The video data endpoint of uvc can be implemented as either an
isochronous or a bulk endpoint.
The transmission speed of bulk mode is faster than isochronous mode.
I tested the speed with cdns3 (USB 3.2 Gen1), it's difficult to reach
2 Gbps in the isochronous mode, and it can exceed 4 Gbps in the bulk
mode.
A VideoStreaming interface with isochronous endpoints must have alternate
settings that can be used to change certain characteristics of the
interface and underlying endpoint(s). A typical use of alternate settings
is to provide a way to change the bandwidth requirements an active
isochronous pipe imposes on the USB.
A VideoStreaming interface containing a bulk endpoint for streaming shall
support only alternate setting zero. Additional alternate settings
containing bulk endpoints are not permitted in a device that is compliant
with the Video Class specification.
Here shows an example of the configfs differences:
if [ $BULK -eq 1 ]; then
echo "bulk" > functions/$FUNC/streaming_transfer
echo $(( 1024 * N )) > functions/$FUNC/streaming_maxpacket
else
echo "isoc" > functions/$FUNC/streaming_transfer
echo 1024 > functions/$FUNC/streaming_maxpacket
fi
Signed-off-by: Jing Leng <[email protected]>
---
ChangeLog v4->v5:
- Rebase the patch.
- Make email addresses ('From' and 'Signed-off-by') consistent.
ChangeLog v3->v4:
- echo "bulk" > functions/$FUNC/streaming_transfer to set bulk mode
ChangeLog v2->v3:
- Mistakenly deleted the definition of i and USBDHDR when porting from my workdir.
- Reported-by: kernel test robot <[email protected]>
ChangeLog v1->v2:
- Handle imagesize in uvc_v4l2_set_format. If it's not handled,
- switching from low resolution to high resolution will fail to play.
---
.../ABI/testing/configfs-usb-gadget-uvc | 8 +-
Documentation/usb/gadget-testing.rst | 1 +
drivers/usb/gadget/function/f_uvc.c | 228 +++++++++++++-----
drivers/usb/gadget/function/u_uvc.h | 1 +
drivers/usb/gadget/function/uvc.h | 2 +
drivers/usb/gadget/function/uvc_configfs.c | 64 ++++-
drivers/usb/gadget/function/uvc_queue.c | 14 +-
drivers/usb/gadget/function/uvc_video.c | 16 +-
8 files changed, 261 insertions(+), 73 deletions(-)
diff --git a/Documentation/ABI/testing/configfs-usb-gadget-uvc b/Documentation/ABI/testing/configfs-usb-gadget-uvc
index 611b23e6488d..ffa2fd8c7fcd 100644
--- a/Documentation/ABI/testing/configfs-usb-gadget-uvc
+++ b/Documentation/ABI/testing/configfs-usb-gadget-uvc
@@ -3,12 +3,14 @@ Date: Dec 2014
KernelVersion: 4.0
Description: UVC function directory
- =================== =============================
+ =================== ===================================
streaming_maxburst 0..15 (ss only)
- streaming_maxpacket 1..1023 (fs), 1..3072 (hs/ss)
+ streaming_maxpacket isoc: 1..1023 (fs), 1..3072 (hs/ss)
+ bulk: 1024..0x40000000
streaming_interval 1..16
+ streaming_transfer isoc/bulk
function_name string [32]
- =================== =============================
+ =================== ===================================
What: /config/usb-gadget/gadget/functions/uvc.name/control
Date: Dec 2014
diff --git a/Documentation/usb/gadget-testing.rst b/Documentation/usb/gadget-testing.rst
index 2278c9ffb74a..880af56abe8b 100644
--- a/Documentation/usb/gadget-testing.rst
+++ b/Documentation/usb/gadget-testing.rst
@@ -793,6 +793,7 @@ The uvc function provides these attributes in its function directory:
streaming_maxpacket maximum packet size this endpoint is capable of
sending or receiving when this configuration is
selected
+ streaming_transfer specify data transmission mode (isoc/bulk)
function_name name of the interface
=================== ================================================
diff --git a/drivers/usb/gadget/function/f_uvc.c b/drivers/usb/gadget/function/f_uvc.c
index 6e196e06181e..8a4df750e00d 100644
--- a/drivers/usb/gadget/function/f_uvc.c
+++ b/drivers/usb/gadget/function/f_uvc.c
@@ -29,6 +29,8 @@
#include "uvc_v4l2.h"
#include "uvc_video.h"
+#define USBDHDR(p) ((struct usb_descriptor_header *)(p))
+
unsigned int uvc_gadget_trace_param;
module_param_named(trace, uvc_gadget_trace_param, uint, 0644);
MODULE_PARM_DESC(trace, "Trace level bitmask");
@@ -181,19 +183,19 @@ static struct usb_ss_ep_comp_descriptor uvc_ss_streaming_comp = {
*/
};
-static const struct usb_descriptor_header * const uvc_fs_streaming[] = {
+static const struct usb_descriptor_header *uvc_fs_streaming[] = {
(struct usb_descriptor_header *) &uvc_streaming_intf_alt1,
(struct usb_descriptor_header *) &uvc_fs_streaming_ep,
NULL,
};
-static const struct usb_descriptor_header * const uvc_hs_streaming[] = {
+static const struct usb_descriptor_header *uvc_hs_streaming[] = {
(struct usb_descriptor_header *) &uvc_streaming_intf_alt1,
(struct usb_descriptor_header *) &uvc_hs_streaming_ep,
NULL,
};
-static const struct usb_descriptor_header * const uvc_ss_streaming[] = {
+static const struct usb_descriptor_header *uvc_ss_streaming[] = {
(struct usb_descriptor_header *) &uvc_streaming_intf_alt1,
(struct usb_descriptor_header *) &uvc_ss_streaming_ep,
(struct usb_descriptor_header *) &uvc_ss_streaming_comp,
@@ -204,6 +206,10 @@ static const struct usb_descriptor_header * const uvc_ss_streaming[] = {
* Control requests
*/
+
+static int uvc_function_set_alt(struct usb_function *f,
+ unsigned int interface, unsigned int alt);
+
static void
uvc_function_ep0_complete(struct usb_ep *ep, struct usb_request *req)
{
@@ -219,6 +225,13 @@ uvc_function_ep0_complete(struct usb_ep *ep, struct usb_request *req)
uvc_event->data.length = req->actual;
memcpy(&uvc_event->data.data, req->buf, req->actual);
v4l2_event_queue(&uvc->vdev, &v4l2_event);
+
+ /*
+ * Bulk mode only has one alt, so we should set STREAM ON after
+ * responding the SET UVC_VS_COMMIT_CONTROL request.
+ */
+ if (uvc->state == UVC_STATE_BULK_SETTING)
+ uvc_function_set_alt(&uvc->func, uvc->streaming_intf, 1);
}
}
@@ -228,6 +241,9 @@ uvc_function_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
struct uvc_device *uvc = to_uvc(f);
struct v4l2_event v4l2_event;
struct uvc_event *uvc_event = (void *)&v4l2_event.u.data;
+ struct f_uvc_opts *opts = fi_to_f_uvc_opts(f->fi);
+ unsigned int interface = le16_to_cpu(ctrl->wIndex) & 0xff;
+ unsigned int cs = le16_to_cpu(ctrl->wValue) >> 8 & 0xff;
if ((ctrl->bRequestType & USB_TYPE_MASK) != USB_TYPE_CLASS) {
uvcg_info(f, "invalid request type\n");
@@ -245,6 +261,21 @@ uvc_function_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
uvc->event_setup_out = !(ctrl->bRequestType & USB_DIR_IN);
uvc->event_length = le16_to_cpu(ctrl->wLength);
+ /*
+ * Bulk mode only has one alt, when the SET UVC_VS_COMMIT_CONTROL request
+ * is received, if the streaming is in transit, we need to set STREAM OFF,
+ * if the uvc state is UVC_STATE_BULK_WAITING, we only need to change it.
