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path: root/drivers/media/video/gspca/gspca.c
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Diffstat (limited to 'drivers/media/video/gspca/gspca.c')
-rw-r--r--drivers/media/video/gspca/gspca.c73
1 files changed, 49 insertions, 24 deletions
diff --git a/drivers/media/video/gspca/gspca.c b/drivers/media/video/gspca/gspca.c
index 2ca10dfec91..ca5a2b139d0 100644
--- a/drivers/media/video/gspca/gspca.c
+++ b/drivers/media/video/gspca/gspca.c
@@ -633,23 +633,32 @@ static u32 which_bandwidth(struct gspca_dev *gspca_dev)
u32 bandwidth;
int i;
+ /* get the (max) image size */
i = gspca_dev->curr_mode;
bandwidth = gspca_dev->cam.cam_mode[i].sizeimage;
- /* if the image is compressed, estimate the mean image size */
- if (bandwidth < gspca_dev->cam.cam_mode[i].width *
+ /* if the image is compressed, estimate its mean size */
+ if (!gspca_dev->cam.needs_full_bandwidth &&
+ bandwidth < gspca_dev->cam.cam_mode[i].width *
gspca_dev->cam.cam_mode[i].height)
- bandwidth /= 3;
+ bandwidth = bandwidth * 3 / 8; /* 0.375 */
/* estimate the frame rate */
if (gspca_dev->sd_desc->get_streamparm) {
struct v4l2_streamparm parm;
- parm.parm.capture.timeperframe.denominator = 15;
gspca_dev->sd_desc->get_streamparm(gspca_dev, &parm);
bandwidth *= parm.parm.capture.timeperframe.denominator;
+ bandwidth /= parm.parm.capture.timeperframe.numerator;
} else {
- bandwidth *= 15; /* 15 fps */
+
+ /* don't hope more than 15 fps with USB 1.1 and
+ * image resolution >= 640x480 */
+ if (gspca_dev->width >= 640
+ && gspca_dev->dev->speed == USB_SPEED_FULL)
+ bandwidth *= 15; /* 15 fps */
+ else
+ bandwidth *= 30; /* 30 fps */
}
PDEBUG(D_STREAM, "min bandwidth: %d", bandwidth);
@@ -667,9 +676,8 @@ struct ep_tb_s {
* build the table of the endpoints
* and compute the minimum bandwidth for the image transfer
*/
-static int build_ep_tb(struct gspca_dev *gspca_dev,
+static int build_isoc_ep_tb(struct gspca_dev *gspca_dev,
struct usb_interface *intf,
- int xfer,
struct ep_tb_s *ep_tb)
{
struct usb_host_endpoint *ep;
@@ -687,17 +695,21 @@ static int build_ep_tb(struct gspca_dev *gspca_dev,
ep_tb->bandwidth = 2000 * 2000 * 120;
found = 0;
for (j = 0; j < nbalt; j++) {
- ep = alt_xfer(&intf->altsetting[j], xfer);
+ ep = alt_xfer(&intf->altsetting[j],
+ USB_ENDPOINT_XFER_ISOC);
if (ep == NULL)
continue;
+ if (ep->desc.bInterval == 0) {
+ pr_err("alt %d iso endp with 0 interval\n", j);
+ continue;
+ }
psize = le16_to_cpu(ep->desc.wMaxPacketSize);
- if (!gspca_dev->cam.bulk) /* isoc */
- psize = (psize & 0x07ff) *
- (1 + ((psize >> 11) & 3));
- bandwidth = psize * ep->desc.bInterval * 1000;
+ psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
+ bandwidth = psize * 1000;
if (gspca_dev->dev->speed == USB_SPEED_HIGH
|| gspca_dev->dev->speed == USB_SPEED_SUPER)
bandwidth *= 8;
+ bandwidth /= 1 << (ep->desc.bInterval - 1);
if (bandwidth <= last_bw)
continue;
if (bandwidth < ep_tb->bandwidth) {
@@ -715,6 +727,23 @@ static int build_ep_tb(struct gspca_dev *gspca_dev,
ep_tb++;
}
+ /*
+ * If the camera:
