diff options
| author |   Janne Grunau <j@jannau.net> | 2009-03-27 20:21:17 -0300 |
|---|---|---|
| committer |   Mauro Carvalho Chehab <mchehab@redhat.com> | 2009-03-30 12:43:43 -0300 |
| commit | 7d771ff0dc3371923db929d9f88932acec3fc8e8 (patch) | |
| tree | 0b138d8896e464f27788ac47230cd8d804dbde6c /drivers | |
| parent | V4L/DVB (11246): hdpvr: convert printing macros to v4l2_* with struct v4l2_device (diff) | |
| download | linux-dev-7d771ff0dc3371923db929d9f88932acec3fc8e8.tar.xz linux-dev-7d771ff0dc3371923db929d9f88932acec3fc8e8.zip | |
V4L/DVB (11247): hdpvr: empty internal device buffer after stopping streaming
Makes the next capturing starting faster and more reliable.
Signed-off-by: Janne Grunau <j@jannau.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/media/video/hdpvr/hdpvr-video.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/drivers/media/video/hdpvr/hdpvr-video.c b/drivers/media/video/hdpvr/hdpvr-video.c index f6e1bcefddb7..3e6ffee8dfed 100644 --- a/drivers/media/video/hdpvr/hdpvr-video.c +++ b/drivers/media/video/hdpvr/hdpvr-video.c @@ -298,11 +298,20 @@ static int hdpvr_start_streaming(struct hdpvr_device *dev) /* function expects dev->io_mutex to be hold by caller */ static int hdpvr_stop_streaming(struct hdpvr_device *dev) { + uint actual_length, c = 0; + u8 *buf; + if (dev->status == STATUS_IDLE) return 0; else if (dev->status != STATUS_STREAMING) return -EAGAIN; + buf = kmalloc(dev->bulk_in_size, GFP_KERNEL); + if (!buf) + v4l2_err(&dev->v4l2_dev, "failed to allocate temporary buffer " + "for emptying the internal device buffer. " + "Next capture start will be slow\n"); + dev->status = STATUS_SHUTTING_DOWN; hdpvr_config_call(dev, CTRL_STOP_STREAMING_VALUE, 0x00); mutex_unlock(&dev->io_mutex); @@ -316,6 +325,23 @@ static int hdpvr_stop_streaming(struct hdpvr_device *dev) /* kill the still outstanding urbs */ hdpvr_cancel_queue(dev); + /* emptying the device buffer beforeshutting it down */ + while (buf && ++c < 500 && + !usb_bulk_msg(dev->udev, + usb_rcvbulkpipe(dev->udev, + dev->bulk_in_endpointAddr), + buf, dev->bulk_in_size, &actual_length, + BULK_URB_TIMEOUT)) { + /* wait */ + msleep(5); + v4l2_dbg(MSG_BUFFER, hdpvr_debug, &dev->v4l2_dev, + "%2d: got %d bytes\n", c, actual_length); + } + kfree(buf); + v4l2_dbg(MSG_BUFFER, hdpvr_debug, &dev->v4l2_dev, + "used %d urbs to empty device buffers\n", c-1); + msleep(10); + dev->status = STATUS_IDLE; return 0; |