+ */
+ if (opts->streaming_transfer == USB_ENDPOINT_XFER_BULK &&
+ uvc->event_setup_out &&
+ uvc->streaming_intf == interface &&
+ cs == UVC_VS_COMMIT_CONTROL) {
+ if (uvc->state == UVC_STATE_STREAMING)
+ uvc_function_set_alt(&uvc->func, uvc->streaming_intf, 0);
+ else if (uvc->state == UVC_STATE_BULK_WAITING)
+ uvc->state = UVC_STATE_BULK_SETTING;
+ }
+
memset(&v4l2_event, 0, sizeof(v4l2_event));
v4l2_event.type = UVC_EVENT_SETUP;
memcpy(&uvc_event->req, ctrl, sizeof(uvc_event->req));
@@ -255,9 +286,12 @@ uvc_function_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
void uvc_function_setup_continue(struct uvc_device *uvc)
{
+ struct f_uvc_opts *opts = fi_to_f_uvc_opts(uvc->func.fi);
struct usb_composite_dev *cdev = uvc->func.config->cdev;
- usb_composite_setup_continue(cdev);
+ /* delayed_status in bulk mode is 0, so it doesn't need to continue. */
+ if (opts->streaming_transfer != USB_ENDPOINT_XFER_BULK)
+ usb_composite_setup_continue(cdev);
}
static int
@@ -282,6 +316,7 @@ uvc_function_set_alt(struct usb_function *f, unsigned interface, unsigned alt)
struct usb_composite_dev *cdev = f->config->cdev;
struct v4l2_event v4l2_event;
struct uvc_event *uvc_event = (void *)&v4l2_event.u.data;
+ struct f_uvc_opts *opts = fi_to_f_uvc_opts(f->fi);
int ret;
uvcg_info(f, "%s(%u, %u)\n", __func__, interface, alt);
@@ -314,15 +349,19 @@ uvc_function_set_alt(struct usb_function *f, unsigned interface, unsigned alt)
if (interface != uvc->streaming_intf)
return -EINVAL;
- /* TODO
- if (usb_endpoint_xfer_bulk(&uvc->desc.vs_ep))
- return alt ? -EINVAL : 0;
- */
-
switch (alt) {
case 0:
- if (uvc->state != UVC_STATE_STREAMING)
- return 0;
+ if (opts->streaming_transfer == USB_ENDPOINT_XFER_BULK) {
+ if (uvc->state == UVC_STATE_CONNECTED)
+ uvc->state = UVC_STATE_BULK_WAITING;
+ else if (uvc->state == UVC_STATE_STREAMING)
+ uvc->state = UVC_STATE_BULK_SETTING;
+ else
+ return 0;
+ } else {
+ if (uvc->state != UVC_STATE_STREAMING)
+ return 0;
+ }
if (uvc->video.ep)
usb_ep_disable(uvc->video.ep);
@@ -331,12 +370,19 @@ uvc_function_set_alt(struct usb_function *f, unsigned interface, unsigned alt)
v4l2_event.type = UVC_EVENT_STREAMOFF;
v4l2_event_queue(&uvc->vdev, &v4l2_event);
- uvc->state = UVC_STATE_CONNECTED;
+ if (opts->streaming_transfer != USB_ENDPOINT_XFER_BULK)
+ uvc->state = UVC_STATE_CONNECTED;
+
return 0;
case 1:
- if (uvc->state != UVC_STATE_CONNECTED)
- return 0;
+ if (opts->streaming_transfer == USB_ENDPOINT_XFER_BULK) {
+ if (uvc->state != UVC_STATE_BULK_SETTING)
+ return 0;
+ } else {
+ if (uvc->state != UVC_STATE_CONNECTED)
+ return 0;
+ }
if (!uvc->video.ep)
return -EINVAL;
@@ -598,62 +644,101 @@ uvc_function_bind(struct usb_configuration *c, struct usb_function *f)
unsigned int max_packet_size;
struct usb_ep *ep;
struct f_uvc_opts *opts;
+ int i = 0;
int ret = -EINVAL;
uvcg_info(f, "%s()\n", __func__);
opts = fi_to_f_uvc_opts(f->fi);
- /* Sanity check the streaming endpoint module parameters. */
- opts->streaming_interval = clamp(opts->streaming_interval, 1U, 16U);
- opts->streaming_maxpacket = clamp(opts->streaming_maxpacket, 1U, 3072U);
- opts->streaming_maxburst = min(opts->streaming_maxburst, 15U);
-
- /* For SS, wMaxPacketSize has to be 1024 if bMaxBurst is not 0 */
- if (opts->streaming_maxburst &&
- (opts->streaming_maxpacket % 1024) != 0) {
- opts->streaming_maxpacket = roundup(opts->streaming_maxpacket, 1024);
- uvcg_info(f, "overriding streaming_maxpacket to %d\n",
- opts->streaming_maxpacket);
- }
- /*
- * Fill in the FS/HS/SS Video Streaming specific descriptors from the
- * module parameters.
- *
- * NOTE: We assume that the user knows what they are doing and won't
- * give parameters that their UDC doesn't support.
- */
- if (opts->streaming_maxpacket <= 1024) {
- max_packet_mult = 1;
- max_packet_size = opts->streaming_maxpacket;
- } else if (opts->streaming_maxpacket <= 2048) {
- max_packet_mult = 2;
- max_packet_size = opts->streaming_maxpacket / 2;
+ /* Handle different transfer mode for stream endpoints */
+ if (opts->streaming_transfer == USB_ENDPOINT_XFER_BULK) {
+ uvc_fs_streaming_ep.bmAttributes = opts->streaming_transfer;
+ uvc_hs_streaming_ep.bmAttributes = uvc_fs_streaming_ep.bmAttributes;
+ uvc_ss_streaming_ep.bmAttributes = uvc_fs_streaming_ep.bmAttributes;
+
+ opts->streaming_maxburst = min(opts->streaming_maxburst, 15U);
+
+ if (opts->streaming_maxpacket % 1024 != 0) {
+ opts->streaming_maxpacket = roundup(opts->streaming_maxpacket, 1024);
+ uvcg_info(f, "overriding streaming_maxpacket to %d\n",
+ opts->streaming_maxpacket);
+ }
+
+ uvc_fs_streaming_ep.wMaxPacketSize = cpu_to_le16(64);
+ uvc_fs_streaming_ep.bInterval = 0;
+
+ uvc_hs_streaming_ep.wMaxPacketSize = cpu_to_le16(512);
+ uvc_hs_streaming_ep.bInterval = 0;
+
+ uvc_ss_streaming_ep.wMaxPacketSize = cpu_to_le16(1024);
+ uvc_ss_streaming_ep.bInterval = 0;
+
+ uvc_ss_streaming_comp.bmAttributes = 0;
+ uvc_ss_streaming_comp.bMaxBurst = opts->streaming_maxburst;
+ uvc_ss_streaming_comp.wBytesPerInterval = 0;
+
+ uvc->video.max_payload_size = opts->streaming_maxpacket;
} else {
- max_packet_mult = 3;
- max_packet_size = opts->streaming_maxpacket / 3;
- }
+ uvc_fs_streaming_ep.bmAttributes = opts->streaming_transfer;
+ uvc_hs_streaming_ep.bmAttributes = uvc_fs_streaming_ep.bmAttributes;
+ uvc_ss_streaming_ep.bmAttributes = uvc_fs_streaming_ep.bmAttributes;
+
+ /* Sanity check the streaming endpoint module parameters. */
+ opts->streaming_interval = clamp(opts->streaming_interval, 1U, 16U);
+ opts->streaming_maxpacket = clamp(opts->streaming_maxpacket, 1U, 3072U);
+ opts->streaming_maxburst = min(opts->streaming_maxburst, 15U);
+
+ /* For SS, wMaxPacketSize has to be 1024 if bMaxBurst is not 0 */
+ if (opts->streaming_maxburst &&
+ (opts->streaming_maxpacket % 1024) != 0) {
+ opts->streaming_maxpacket = roundup(opts->streaming_maxpacket, 1024);
+ uvcg_info(f, "overriding streaming_maxpacket to %d\n",
+ opts->streaming_maxpacket);
+ }
- uvc_fs_streaming_ep.wMaxPacketSize =
- cpu_to_le16(min(opts->streaming_maxpacket, 1023U));
- uvc_fs_streaming_ep.bInterval = opts->streaming_interval;
+ /*
+ * Fill in the FS/HS/SS Video Streaming specific descriptors from the
+ * module parameters.
+ *
+ * NOTE: We assume that the user knows what they are doing and won't
+ * give parameters that their UDC doesn't support.
