From 19905240aef0181d1e6944070eb85fce75f75bcd Mon Sep 17 00:00:00 2001 From: Michael Grzeschik Date: Tue, 18 Oct 2022 00:11:41 +0200 Subject: [PATCH] usb: gadget: uvc: limit isoc_sg to super speed gadgets 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(-) diff --git a/drivers/usb/gadget/function/uvc_queue.c b/drivers/usb/gadget/function/uvc_queue.c index 0aa3d7e1f3cc..782eaae93140 100644 --- 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_buffer *vb) 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; diff --git a/drivers/usb/gadget/function/uvc_video.c b/drivers/usb/gadget/function/uvc_video.c index dd1c6b2ca7c6..b6ea600b0111 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;