From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 532E57E for ; Wed, 2 Nov 2022 02:35:49 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5A5FBC433C1; Wed, 2 Nov 2022 02:35:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1667356549; bh=nSVIaQe21shosyRCzjpVGBj95sZznQ5k500tGbDQOZc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=k0aLldgF84ed9FjG8s4BnAa5dXfElSFauWB2TJrDoCrfh7AtwdHnNgwup6JTYlPfd u7cJgp3KOoiF7FmjJ/yu9jH80pBn8b4BLRcbfw48cbm6UIlVOyX/1VhbPGtC3pTok8 nlTv5pX0FwaLBPumaEXBszU8bIZJhtW9EP+RSFeQ= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Michael Grzeschik , stable Subject: [PATCH 6.0 019/240] usb: gadget: uvc: limit isoc_sg to super speed gadgets Date: Wed, 2 Nov 2022 03:29:54 +0100 Message-Id: <20221102022111.841850778@linuxfoundation.org> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221102022111.398283374@linuxfoundation.org> References: <20221102022111.398283374@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Michael Grzeschik commit 19905240aef0181d1e6944070eb85fce75f75bcd upstream. The overhead of preparing sg data is high for transfers with limited payload. When transferring isoc over high-speed usb the maximum payload is rather small which is a good argument no to use sg. This patch is changing the uvc_video_encode_isoc_sg encode function only to be used for super speed gadgets. Signed-off-by: Michael Grzeschik Cc: stable Link: https://lore.kernel.org/r/20221017221141.3134818-1-m.grzeschik@pengutronix.de Signed-off-by: Greg Kroah-Hartman --- drivers/usb/gadget/function/uvc_queue.c | 9 +++------ drivers/usb/gadget/function/uvc_video.c | 9 +++++++-- 2 files changed, 10 insertions(+), 8 deletions(-) --- a/drivers/usb/gadget/function/uvc_queue.c +++ b/drivers/usb/gadget/function/uvc_queue.c @@ -84,12 +84,9 @@ static int uvc_buffer_prepare(struct vb2 return -ENODEV; buf->state = UVC_BUF_STATE_QUEUED; - 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->sgt = vb2_dma_sg_plane_desc(vb, 0); + buf->sg = buf->sgt->sgl; + 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; --- a/drivers/usb/gadget/function/uvc_video.c +++ b/drivers/usb/gadget/function/uvc_video.c @@ -448,6 +448,9 @@ static void uvcg_video_pump(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; @@ -479,9 +482,11 @@ int uvcg_video_enable(struct uvc_video * 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;