+ */
+ if (opts->streaming_maxpacket <= 1024) {
+ max_packet_mult = 0;
+ max_packet_size = opts->streaming_maxpacket;
+ } else if (opts->streaming_maxpacket <= 2048) {
+ max_packet_mult = 1;
+ max_packet_size = opts->streaming_maxpacket / 2;
+ } else {
+ max_packet_mult = 2;
+ max_packet_size = opts->streaming_maxpacket / 3;
+ }
- uvc_hs_streaming_ep.wMaxPacketSize =
- cpu_to_le16(max_packet_size | ((max_packet_mult - 1) << 11));
+ uvc_fs_streaming_ep.wMaxPacketSize =
+ cpu_to_le16(min(opts->streaming_maxpacket, 1023U));
+ uvc_fs_streaming_ep.bInterval = opts->streaming_interval;
- /* A high-bandwidth endpoint must specify a bInterval value of 1 */
- if (max_packet_mult > 1)
- uvc_hs_streaming_ep.bInterval = 1;
- else
- uvc_hs_streaming_ep.bInterval = opts->streaming_interval;
+ uvc_hs_streaming_ep.wMaxPacketSize =
+ cpu_to_le16(max_packet_size | (max_packet_mult << 11));
+
+ /* A high-bandwidth endpoint must specify a bInterval value of 1 */
+ if (max_packet_mult > 0)
+ uvc_hs_streaming_ep.bInterval = 1;
+ else
+ uvc_hs_streaming_ep.bInterval = opts->streaming_interval;
+
+ uvc_ss_streaming_ep.wMaxPacketSize = cpu_to_le16(max_packet_size);
+ uvc_ss_streaming_ep.bInterval = opts->streaming_interval;
+
+ uvc_ss_streaming_comp.bmAttributes = max_packet_mult;
+ uvc_ss_streaming_comp.bMaxBurst = opts->streaming_maxburst;
+ uvc_ss_streaming_comp.wBytesPerInterval =
+ cpu_to_le16(max_packet_size * (max_packet_mult + 1) *
+ (opts->streaming_maxburst + 1));
- uvc_ss_streaming_ep.wMaxPacketSize = cpu_to_le16(max_packet_size);
- uvc_ss_streaming_ep.bInterval = opts->streaming_interval;
- uvc_ss_streaming_comp.bmAttributes = max_packet_mult - 1;
- uvc_ss_streaming_comp.bMaxBurst = opts->streaming_maxburst;
- uvc_ss_streaming_comp.wBytesPerInterval =
- cpu_to_le16(max_packet_size * max_packet_mult *
- (opts->streaming_maxburst + 1));
+ uvc->video.max_payload_size = 0;
+ }
/* Allocate endpoints. */
ep = usb_ep_autoconfig(cdev->gadget, &uvc_control_ep);
@@ -667,7 +752,7 @@ uvc_function_bind(struct usb_configuration *c, struct usb_function *f)
ep = usb_ep_autoconfig_ss(cdev->gadget, &uvc_ss_streaming_ep,
&uvc_ss_streaming_comp);
else if (gadget_is_dualspeed(cdev->gadget))
- ep = usb_ep_autoconfig(cdev->gadget, &uvc_hs_streaming_ep);
+ ep = usb_ep_autoconfig_ss(cdev->gadget, &uvc_hs_streaming_ep, NULL);
else
ep = usb_ep_autoconfig(cdev->gadget, &uvc_fs_streaming_ep);
@@ -709,6 +794,28 @@ uvc_function_bind(struct usb_configuration *c, struct usb_function *f)
uvc->streaming_intf = ret;
opts->streaming_interface = ret;
+ /* Handle different transfer mode for descriptors */
+ i = 0;
+ if (opts->streaming_transfer == USB_ENDPOINT_XFER_BULK) {
+ uvc_streaming_intf_alt0.bNumEndpoints = 1;
+ } else {
+ uvc_streaming_intf_alt0.bNumEndpoints = 0;
+
+ uvc_fs_streaming[i] = USBDHDR(&uvc_streaming_intf_alt1);
+ uvc_hs_streaming[i] = USBDHDR(&uvc_streaming_intf_alt1);
+ uvc_ss_streaming[i] = USBDHDR(&uvc_streaming_intf_alt1);
+ ++i;
+ }
+ uvc_fs_streaming[i] = USBDHDR(&uvc_fs_streaming_ep);
+ uvc_hs_streaming[i] = USBDHDR(&uvc_hs_streaming_ep);
+ uvc_ss_streaming[i] = USBDHDR(&uvc_ss_streaming_ep);
+ ++i;
+ uvc_fs_streaming[i] = NULL;
+ uvc_hs_streaming[i] = NULL;
+ uvc_ss_streaming[i] = USBDHDR(&uvc_ss_streaming_comp);
+ ++i;
+ uvc_ss_streaming[i] = NULL;
+
/* Copy descriptors */
f->fs_descriptors = uvc_copy_descriptors(uvc, USB_SPEED_FULL);
if (IS_ERR(f->fs_descriptors)) {
@@ -872,6 +979,7 @@ static struct usb_function_instance *uvc_alloc_inst(void)
opts->streaming_interval = 1;
opts->streaming_maxpacket = 1024;
+ opts->streaming_transfer = USB_ENDPOINT_SYNC_ASYNC | USB_ENDPOINT_XFER_ISOC;
snprintf(opts->function_name, sizeof(opts->function_name), "UVC Camera");
ret = uvcg_attach_configfs(opts);
diff --git a/drivers/usb/gadget/function/u_uvc.h b/drivers/usb/gadget/function/u_uvc.h
index 24b8681b0d6f..88cd235e0ea8 100644
--- a/drivers/usb/gadget/function/u_uvc.h
+++ b/drivers/usb/gadget/function/u_uvc.h
@@ -24,6 +24,7 @@ struct f_uvc_opts {
unsigned int streaming_interval;
unsigned int streaming_maxpacket;
unsigned int streaming_maxburst;
+ unsigned int streaming_transfer;
unsigned int control_interface;
unsigned int streaming_interface;
diff --git a/drivers/usb/gadget/function/uvc.h b/drivers/usb/gadget/function/uvc.h
index 40226b1f7e14..b00cba322643 100644
--- a/drivers/usb/gadget/function/uvc.h
+++ b/drivers/usb/gadget/function/uvc.h
@@ -123,6 +123,8 @@ enum uvc_state {
UVC_STATE_DISCONNECTED,
UVC_STATE_CONNECTED,
UVC_STATE_STREAMING,
+ UVC_STATE_BULK_WAITING,
+ UVC_STATE_BULK_SETTING,
};
struct uvc_device {
diff --git a/drivers/usb/gadget/function/uvc_configfs.c b/drivers/usb/gadget/function/uvc_configfs.c
index 4303a3283ba0..ef7c4f6630d4 100644
--- a/drivers/usb/gadget/function/uvc_configfs.c
+++ b/drivers/usb/gadget/function/uvc_configfs.c
@@ -2348,11 +2348,72 @@ end: \
UVC_ATTR(f_uvc_opts_, cname, cname)
UVCG_OPTS_ATTR(streaming_interval, streaming_interval, 16);
-UVCG_OPTS_ATTR(streaming_maxpacket, streaming_maxpacket, 3072);
+UVCG_OPTS_ATTR(streaming_maxpacket, streaming_maxpacket, 0x40000000U);
UVCG_OPTS_ATTR(streaming_maxburst, streaming_maxburst, 15);
#undef UVCG_OPTS_ATTR
+#define UVCG_OPTS_ATTR_TRANSFER(cname, aname) \
+static ssize_t f_uvc_opts_##cname##_show( \
+ struct config_item *item, char *page) \
+{ \
+ struct f_uvc_opts *opts = to_f_uvc_opts(item); \
+ int result; \
+ char *str; \
+ \
+ mutex_lock(&opts->lock); \
+ switch (opts->cname) { \
+ case USB_ENDPOINT_XFER_BULK: \
+ str = "bulk"; \
+ break; \
+ case USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC: \
+ str = "isoc"; \
+ break; \
+ default: \
+ str = "unknown"; \
+ break; \
+ } \
+ result = sprintf(page, "%s\n", str); \
+ mutex_unlock(&opts->lock); \
+ \
+ return result; \
+} \
+ \
+static ssize_t \
+f_uvc_opts_##cname##_store(struct config_item *item, \
+ const char *page, size_t len) \
+{ \
+ struct f_uvc_opts *opts = to_f_uvc_opts(item); \
+ int ret = 0; \
+ \
+ mutex_lock(&opts->lock); \
+ if (opts->refcnt) { \
+ ret = -EBUSY; \
+ goto end; \
+ } \
+ \
+ if (!strncmp(page, "bulk", 4)) \
+ opts->cname = USB_ENDPOINT_XFER_BULK; \
+ else if (!strncmp(page, "isoc", 4)) \
+ opts->cname = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC; \
+ else { \
+ ret = -EINVAL; \
+ goto end; \
+ } \
+ \
+ ret = len; \
+ \
+end: \
+ mutex_unlock(&opts->lock); \
+ return ret; \
+} \
+ \
+UVC_ATTR(f_uvc_opts_, cname, cname)
+
+UVCG_OPTS_ATTR_TRANSFER(streaming_transfer, streaming_transfer);
+
+#undef UVCG_OPTS_ATTR_TRANSFER
+
#define UVCG_OPTS_STRING_ATTR(cname, aname) \
static ssize_t f_uvc_opts_string_##cname##_show(struct config_item *item,\
char *page) \
@@ -2399,6 +2460,7 @@ static struct configfs_attribute *uvc_attrs[] = {
&f_uvc_opts_attr_streaming_interval,
&f_uvc_opts_attr_streaming_maxpacket,
&f_uvc_opts_attr_streaming_maxburst,
+ &f_uvc_opts_attr_streaming_transfer,
&f_uvc_opts_string_attr_function_name,
NULL,
};
diff --git a/drivers/usb/gadget/function/uvc_queue.c b/drivers/usb/gadget/function/uvc_queue.c
index 0aa3d7e1f3cc..2695b3ed29b5 100644
--- a/drivers/usb/gadget/function/uvc_queue.c
+++ b/drivers/usb/gadget/function/uvc_queue.c
@@ -54,9 +54,13 @@ static int uvc_queue_setup(struct vb2_queue *vq,
sizes[0] = video->imagesize;
- req_size = video->ep->maxpacket
- * max_t(unsigned int, video->ep->maxburst, 1)
- * (video->ep->mult);
+ /* Bulk mode uses max_payload_size as req_size */
+ if (video->max_payload_size)
+ req_size = video->max_payload_size;
+ else
+ req_size = video->ep->maxpacket
+ * max_t(unsigned int, video->ep->maxburst, 1)
+ * (video->ep->mult);
/* We divide by two, to increase the chance to run
* into fewer requests for smaller framesizes.
