[media] pwc: do not start isoc stream on /dev/video open
pwc was starting streaming on /dev/video# open rather then on STREAM_ON. Now
that the v4l1 compat code is removed from the pwc driver there is no reason
left to do this. So this patch changes the pwc driver to delay starting
the isoc stream (and thus using valuable usb bandwidth) until the application
does a STREAM_ON
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/video/pwc/pwc-ctrl.c b/drivers/media/video/pwc/pwc-ctrl.c
index 6b8fbdd..1593f8d 100644
--- a/drivers/media/video/pwc/pwc-ctrl.c
+++ b/drivers/media/video/pwc/pwc-ctrl.c
@@ -1386,11 +1386,16 @@
{
ARG_DEF(int, qual)
+ if (pdev->iso_init) {
+ ret = -EBUSY;
+ break;
+ }
+
ARG_IN(qual)
if (ARGR(qual) < 0 || ARGR(qual) > 3)
ret = -EINVAL;
else
- ret = pwc_try_video_mode(pdev, pdev->view.x, pdev->view.y, pdev->vframes, ARGR(qual), pdev->vsnapshot);
+ ret = pwc_set_video_mode(pdev, pdev->view.x, pdev->view.y, pdev->vframes, ARGR(qual), pdev->vsnapshot);
if (ret >= 0)
pdev->vcompression = ARGR(qual);
break;
diff --git a/drivers/media/video/pwc/pwc-if.c b/drivers/media/video/pwc/pwc-if.c
index b821065..6f8b682 100644
--- a/drivers/media/video/pwc/pwc-if.c
+++ b/drivers/media/video/pwc/pwc-if.c
@@ -966,36 +966,6 @@
PWC_DEBUG_OPEN("<< pwc_isoc_cleanup()\n");
}
-int pwc_try_video_mode(struct pwc_device *pdev, int width, int height, int new_fps, int new_compression, int new_snapshot)
-{
- int ret, start;
-
- /* Stop isoc stuff */
- pwc_isoc_cleanup(pdev);
- /* Reset parameters */
- pwc_reset_buffers(pdev);
- /* Try to set video mode... */
- start = ret = pwc_set_video_mode(pdev, width, height, new_fps, new_compression, new_snapshot);
- if (ret) {
- PWC_DEBUG_FLOW("pwc_set_video_mode attempt 1 failed.\n");
- /* That failed... restore old mode (we know that worked) */
- start = pwc_set_video_mode(pdev, pdev->view.x, pdev->view.y, pdev->vframes, pdev->vcompression, pdev->vsnapshot);
- if (start) {
- PWC_DEBUG_FLOW("pwc_set_video_mode attempt 2 failed.\n");
- }
- }
- if (start == 0)
- {
- if (pwc_isoc_init(pdev) < 0)
- {
- PWC_WARNING("Failed to restart ISOC transfers in pwc_try_video_mode.\n");
- ret = -EAGAIN; /* let's try again, who knows if it works a second time */
- }
- }
- pdev->drop_frames++; /* try to avoid garbage during switch */
- return ret; /* Return original error code */
-}
-
/*********
* sysfs
*********/
@@ -1175,7 +1145,7 @@
/* Set some defaults */
pdev->vsnapshot = 0;
- /* Start iso pipe for video; first try the last used video size
+ /* Set video size, first try the last used video size
(or the default one); if that fails try QCIF/10 or QSIF/10;
it that fails too, give up.
*/
@@ -1202,15 +1172,6 @@
return i;
}
- i = pwc_isoc_init(pdev);
- if (i) {
- PWC_DEBUG_OPEN("Failed to init ISOC stuff = %d.\n", i);
- pwc_isoc_cleanup(pdev);
- pwc_free_buffers(pdev);
- mutex_unlock(&pdev->modlock);
- return i;
- }
-
/* Initialize the webcam to sane value */
pwc_set_brightness(pdev, 0x7fff);
pwc_set_agc(pdev, 1, 0);
@@ -1325,6 +1286,11 @@
goto err_out;
}
+ /* Start the stream (if not already started) */
+ rv = pwc_isoc_init(pdev);
+ if (rv)
+ goto err_out;
+
/* In case we're doing partial reads, we don't have to wait for a frame */
if (pdev->image_read_pos == 0) {
/* Do wait queueing according to the (doc)book */
@@ -1394,6 +1360,7 @@
{
struct video_device *vdev = file->private_data;
struct pwc_device *pdev;
+ int ret;
if (vdev == NULL)
return -EFAULT;
@@ -1401,6 +1368,13 @@
if (pdev == NULL)
return -EFAULT;
+ /* Start the stream (if not already started) */
+ mutex_lock(&pdev->modlock);
+ ret = pwc_isoc_init(pdev);
+ mutex_unlock(&pdev->modlock);
+ if (ret)
+ return ret;
+
poll_wait(file, &pdev->frameq, wait);
if (pdev->error_status)
return POLLERR;
diff --git a/drivers/media/video/pwc/pwc-v4l.c b/drivers/media/video/pwc/pwc-v4l.c
index 7061a03f..2ef1668 100644
--- a/drivers/media/video/pwc/pwc-v4l.c
+++ b/drivers/media/video/pwc/pwc-v4l.c
@@ -309,7 +309,10 @@
pixelformat != V4L2_PIX_FMT_PWC2)
return -EINVAL;
- PWC_DEBUG_IOCTL("Try to change format to: width=%d height=%d fps=%d "
+ if (pdev->iso_init)
+ return -EBUSY;
+
+ PWC_DEBUG_IOCTL("Trying to set format to: width=%d height=%d fps=%d "
"compression=%d snapshot=%d format=%c%c%c%c\n",
f->fmt.pix.width, f->fmt.pix.height, fps,
compression, snapshot,
@@ -318,14 +321,14 @@
(pixelformat>>16)&255,
(pixelformat>>24)&255);
- ret = pwc_try_video_mode(pdev,
+ ret = pwc_set_video_mode(pdev,
f->fmt.pix.width,
f->fmt.pix.height,
fps,
compression,
snapshot);
- PWC_DEBUG_IOCTL("pwc_try_video_mode(), return=%d\n", ret);
+ PWC_DEBUG_IOCTL("pwc_set_video_mode(), return=%d\n", ret);
if (ret)
return ret;
@@ -882,9 +885,7 @@
case VIDIOC_STREAMON:
{
- /* WARNING: pwc_try_video_mode() called pwc_isoc_init */
- pwc_isoc_init(pdev);
- return 0;
+ return pwc_isoc_init(pdev);
}
case VIDIOC_STREAMOFF:
diff --git a/drivers/media/video/pwc/pwc.h b/drivers/media/video/pwc/pwc.h
index 36a9c83..16bbc6d 100644
--- a/drivers/media/video/pwc/pwc.h
+++ b/drivers/media/video/pwc/pwc.h
@@ -275,7 +275,6 @@
extern int pwc_mbufs;
/** functions in pwc-if.c */
-int pwc_try_video_mode(struct pwc_device *pdev, int width, int height, int new_fps, int new_compression, int new_snapshot);
int pwc_handle_frame(struct pwc_device *pdev);
void pwc_next_image(struct pwc_device *pdev);
int pwc_isoc_init(struct pwc_device *pdev);