+ * has a usb audio class interface (a built in usb mic); and
+ * is a usb 1 full speed device; and
+ * uses the max full speed iso bandwidth; and
+ * and has more than 1 alt setting
+ * then skip the highest alt setting to spare bandwidth for the mic
+ */
+ if (gspca_dev->audio &&
+ gspca_dev->dev->speed == USB_SPEED_FULL &&
+ last_bw >= 1000000 &&
+ i > 1) {
+ PDEBUG(D_STREAM, "dev has usb audio, skipping highest alt");
+ i--;
+ ep_tb--;
+ }
+
/* get the requested bandwidth and start at the highest atlsetting */
bandwidth = which_bandwidth(gspca_dev);
ep_tb--;
@@ -790,10 +819,7 @@ static int create_urbs(struct gspca_dev *gspca_dev,
ep->desc.bEndpointAddress);
urb->transfer_flags = URB_ISO_ASAP
| URB_NO_TRANSFER_DMA_MAP;
- if (gspca_dev->dev->speed == USB_SPEED_LOW)
- urb->interval = ep->desc.bInterval;
- else
- urb->interval = 1 << (ep->desc.bInterval - 1);
+ urb->interval = 1 << (ep->desc.bInterval - 1);
urb->complete = isoc_irq;
urb->number_of_packets = npkt;
for (i = 0; i < npkt; i++) {
@@ -848,7 +874,7 @@ static int gspca_init_transfer(struct gspca_dev *gspca_dev)
xfer = gspca_dev->cam.bulk ? USB_ENDPOINT_XFER_BULK
: USB_ENDPOINT_XFER_ISOC;
- /* if the subdriver forced an altsetting, get the endpoint */
+ /* if bulk or the subdriver forced an altsetting, get the endpoint */
if (gspca_dev->alt != 0) {
gspca_dev->alt--; /* (previous version compatibility) */
ep = alt_xfer(&intf->altsetting[gspca_dev->alt], xfer);
@@ -863,7 +889,7 @@ static int gspca_init_transfer(struct gspca_dev *gspca_dev)
/* else, compute the minimum bandwidth
* and build the endpoint table */
- alt_idx = build_ep_tb(gspca_dev, intf, xfer, ep_tb);
+ alt_idx = build_isoc_ep_tb(gspca_dev, intf, ep_tb);
if (alt_idx <= 0) {
pr_err("no transfer endpoint found\n");
ret = -EIO;
@@ -880,7 +906,7 @@ static int gspca_init_transfer(struct gspca_dev *gspca_dev)
for (;;) {
if (alt != gspca_dev->alt) {
alt = gspca_dev->alt;
- if (gspca_dev->nbalt > 1) {
+ if (intf->num_altsetting > 1) {
ret = usb_set_interface(gspca_dev->dev,
gspca_dev->iface,
alt);
@@ -2300,15 +2326,14 @@ int gspca_dev_probe2(struct usb_interface *intf,
}
gspca_dev->dev = dev;
gspca_dev->iface = intf->cur_altsetting->desc.bInterfaceNumber;
- gspca_dev->nbalt = intf->num_altsetting;
/* check if any audio device */
- if (dev->config->desc.bNumInterfaces != 1) {
+ if (dev->actconfig->desc.bNumInterfaces != 1) {
int i;
struct usb_interface *intf2;
- for (i = 0; i < dev->config->desc.bNumInterfaces; i++) {
- intf2 = dev->config->interface[i];
+ for (i = 0; i < dev->actconfig->desc.bNumInterfaces; i++) {
+ intf2 = dev->actconfig->interface[i];
if (intf2 != NULL
&& intf2->altsetting != NULL
&& intf2->altsetting->desc.bInterfaceClass ==
@@ -2389,7 +2414,7 @@ int gspca_dev_probe(struct usb_interface *intf,
}
/* the USB video interface must be the first one */
- if (dev->config->desc.bNumInterfaces != 1
+ if (dev->actconfig->desc.bNumInterfaces != 1
&& intf->cur_altsetting->desc.bInterfaceNumber != 0)
return -ENODEV;
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-30 09:31:54 +0000