@@ -143,7 +147,9 @@ int uvcg_queue_init(struct uvc_video_queue *queue, struct device *dev, enum v4l2
queue->queue.buf_struct_size = sizeof(struct uvc_buffer);
queue->queue.ops = &uvc_queue_qops;
queue->queue.lock = lock;
- if (cdev->gadget->sg_supported) {
+
+ /* UDC supports scatter gather and transfer mode isn't bulk. */
+ if (cdev->gadget->sg_supported && !video->max_payload_size) {
queue->queue.mem_ops = &vb2_dma_sg_memops;
queue->use_sg = 1;
} else {
diff --git a/drivers/usb/gadget/function/uvc_video.c b/drivers/usb/gadget/function/uvc_video.c
index dd1c6b2ca7c6..70737340acfb 100644
--- a/drivers/usb/gadget/function/uvc_video.c
+++ b/drivers/usb/gadget/function/uvc_video.c
@@ -271,8 +271,10 @@ uvc_video_complete(struct usb_ep *ep, struct usb_request *req)
break;
default:
- uvcg_warn(&video->uvc->func,
- "VS request completed with status %d.\n",
+ if (uvc->state == UVC_STATE_BULK_WAITING ||
+ uvc->state == UVC_STATE_BULK_SETTING)
+ break;
+ uvcg_warn(&uvc->func, "VS request completed with status %d.\n",
req->status);
uvcg_queue_cancel(queue, 0);
}
@@ -328,9 +330,13 @@ uvc_video_alloc_requests(struct uvc_video *video)
BUG_ON(video->req_size);
- req_size = video->ep->maxpacket
- * max_t(unsigned int, video->ep->maxburst, 1)
- * (video->ep->mult);
+ /* Bulk mode uses max_payload_size as req_size */
+ if (video->max_payload_size)
+ req_size = video->max_payload_size;
+ else
+ req_size = video->ep->maxpacket
+ * max_t(unsigned int, video->ep->maxburst, 1)
+ * (video->ep->mult);
video->ureq = kcalloc(video->uvc_num_requests, sizeof(struct uvc_request), GFP_KERNEL);
if (video->ureq == NULL)
--
2.17.1
**********************************************************************
This email and attachments contain Ambarella Proprietary and/or Confidential Information and is intended solely for the use of the individual(s) to whom it is addressed. Any unauthorized review, use, disclosure, distribute, copy, or print is prohibited. If you are not an intended recipient, please contact the sender by reply email and destroy all copies of the original message. Thank you.
On Thu, Nov 03, 2022 at 02:13:03PM +0800, Jing Leng wrote:
> **********************************************************************
> This email and attachments contain Ambarella Proprietary and/or Confidential Information and is intended solely for the use of the individual(s) to whom it is addressed. Any unauthorized review, use, disclosure, distribute, copy, or print is prohibited. If you are not an intended recipient, please contact the sender by reply email and destroy all copies of the original message. Thank you.
Now deleted.
Hi Jing - thanks for the patch
On 03/11/2022 06:13, Jing Leng wrote:
> The video data endpoint of uvc can be implemented as either an
> isochronous or a bulk endpoint.
>
> The transmission speed of bulk mode is faster than isochronous mode.
> I tested the speed with cdns3 (USB 3.2 Gen1), it's difficult to reach
> 2 Gbps in the isochronous mode, and it can exceed 4 Gbps in the bulk
> mode.
>
> A VideoStreaming interface with isochronous endpoints must have alternate
> settings that can be used to change certain characteristics of the
> interface and underlying endpoint(s). A typical use of alternate settings
> is to provide a way to change the bandwidth requirements an active
> isochronous pipe imposes on the USB.
>
> A VideoStreaming interface containing a bulk endpoint for streaming shall
> support only alternate setting zero. Additional alternate settings
> containing bulk endpoints are not permitted in a device that is compliant
> with the Video Class specification.
>
> Here shows an example of the configfs differences:
> if [ $BULK -eq 1 ]; then
> echo "bulk" > functions/$FUNC/streaming_transfer
> echo $(( 1024 * N )) > functions/$FUNC/streaming_maxpacket
> else
> echo "isoc" > functions/$FUNC/streaming_transfer
> echo 1024 > functions/$FUNC/streaming_maxpacket
> fi
>
> Signed-off-by: Jing Leng <[email protected]>
> ---
> ChangeLog v4->v5:
> - Rebase the patch.
> - Make email addresses ('From' and 'Signed-off-by') consistent.
> ChangeLog v3->v4:
> - echo "bulk" > functions/$FUNC/streaming_transfer to set bulk mode
> ChangeLog v2->v3:
> - Mistakenly deleted the definition of i and USBDHDR when porting from my workdir.
> - Reported-by: kernel test robot <[email protected]>
> ChangeLog v1->v2:
> - Handle imagesize in uvc_v4l2_set_format. If it's not handled,
> - switching from low resolution to high resolution will fail to play.
> ---
> .../ABI/testing/configfs-usb-gadget-uvc | 8 +-
> Documentation/usb/gadget-testing.rst | 1 +
> drivers/usb/gadget/function/f_uvc.c | 228 +++++++++++++-----
> drivers/usb/gadget/function/u_uvc.h | 1 +
> drivers/usb/gadget/function/uvc.h | 2 +
> drivers/usb/gadget/function/uvc_configfs.c | 64 ++++-
> drivers/usb/gadget/function/uvc_queue.c | 14 +-
> drivers/usb/gadget/function/uvc_video.c | 16 +-
> 8 files changed, 261 insertions(+), 73 deletions(-)
>
> diff --git a/Documentation/ABI/testing/configfs-usb-gadget-uvc b/Documentation/ABI/testing/configfs-usb-gadget-uvc
> index 611b23e6488d..ffa2fd8c7fcd 100644
> --- a/Documentation/ABI/testing/configfs-usb-gadget-uvc
> +++ b/Documentation/ABI/testing/configfs-usb-gadget-uvc
> @@ -3,12 +3,14 @@ Date: Dec 2014
> KernelVersion: 4.0
> Description: UVC function directory
>
> - =================== =============================
> + =================== ===================================
> streaming_maxburst 0..15 (ss only)
> - streaming_maxpacket 1..1023 (fs), 1..3072 (hs/ss)
> + streaming_maxpacket isoc: 1..1023 (fs), 1..3072 (hs/ss)
> + bulk: 1024..0x40000000
I'm not really sure that I like this way of representing things, since
what you're setting with streaming_maxpacket here is not wMaxPacketSize
but the internal max_payload_size variable. I think that that's apt to
be quite confusing to people, since the possible values you've listed
disagree with the specs. It also precludes setting non-maximum values
for full-speed endpoints, which ought to be able to support 8, 16 and 32
bits too. I'd prefer another attribute / some other way of determining
the max_payload_size and full control over the bulk endpoint sizes
through streaming_maxpacket.
