[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>

1 files changed, 14 insertions, 40 deletions

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 @@ void pwc_isoc_cleanup(struct pwc_device *pdev)
 	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 @@ static int pwc_video_open(struct file *file)
 	/* 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 @@ static int pwc_video_open(struct file *file)
 		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 @@ static ssize_t pwc_video_read(struct file *file, char __user *buf,
 		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 @@ static unsigned int pwc_video_poll(struct file *file, poll_table *wait)
 {
 	struct video_device *vdev = file->private_data;
 	struct pwc_device *pdev;
+	int ret;
 
 	if (vdev == NULL)
 		return -EFAULT;
@@ -1401,6 +1368,13 @@ static unsigned int pwc_video_poll(struct file *file, poll_table *wait)
 	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;