: - left the sg assignment in uvc_buffer_sg under the test for use_sg - rephrased the commit message drivers/usb/gadget/function/uvc_queue.c | 3 +-- drivers/usb/gadget/function/uvc_video.c | 9 +++++++-- 2 files changed, 8 insertions(+), 4 deletions(-) diff --git a/drivers/usb/gadget/function/uvc_queue.c b/drivers/usb/gadget/function/uvc_queue.c index 0aa3d7e1f3cc32..0abb1763faf1b6 100644 --- a/drivers/usb/gadget/function/uvc_queue.c +++ b/drivers/usb/gadget/function/uvc_queue.c @@ -87,9 +87,8 @@ static int uvc_buffer_prepare(struct vb2_buffer *vb) if (queue->use_sg) { buf->sgt = vb2_dma_sg_plane_desc(vb, 0); buf->sg = buf->sgt->sgl; - } else { - buf->mem = vb2_plane_vaddr(vb, 0); } + buf->mem = vb2_plane_vaddr(vb, 0); buf->length = vb2_plane_size(vb, 0); if (vb->type == V4L2_BUF_TYPE_VIDEO_CAPTURE) buf->bytesused = 0; diff --git a/drivers/usb/gadget/function/uvc_video.c b/drivers/usb/gadget/function/uvc_video.c index dd1c6b2ca7c6f3..b6ea600b011185 100644 --- a/drivers/usb/gadget/function/uvc_video.c +++ b/drivers/usb/gadget/function/uvc_video.c @@ -459,6 +459,9 @@ static void uvcg_video_pump(struct work_struct *work) */ int uvcg_video_enable(struct uvc_video *video, int enable) { + struct uvc_device *uvc = video->uvc; + struct usb_composite_dev *cdev = uvc->func.config->cdev; + struct usb_gadget *gadget = cdev->gadget; unsigned int i; int ret; @@ -490,9 +493,11 @@ int uvcg_video_enable(struct uvc_video *video, int enable) if (video->max_payload_size) { video->encode = uvc_video_encode_bulk; video->payload_size = 0; - } else - video->encode = video->queue.use_sg ? + } else { + video->encode = (video->queue.use_sg && + !(gadget->speed <= USB_SPEED_HIGH)) ? uvc_video_encode_isoc_sg : uvc_video_encode_isoc; + } video->req_int_count = 0;