Also, might be worth bobbing another update onto
Documentation/usb/gadget-testing.rst
> streaming_interval 1..16
> + streaming_transfer isoc/bulk
> function_name string [32]
> - =================== =============================
> + =================== ===================================
>
> What: /config/usb-gadget/gadget/functions/uvc.name/control
> Date: Dec 2014
> diff --git a/Documentation/usb/gadget-testing.rst b/Documentation/usb/gadget-testing.rst
> index 2278c9ffb74a..880af56abe8b 100644
> --- a/Documentation/usb/gadget-testing.rst
> +++ b/Documentation/usb/gadget-testing.rst
> @@ -793,6 +793,7 @@ The uvc function provides these attributes in its function directory:
> streaming_maxpacket maximum packet size this endpoint is capable of
> sending or receiving when this configuration is
> selected
> + streaming_transfer specify data transmission mode (isoc/bulk)
> function_name name of the interface
> =================== ================================================
>
> diff --git a/drivers/usb/gadget/function/f_uvc.c b/drivers/usb/gadget/function/f_uvc.c
> index 6e196e06181e..8a4df750e00d 100644
> --- a/drivers/usb/gadget/function/f_uvc.c
> +++ b/drivers/usb/gadget/function/f_uvc.c
> @@ -29,6 +29,8 @@
> #include "uvc_v4l2.h"
> #include "uvc_video.h"
>
> +#define USBDHDR(p) ((struct usb_descriptor_header *)(p))
> +
> unsigned int uvc_gadget_trace_param;
> module_param_named(trace, uvc_gadget_trace_param, uint, 0644);
> MODULE_PARM_DESC(trace, "Trace level bitmask");
> @@ -181,19 +183,19 @@ static struct usb_ss_ep_comp_descriptor uvc_ss_streaming_comp = {
> */
> };
>
> -static const struct usb_descriptor_header * const uvc_fs_streaming[] = {
> +static const struct usb_descriptor_header *uvc_fs_streaming[] = {
> (struct usb_descriptor_header *) &uvc_streaming_intf_alt1,
> (struct usb_descriptor_header *) &uvc_fs_streaming_ep,
> NULL,
> };
>
> -static const struct usb_descriptor_header * const uvc_hs_streaming[] = {
> +static const struct usb_descriptor_header *uvc_hs_streaming[] = {
> (struct usb_descriptor_header *) &uvc_streaming_intf_alt1,
> (struct usb_descriptor_header *) &uvc_hs_streaming_ep,
> NULL,
> };
>
> -static const struct usb_descriptor_header * const uvc_ss_streaming[] = {
> +static const struct usb_descriptor_header *uvc_ss_streaming[] = {
> (struct usb_descriptor_header *) &uvc_streaming_intf_alt1,
> (struct usb_descriptor_header *) &uvc_ss_streaming_ep,
> (struct usb_descriptor_header *) &uvc_ss_streaming_comp,
> @@ -204,6 +206,10 @@ static const struct usb_descriptor_header * const uvc_ss_streaming[] = {
> * Control requests
> */
>
> +
> +static int uvc_function_set_alt(struct usb_function *f,
> + unsigned int interface, unsigned int alt);
> +
Can we just move the function definition here?
> static void
> uvc_function_ep0_complete(struct usb_ep *ep, struct usb_request *req)
> {
> @@ -219,6 +225,13 @@ uvc_function_ep0_complete(struct usb_ep *ep, struct usb_request *req)
> uvc_event->data.length = req->actual;
> memcpy(&uvc_event->data.data, req->buf, req->actual);
> v4l2_event_queue(&uvc->vdev, &v4l2_event);
> +
> + /*
> + * Bulk mode only has one alt, so we should set STREAM ON after
> + * responding the SET UVC_VS_COMMIT_CONTROL request.
> + */
> + if (uvc->state == UVC_STATE_BULK_SETTING)
> + uvc_function_set_alt(&uvc->func, uvc->streaming_intf, 1);
> }
> }
Given bulk mode only has one alt, perhaps it's better to add new
functions for stream on/off and call those (including in
uvc_function_set_alt()) to make it clear what's happening.
>
> @@ -228,6 +241,9 @@ uvc_function_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
> struct uvc_device *uvc = to_uvc(f);
> struct v4l2_event v4l2_event;
> struct uvc_event *uvc_event = (void *)&v4l2_event.u.data;
> + struct f_uvc_opts *opts = fi_to_f_uvc_opts(f->fi);
> + unsigned int interface = le16_to_cpu(ctrl->wIndex) & 0xff;
> + unsigned int cs = le16_to_cpu(ctrl->wValue) >> 8 & 0xff;
>
> if ((ctrl->bRequestType & USB_TYPE_MASK) != USB_TYPE_CLASS) {
> uvcg_info(f, "invalid request type\n");
> @@ -245,6 +261,21 @@ uvc_function_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
> uvc->event_setup_out = !(ctrl->bRequestType & USB_DIR_IN);
> uvc->event_length = le16_to_cpu(ctrl->wLength);
>
> + /*
> + * Bulk mode only has one alt, when the SET UVC_VS_COMMIT_CONTROL request
> + * is received, if the streaming is in transit, we need to set STREAM OFF,
> + * if the uvc state is UVC_STATE_BULK_WAITING, we only need to change it.
> + */
> + if (opts->streaming_transfer == USB_ENDPOINT_XFER_BULK &&
> + uvc->event_setup_out &&
> + uvc->streaming_intf == interface &&
> + cs == UVC_VS_COMMIT_CONTROL) {
> + if (uvc->state == UVC_STATE_STREAMING)
> + uvc_function_set_alt(&uvc->func, uvc->streaming_intf, 0);
> + else if (uvc->state == UVC_STATE_BULK_WAITING)
> + uvc->state = UVC_STATE_BULK_SETTING;
> + }
As far as I can tell this path doesn't quite work out; when I test the
code I don't get uvc_function_set_alt(1, 0) being called, so the
streamoff isn't happening correctly when in bulk mode.
uvc_video_stop_streaming() in drivers/media/usb/uvc/uvc_video.c has this
comment:
/*
* UVC doesn't specify how to inform a bulk-based device
* when the video stream is stopped. Windows sends a
* CLEAR_FEATURE(HALT) request to the video streaming
* bulk endpoint, mimic the same behaviour.
*/
Perhaps it would be good to accommodate that method?
> +
> memset(&v4l2_event, 0, sizeof(v4l2_event));
> v4l2_event.type = UVC_EVENT_SETUP;
> memcpy(&uvc_event->req, ctrl, sizeof(uvc_event->req));
> @@ -255,9 +286,12 @@ uvc_function_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
>
> void uvc_function_setup_continue(struct uvc_device *uvc)
> {
> + struct f_uvc_opts *opts = fi_to_f_uvc_opts(uvc->func.fi);
> struct usb_composite_dev *cdev = uvc->func.config->cdev;
>
> - usb_composite_setup_continue(cdev);
> + /* delayed_status in bulk mode is 0, so it doesn't need to continue. */
> + if (opts->streaming_transfer != USB_ENDPOINT_XFER_BULK)
> + usb_composite_setup_continue(cdev);
> }
>
> static int
> @@ -282,6 +316,7 @@ uvc_function_set_alt(struct usb_function *f, unsigned interface, unsigned alt)
> struct usb_composite_dev *cdev = f->config->cdev;
> struct v4l2_event v4l2_event;
> struct uvc_event *uvc_event = (void *)&v4l2_event.u.data;
> + struct f_uvc_opts *opts = fi_to_f_uvc_opts(f->fi);
> int ret;
>
> uvcg_info(f, "%s(%u, %u)\n", __func__, interface, alt);
> @@ -314,15 +349,19 @@ uvc_function_set_alt(struct usb_function *f, unsigned interface, unsigned alt)
> if (interface != uvc->streaming_intf)
> return -EINVAL;
>
> - /* TODO
> - if (usb_endpoint_xfer_bulk(&uvc->desc.vs_ep))
> - return alt ? -EINVAL : 0;
> - */
I think this probably should stay (uncommented) to be strictly
compliant, with the other changes to this function moved to stream
on/off functions.
> -
> switch (alt) {
> case 0:
> - if (uvc->state != UVC_STATE_STREAMING)
> - return 0;
> + if (opts->streaming_transfer == USB_ENDPOINT_XFER_BULK) {
> + if (uvc->state == UVC_STATE_CONNECTED)
> + uvc->state = UVC_STATE_BULK_WAITING;
> + else if (uvc->state == UVC_STATE_STREAMING)
> + uvc->state = UVC_STATE_BULK_SETTING;
> + else
> + return 0;
> + } else {
> + if (uvc->state != UVC_STATE_STREAMING)
> + return 0;
> + }
>
> if (uvc->video.ep)
> usb_ep_disable(uvc->video.ep);
> @@ -331,12 +370,19 @@ uvc_function_set_alt(struct usb_function *f, unsigned interface, unsigned alt)
> v4l2_event.type = UVC_EVENT_STREAMOFF;
> v4l2_event_queue(&uvc->vdev, &v4l2_event);
>
> - uvc->state = UVC_STATE_CONNECTED;
> + if (opts->streaming_transfer != USB_ENDPOINT_XFER_BULK)
> + uvc->state = UVC_STATE_CONNECTED;
> +
> return 0;
>
> case 1:
> - if (uvc->state != UVC_STATE_CONNECTED)
> - return 0;
> + if (opts->streaming_transfer == USB_ENDPOINT_XFER_BULK) {
> + if (uvc->state != UVC_STATE_BULK_SETTING)
> + return 0;
> + } else {
> + if (uvc->state != UVC_STATE_CONNECTED)
> + return 0;
> + }
>
> if (!uvc->video.ep)
> return -EINVAL;
> @@ -598,62 +644,101 @@ uvc_function_bind(struct usb_configuration *c, struct usb_function *f)
> unsigned int max_packet_size;
> struct usb_ep *ep;
> struct f_uvc_opts *opts;
> + int i = 0;
> int ret = -EINVAL;
>
> uvcg_info(f, "%s()\n", __func__);
>
> opts = fi_to_f_uvc_opts(f->fi);
> - /* Sanity check the streaming endpoint module parameters. */
> - opts->streaming_interval = clamp(opts->streaming_interval, 1U, 16U);
> - opts->streaming_maxpacket = clamp(opts->streaming_maxpacket, 1U, 3072U);
> - opts->streaming_maxburst = min(opts->streaming_maxburst, 15U);
> -
> - /* For SS, wMaxPacketSize has to be 1024 if bMaxBurst is not 0 */
> - if (opts->streaming_maxburst &&
> - (opts->streaming_maxpacket % 1024) != 0) {
> - opts->streaming_maxpacket = roundup(opts->streaming_maxpacket, 1024);
> - uvcg_info(f, "overriding streaming_maxpacket to %d\n",
> - opts->streaming_maxpacket);
> - }
>
> - /*
> - * Fill in the FS/HS/SS Video Streaming specific descriptors from the
> - * module parameters.
> - *
> - * NOTE: We assume that the user knows what they are doing and won't
> - * give parameters that their UDC doesn't support.
> - */
> - if (opts->streaming_maxpacket <= 1024) {
> - max_packet_mult = 1;
> - max_packet_size = opts->streaming_maxpacket;
> - } else if (opts->streaming_maxpacket <= 2048) {
> - max_packet_mult = 2;
> - max_packet_size = opts->streaming_maxpacket / 2;
> + /* Handle different transfer mode for stream endpoints */
> + if (opts->streaming_transfer == USB_ENDPOINT_XFER_BULK) {
> + uvc_fs_streaming_ep.bmAttributes = opts->streaming_transfer;
> + uvc_hs_streaming_ep.bmAttributes = uvc_fs_streaming_ep.bmAttributes;
> + uvc_ss_streaming_ep.bmAttributes = uvc_fs_streaming_ep.bmAttributes;
> +
> + opts->streaming_maxburst = min(opts->streaming_maxburst, 15U);
> +
> + if (opts->streaming_maxpacket % 1024 != 0) {
> + opts->streaming_maxpacket = roundup(opts->streaming_maxpacket, 1024);
> + uvcg_info(f, "overriding streaming_maxpacket to %d\n",
> + opts->streaming_maxpacket);
> + }
> +
> + uvc_fs_streaming_ep.wMaxPacketSize = cpu_to_le16(64);
> + uvc_fs_streaming_ep.bInterval = 0;
> +
> + uvc_hs_streaming_ep.wMaxPacketSize = cpu_to_le16(512);
> + uvc_hs_streaming_ep.bInterval = 0;
> +
> + uvc_ss_streaming_ep.wMaxPacketSize = cpu_to_le16(1024);
> + uvc_ss_streaming_ep.bInterval = 0;
> +
As I say, I think that these ought to be set by streaming_maxpacket
> + uvc_ss_streaming_comp.bmAttributes = 0;
> + uvc_ss_streaming_comp.bMaxBurst = opts->streaming_maxburst;
> + uvc_ss_streaming_comp.wBytesPerInterval = 0;
> +
> + uvc->video.max_payload_size = opts->streaming_maxpacket;
> } else {
> - max_packet_mult = 3;
> - max_packet_size = opts->streaming_maxpacket / 3;
> - }
> + uvc_fs_streaming_ep.bmAttributes = opts->streaming_transfer;
> + uvc_hs_streaming_ep.bmAttributes = uvc_fs_streaming_ep.bmAttributes;
> + uvc_ss_streaming_ep.bmAttributes = uvc_fs_streaming_ep.bmAttributes;
> +
> + /* Sanity check the streaming endpoint module parameters. */
> + opts->streaming_interval = clamp(opts->streaming_interval, 1U, 16U);
> + opts->streaming_maxpacket = clamp(opts->streaming_maxpacket, 1U, 3072U);
> + opts->streaming_maxburst = min(opts->streaming_maxburst, 15U);
> +
> + /* For SS, wMaxPacketSize has to be 1024 if bMaxBurst is not 0 */
> + if (opts->streaming_maxburst &&
> + (opts->streaming_maxpacket % 1024) != 0) {
> + opts->streaming_maxpacket = roundup(opts->streaming_maxpacket, 1024);
> + uvcg_info(f, "overriding streaming_maxpacket to %d\n",
> + opts->streaming_maxpacket);
> + }
>
> - uvc_fs_streaming_ep.wMaxPacketSize =
> - cpu_to_le16(min(opts->streaming_maxpacket, 1023U));
> - uvc_fs_streaming_ep.bInterval = opts->streaming_interval;
> + /*
> + * Fill in the FS/HS/SS Video Streaming specific descriptors from the
> + * module parameters.
> + *
> + * NOTE: We assume that the user knows what they are doing and won't
> + * give parameters that their UDC doesn't support.
> + */
> + if (opts->streaming_maxpacket <= 1024) {
> + max_packet_mult = 0;
> + max_packet_size = opts->streaming_maxpacket;
> + } else if (opts->streaming_maxpacket <= 2048) {
> + max_packet_mult = 1;
> + max_packet_size = opts->streaming_maxpacket / 2;
> + } else {
> + max_packet_mult = 2;
> + max_packet_size = opts->streaming_maxpacket / 3;
> + }
>
> - uvc_hs_streaming_ep.wMaxPacketSize =
> - cpu_to_le16(max_packet_size | ((max_packet_mult - 1) << 11));
> + uvc_fs_streaming_ep.wMaxPacketSize =
> + cpu_to_le16(min(opts->streaming_maxpacket, 1023U));
> + uvc_fs_streaming_ep.bInterval = opts->streaming_interval;
>
> - /* A high-bandwidth endpoint must specify a bInterval value of 1 */
> - if (max_packet_mult > 1)
> - uvc_hs_streaming_ep.bInterval = 1;
> - else
> - uvc_hs_streaming_ep.bInterval = opts->streaming_interval;
> + uvc_hs_streaming_ep.wMaxPacketSize =
> + cpu_to_le16(max_packet_size | (max_packet_mult << 11));
> +
> + /* A high-bandwidth endpoint must specify a bInterval value of 1 */
> + if (max_packet_mult > 0)
> + uvc_hs_streaming_ep.bInterval = 1;
> + else
> + uvc_hs_streaming_ep.bInterval = opts->streaming_interval;
> +
> + uvc_ss_streaming_ep.wMaxPacketSize = cpu_to_le16(max_packet_size);
> + uvc_ss_streaming_ep.bInterval = opts->streaming_interval;
> +
Unneeded blank line
> + uvc_ss_streaming_comp.bmAttributes = max_packet_mult;
> + uvc_ss_streaming_comp.bMaxBurst = opts->streaming_maxburst;
> + uvc_ss_streaming_comp.wBytesPerInterval =
> + cpu_to_le16(max_packet_size * (max_packet_mult + 1) *
> + (opts->streaming_maxburst + 1));
>
> - uvc_ss_streaming_ep.wMaxPacketSize = cpu_to_le16(max_packet_size);
> - uvc_ss_streaming_ep.bInterval = opts->streaming_interval;
> - uvc_ss_streaming_comp.bmAttributes = max_packet_mult - 1;
> - uvc_ss_streaming_comp.bMaxBurst = opts->streaming_maxburst;
> - uvc_ss_streaming_comp.wBytesPerInterval =
> - cpu_to_le16(max_packet_size * max_packet_mult *
> - (opts->streaming_maxburst + 1));
> + uvc->video.max_payload_size = 0;
> + }
>
> /* Allocate endpoints. */
> ep = usb_ep_autoconfig(cdev->gadget, &uvc_control_ep);
> @@ -667,7 +752,7 @@ uvc_function_bind(struct usb_configuration *c, struct usb_function *f)
> ep = usb_ep_autoconfig_ss(cdev->gadget, &uvc_ss_streaming_ep,
> &uvc_ss_streaming_comp);
> else if (gadget_is_dualspeed(cdev->gadget))
> - ep = usb_ep_autoconfig(cdev->gadget, &uvc_hs_streaming_ep);
> + ep = usb_ep_autoconfig_ss(cdev->gadget, &uvc_hs_streaming_ep, NULL);
This doesn't seem right.
> else
> ep = usb_ep_autoconfig(cdev->gadget, &uvc_fs_streaming_ep);
>
> @@ -709,6 +794,28 @@ uvc_function_bind(struct usb_configuration *c, struct usb_function *f)
> uvc->streaming_intf = ret;
> opts->streaming_interface = ret;
>
> + /* Handle different transfer mode for descriptors */
> + i = 0;
> + if (opts->streaming_transfer == USB_ENDPOINT_XFER_BULK) {
> + uvc_streaming_intf_alt0.bNumEndpoints = 1;
> + } else {
> + uvc_streaming_intf_alt0.bNumEndpoints = 0;
> +
> + uvc_fs_streaming[i] = USBDHDR(&uvc_streaming_intf_alt1);
> + uvc_hs_streaming[i] = USBDHDR(&uvc_streaming_intf_alt1);
> + uvc_ss_streaming[i] = USBDHDR(&uvc_streaming_intf_alt1);
> + ++i;
> + }
> + uvc_fs_streaming[i] = USBDHDR(&uvc_fs_streaming_ep);
> + uvc_hs_streaming[i] = USBDHDR(&uvc_hs_streaming_ep);
> + uvc_ss_streaming[i] = USBDHDR(&uvc_ss_streaming_ep);
> + ++i;
> + uvc_fs_streaming[i] = NULL;
> + uvc_hs_streaming[i] = NULL;
> + uvc_ss_streaming[i] = USBDHDR(&uvc_ss_streaming_comp);
> + ++i;
> + uvc_ss_streaming[i] = NULL;
> +
> /* Copy descriptors */
> f->fs_descriptors = uvc_copy_descriptors(uvc, USB_SPEED_FULL);
> if (IS_ERR(f->fs_descriptors)) {
> @@ -872,6 +979,7 @@ static struct usb_function_instance *uvc_alloc_inst(void)
>
> opts->streaming_interval = 1;
> opts->streaming_maxpacket = 1024;
> + opts->streaming_transfer = USB_ENDPOINT_SYNC_ASYNC | USB_ENDPOINT_XFER_ISOC;
> snprintf(opts->function_name, sizeof(opts->function_name), "UVC Camera");
>
> ret = uvcg_attach_configfs(opts);
> diff --git a/drivers/usb/gadget/function/u_uvc.h b/drivers/usb/gadget/function/u_uvc.h
> index 24b8681b0d6f..88cd235e0ea8 100644
> --- a/drivers/usb/gadget/function/u_uvc.h
> +++ b/drivers/usb/gadget/function/u_uvc.h
> @@ -24,6 +24,7 @@ struct f_uvc_opts {
> unsigned int streaming_interval;
> unsigned int streaming_maxpacket;
> unsigned int streaming_maxburst;
> + unsigned int streaming_transfer;
>
> unsigned int control_interface;
> unsigned int streaming_interface;
> diff --git a/drivers/usb/gadget/function/uvc.h b/drivers/usb/gadget/function/uvc.h
> index 40226b1f7e14..b00cba322643 100644
> --- a/drivers/usb/gadget/function/uvc.h
> +++ b/drivers/usb/gadget/function/uvc.h
> @@ -123,6 +123,8 @@ enum uvc_state {
> UVC_STATE_DISCONNECTED,
> UVC_STATE_CONNECTED,
> UVC_STATE_STREAMING,
> + UVC_STATE_BULK_WAITING,
> + UVC_STATE_BULK_SETTING,
> };
>
> struct uvc_device {
I think it's worth splitting the new configfs attribute at least into a
separate patch - this combined one does a lot.
> diff --git a/drivers/usb/gadget/function/uvc_configfs.c b/drivers/usb/gadget/function/uvc_configfs.c
> index 4303a3283ba0..ef7c4f6630d4 100644
> --- a/drivers/usb/gadget/function/uvc_configfs.c
> +++ b/drivers/usb/gadget/function/uvc_configfs.c
> @@ -2348,11 +2348,72 @@ end: \
> UVC_ATTR(f_uvc_opts_, cname, cname)
>
> UVCG_OPTS_ATTR(streaming_interval, streaming_interval, 16);
> -UVCG_OPTS_ATTR(streaming_maxpacket, streaming_maxpacket, 3072);
> +UVCG_OPTS_ATTR(streaming_maxpacket, streaming_maxpacket, 0x40000000U);
> UVCG_OPTS_ATTR(streaming_maxburst, streaming_maxburst, 15);
>
> #undef UVCG_OPTS_ATTR
>
> +#define UVCG_OPTS_ATTR_TRANSFER(cname, aname) \
> +static ssize_t f_uvc_opts_##cname##_show( \
> + struct config_item *item, char *page) \
> +{ \
> + struct f_uvc_opts *opts = to_f_uvc_opts(item); \
> + int result; \
> + char *str; \
> + \
> + mutex_lock(&opts->lock); \
> + switch (opts->cname) { \
> + case USB_ENDPOINT_XFER_BULK: \
> + str = "bulk"; \
> + break; \
> + case USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC: \
> + str = "isoc"; \
> + break; \
> + default: \
> + str = "unknown"; \
> + break; \
> + } \
> + result = sprintf(page, "%s\n", str); \
> + mutex_unlock(&opts->lock); \
> + \
> + return result; \
> +} \
> + \
> +static ssize_t \
> +f_uvc_opts_##cname##_store(struct config_item *item, \
> + const char *page, size_t len) \
> +{ \
> + struct f_uvc_opts *opts = to_f_uvc_opts(item); \
> + int ret = 0; \
> + \
> + mutex_lock(&opts->lock); \
> + if (opts->refcnt) { \
> + ret = -EBUSY; \
> + goto end; \
> + } \
> + \
> + if (!strncmp(page, "bulk", 4)) \
> + opts->cname = USB_ENDPOINT_XFER_BULK; \
> + else if (!strncmp(page, "isoc", 4)) \
> + opts->cname = USB_ENDPOINT_XFER_ISOC | USB_ENDPOINT_SYNC_ASYNC; \
> + else { \
> + ret = -EINVAL; \
> + goto end; \
> + } \
> + \
> + ret = len; \
> + \
> +end: \
> + mutex_unlock(&opts->lock); \
> + return ret; \
> +} \
> + \
> +UVC_ATTR(f_uvc_opts_, cname, cname)
> +
> +UVCG_OPTS_ATTR_TRANSFER(streaming_transfer, streaming_transfer);
Is it worth the macro for a single attribute? Particularly since the
set/store is too specific for it to be reusable in the future anyway. I
think I'd just write the bare function.
> +
> +#undef UVCG_OPTS_ATTR_TRANSFER
> +
> #define UVCG_OPTS_STRING_ATTR(cname, aname) \
> static ssize_t f_uvc_opts_string_##cname##_show(struct config_item *item,\
> char *page) \
> @@ -2399,6 +2460,7 @@ static struct configfs_attribute *uvc_attrs[] = {
> &f_uvc_opts_attr_streaming_interval,
> &f_uvc_opts_attr_streaming_maxpacket,
> &f_uvc_opts_attr_streaming_maxburst,
> + &f_uvc_opts_attr_streaming_transfer,
> &f_uvc_opts_string_attr_function_name,
> NULL,
> };
> diff --git a/drivers/usb/gadget/function/uvc_queue.c b/drivers/usb/gadget/function/uvc_queue.c
> index 0aa3d7e1f3cc..2695b3ed29b5 100644
> --- a/drivers/usb/gadget/function/uvc_queue.c
> +++ b/drivers/usb/gadget/function/uvc_queue.c
> @@ -54,9 +54,13 @@ static int uvc_queue_setup(struct vb2_queue *vq,
>
> sizes[0] = video->imagesize;
>
> - req_size = video->ep->maxpacket
> - * max_t(unsigned int, video->ep->maxburst, 1)
> - * (video->ep->mult);
> + /* Bulk mode uses max_payload_size as req_size */
> + if (video->max_payload_size)
> + req_size = video->max_payload_size;
> + else
> + req_size = video->ep->maxpacket
> + * max_t(unsigned int, video->ep->maxburst, 1)
> + * (video->ep->mult);
>
> /* We divide by two, to increase the chance to run
> * into fewer requests for smaller framesizes.
> @@ -143,7 +147,9 @@ int uvcg_queue_init(struct uvc_video_queue *queue, struct device *dev, enum v4l2
> queue->queue.buf_struct_size = sizeof(struct uvc_buffer);
> queue->queue.ops = &uvc_queue_qops;
> queue->queue.lock = lock;
> - if (cdev->gadget->sg_supported) {
> +
> + /* UDC supports scatter gather and transfer mode isn't bulk. */
> + if (cdev->gadget->sg_supported && !video->max_payload_size) {
> queue->queue.mem_ops = &vb2_dma_sg_memops;
> queue->use_sg = 1;
> } else {
> diff --git a/drivers/usb/gadget/function/uvc_video.c b/drivers/usb/gadget/function/uvc_video.c
> index dd1c6b2ca7c6..70737340acfb 100644
> --- a/drivers/usb/gadget/function/uvc_video.c
> +++ b/drivers/usb/gadget/function/uvc_video.c
> @@ -271,8 +271,10 @@ uvc_video_complete(struct usb_ep *ep, struct usb_request *req)
> break;
>
> default:
> - uvcg_warn(&video->uvc->func,
> - "VS request completed with status %d.\n",
> + if (uvc->state == UVC_STATE_BULK_WAITING ||
> + uvc->state == UVC_STATE_BULK_SETTING)
> + break;
> + uvcg_warn(&uvc->func, "VS request completed with status %d.\n",
> req->status);
> uvcg_queue_cancel(queue, 0);
> }
> @@ -328,9 +330,13 @@ uvc_video_alloc_requests(struct uvc_video *video)
>
> BUG_ON(video->req_size);
>
> - req_size = video->ep->maxpacket
> - * max_t(unsigned int, video->ep->maxburst, 1)
> - * (video->ep->mult);
> + /* Bulk mode uses max_payload_size as req_size */
> + if (video->max_payload_size)
> + req_size = video->max_payload_size;
> + else
> + req_size = video->ep->maxpacket
> + * max_t(unsigned int, video->ep->maxburst, 1)
> + * (video->ep->mult);
>
> video->ureq = kcalloc(video->uvc_num_requests, sizeof(struct uvc_request), GFP_KERNEL);
> if (video->ureq == NULL)
Hi Dan Scally,
>> - =================== =============================
>> + =================== ===================================
>> streaming_maxburst 0..15 (ss only)
>> - streaming_maxpacket 1..1023 (fs), 1..3072 (hs/ss)
>> + streaming_maxpacket isoc: 1..1023 (fs), 1..3072 (hs/ss)
>> + bulk: 1024..0x40000000
>
>
>I'm not really sure that I like this way of representing things, since what you're setting with streaming_maxpacket here is not wMaxPacketSize but the internal max_payload_size variable. I think that that's apt to be quite confusing to people, since the possible values you've listed disagree with the specs. It also precludes setting non-maximum values for full-speed endpoints, which ought to be able to support 8, 16 and 32 bits too. I'd prefer another attribute / some other way of determining the max_payload_size and full control over the bulk endpoint sizes through streaming_maxpacket.
UVC requires high bandwidth, so we'd better give the maximum wMaxPacketSize for full-speed ep.
And wMaxPacketSize of bulk ep is a fixed value in high-speed and supper-speed, so if we use streaming_maxpacket to set wMaxPacketSize for bulk ep, it not a good idea.
If we respond to UVC_SC_VIDEOSTREAMING request, we should set max_payload_size to dwMaxPayloadTransferSize in bulk mode, Reusing streaming_maxpacket keeps setting dwMaxPayloadTransferSize uniform in bulk mode and isoc mode.
>> static void
>> uvc_function_ep0_complete(struct usb_ep *ep, struct usb_request *req)
>> {
>> @@ -219,6 +225,13 @@ uvc_function_ep0_complete(struct usb_ep *ep, struct usb_request *req)
>> uvc_event->data.length = req->actual;
>> memcpy(&uvc_event->data.data, req->buf, req->actual);
>> v4l2_event_queue(&uvc->vdev, &v4l2_event);
>> +
>> + /*
>> + * Bulk mode only has one alt, so we should set STREAM ON after
>> + * responding the SET UVC_VS_COMMIT_CONTROL request.
>> + */
>> + if (uvc->state == UVC_STATE_BULK_SETTING)
>> + uvc_function_set_alt(&uvc->func, uvc->streaming_intf, 1);
>> }
>> }
>
>
>Given bulk mode only has one alt, perhaps it's better to add new functions for stream on/off and call those (including in
>uvc_function_set_alt()) to make it clear what's happening.
UVC will set 'alt 0' when be configured, not only in the SET UVC_VS_COMMIT_CONTROL request added by me.
>>
>> @@ -228,6 +241,9 @@ uvc_function_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
>> struct uvc_device *uvc = to_uvc(f);
>> struct v4l2_event v4l2_event;
>> struct uvc_event *uvc_event = (void *)&v4l2_event.u.data;
>> + struct f_uvc_opts *opts = fi_to_f_uvc_opts(f->fi);
>> + unsigned int interface = le16_to_cpu(ctrl->wIndex) & 0xff;
>> + unsigned int cs = le16_to_cpu(ctrl->wValue) >> 8 & 0xff;
>>
>> if ((ctrl->bRequestType & USB_TYPE_MASK) != USB_TYPE_CLASS) {
>> uvcg_info(f, "invalid request type\n"); @@ -245,6 +261,21 @@
>> uvc_function_setup(struct usb_function *f, const struct usb_ctrlrequest *ctrl)
>> uvc->event_setup_out = !(ctrl->bRequestType & USB_DIR_IN);
>> uvc->event_length = le16_to_cpu(ctrl->wLength);
>>
>> + /*
>> + * Bulk mode only has one alt, when the SET UVC_VS_COMMIT_CONTROL request
>> + * is received, if the streaming is in transit, we need to set STREAM OFF,
>> + * if the uvc state is UVC_STATE_BULK_WAITING, we only need to change it.
>> + */
>> + if (opts->streaming_transfer == USB_ENDPOINT_XFER_BULK &&
>> + uvc->event_setup_out &&
>> + uvc->streaming_intf == interface &&
>> + cs == UVC_VS_COMMIT_CONTROL) {
>> + if (uvc->state == UVC_STATE_STREAMING)
>> + uvc_function_set_alt(&uvc->func, uvc->streaming_intf, 0);
>> + else if (uvc->state == UVC_STATE_BULK_WAITING)
>> + uvc->state = UVC_STATE_BULK_SETTING;
>> + }
>
>
>As far as I can tell this path doesn't quite work out; when I test the code I don't get uvc_function_set_alt(1, 0) being called, so the streamoff isn't happening correctly when in bulk mode.
uvc_video_stop_streaming() in drivers/media/usb/uvc/uvc_video.c has this
comment:
UVC will set 'alt 0' when be configured, so the first play will execute 'uvc->state = UVC_STATE_BULK_SETTING', and 'alt 0' will be executed when replaying.
So I add these logics in uvc_function_setup and uvc_function_ep0_complete.
>/*
>* UVC doesn't specify how to inform a bulk-based device
>* when the video stream is stopped. Windows sends a
>* CLEAR_FEATURE(HALT) request to the video streaming
>* bulk endpoint, mimic the same behaviour.
>*/
>
>Perhaps it would be good to accommodate that method?
I test uvc on Windows 10 (PotPlayer) and Ubuntu 20.04 (v4l2-ctl) with cdnsp UDC, composite_setup doesn't recieve a CLEAR_FEATURE request when replaying, See the following print info:
[ 764.069697] composite_setup: 21 1 100 1 1a
[ 764.069914] composite_setup: a1 82 100 1 1a
[ 764.070088] composite_setup: a1 83 100 1 1a
[ 764.070389] composite_setup: 21 1 100 1 1a
[ 764.070552] composite_setup: a1 81 100 1 1a
[ 764.072136] composite_setup: 21 1 200 1 1a
[ 764.072141] configfs-gadget gadget: uvc: uvc_function_set_alt(1, 0)
[ 765.057620] configfs-gadget gadget: uvc: uvc_function_set_alt(1, 1)
[ 765.063911] configfs-gadget gadget: uvc: reset UVC
[ 767.094115] composite_setup: 21 1 100 1 1a
[ 767.094321] composite_setup: a1 82 100 1 1a
[ 767.094502] composite_setup: a1 83 100 1 1a
[ 767.094683] composite_setup: 21 1 100 1 1a
[ 767.094864] composite_setup: a1 81 100 1 1a
[ 767.096469] composite_setup: 21 1 200 1 1a
[ 767.096475] configfs-gadget gadget: uvc: uvc_function_set_alt(1, 0)
[ 768.082019] configfs-gadget gadget: uvc: uvc_function_set_alt(1, 1)
[ 768.088310] configfs-gadget gadget: uvc: reset UVC
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