Hi Laurent,
On 06/11/2018 23:08, Laurent Pinchart wrote:
> Hi Kieran,
>
> Thank you for the patch.
>
> On Tuesday, 6 November 2018 23:27:18 EET Kieran Bingham wrote:
>> From: Kieran Bingham <kieran.bingham@xxxxxxxxxxxxxxxx>
>>
>> uvc_video_enable() is used both to start and stop the video stream
>> object, however the single function entry point shares no code between
>> the two operations.
>>
>> Split the function into two distinct calls, and rename to
>> uvc_video_start_streaming() and uvc_video_stop_streaming() as
>> appropriate.
>>
>> Signed-off-by: Kieran Bingham <kieran.bingham@xxxxxxxxxxxxxxxx>
>> ---
>> drivers/media/usb/uvc/uvc_queue.c | 4 +-
>> drivers/media/usb/uvc/uvc_video.c | 56 +++++++++++++++-----------------
>> drivers/media/usb/uvc/uvcvideo.h | 3 +-
>> 3 files changed, 31 insertions(+), 32 deletions(-)
>>
>> diff --git a/drivers/media/usb/uvc/uvc_queue.c
>> b/drivers/media/usb/uvc/uvc_queue.c index cd8c03341de0..682698ec1118 100644
>> --- a/drivers/media/usb/uvc/uvc_queue.c
>> +++ b/drivers/media/usb/uvc/uvc_queue.c
>> @@ -176,7 +176,7 @@ static int uvc_start_streaming(struct vb2_queue *vq,
>> unsigned int count)
>>
>> queue->buf_used = 0;
>>
>> - ret = uvc_video_enable(stream, 1);
>> + ret = uvc_video_start_streaming(stream);
>> if (ret == 0)
>> return 0;
>>
>> @@ -194,7 +194,7 @@ static void uvc_stop_streaming(struct vb2_queue *vq)
>> lockdep_assert_irqs_enabled();
>>
>> if (vq->type != V4L2_BUF_TYPE_META_CAPTURE)
>> - uvc_video_enable(uvc_queue_to_stream(queue), 0);
>> + uvc_video_stop_streaming(uvc_queue_to_stream(queue));
>>
>> spin_lock_irq(&queue->irqlock);
>> uvc_queue_return_buffers(queue, UVC_BUF_STATE_ERROR);
>> diff --git a/drivers/media/usb/uvc/uvc_video.c
>> b/drivers/media/usb/uvc/uvc_video.c index ce9e40444507..0d35e933856a 100644
>> --- a/drivers/media/usb/uvc/uvc_video.c
>> +++ b/drivers/media/usb/uvc/uvc_video.c
>> @@ -2082,38 +2082,10 @@ int uvc_video_init(struct uvc_streaming *stream)
>> return 0;
>> }
>>
>> -/*
>> - * Enable or disable the video stream.
>> - */
>> -int uvc_video_enable(struct uvc_streaming *stream, int enable)
>> +int uvc_video_start_streaming(struct uvc_streaming *stream)
>> {
>> int ret;
>>
>> - if (!enable) {
>> - uvc_uninit_video(stream, 1);
>> - if (stream->intf->num_altsetting > 1) {
>> - usb_set_interface(stream->dev->udev,
>> - stream->intfnum, 0);
>> - } else {
>> - /* 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.
>> - */
>> - unsigned int epnum = stream->header.bEndpointAddress
>> - & USB_ENDPOINT_NUMBER_MASK;
>> - unsigned int dir = stream->header.bEndpointAddress
>> - & USB_ENDPOINT_DIR_MASK;
>> - unsigned int pipe;
>> -
>> - pipe = usb_sndbulkpipe(stream->dev->udev, epnum) | dir;
>> - usb_clear_halt(stream->dev->udev, pipe);
>> - }
>> -
>> - uvc_video_clock_cleanup(stream);
>> - return 0;
>> - }
>> -
>> ret = uvc_video_clock_init(stream);
>> if (ret < 0)
>> return ret;
>> @@ -2136,3 +2108,29 @@ int uvc_video_enable(struct uvc_streaming *stream,
>> int enable)
>>
>> return ret;
>> }
>> +
>> +int uvc_video_stop_streaming(struct uvc_streaming *stream)
>> +{
>> + uvc_uninit_video(stream, 1);
>> + if (stream->intf->num_altsetting > 1) {
>> + usb_set_interface(stream->dev->udev,
>> + stream->intfnum, 0);
>
> This now holds on a single line.
Ah yes.
>
>> + } else {
>> + /* UVC doesn't specify how to inform a bulk-based device
>
> Let's fix the checkpatch.pl warning here.
Oh ? I didn't get any checkpatch warnings. Do I need to add some
parameters to my checkpatch now?
>
>> + * when the video stream is stopped. Windows sends a
>> + * CLEAR_FEATURE(HALT) request to the video streaming
>> + * bulk endpoint, mimic the same behaviour.
>> + */
>> + unsigned int epnum = stream->header.bEndpointAddress
>> + & USB_ENDPOINT_NUMBER_MASK;
>> + unsigned int dir = stream->header.bEndpointAddress
>> + & USB_ENDPOINT_DIR_MASK;
>> + unsigned int pipe;
>> +
>> + pipe = usb_sndbulkpipe(stream->dev->udev, epnum) | dir;
>> + usb_clear_halt(stream->dev->udev, pipe);
>> + }
>> +
>> + uvc_video_clock_cleanup(stream);
>> + return 0;
>
> As this always return 0 you can make it a void function.
Certainly.
>
> Apart from that,
>
> Reviewed-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
>
> I'll take the patch in my tree with the above changes.
>
Great, thanks.
--
KB
>> +}
>> diff --git a/drivers/media/usb/uvc/uvcvideo.h
>> b/drivers/media/usb/uvc/uvcvideo.h index 0953e2e59a79..c0a120496a1f 100644
>> --- a/drivers/media/usb/uvc/uvcvideo.h
>> +++ b/drivers/media/usb/uvc/uvcvideo.h
>> @@ -784,7 +784,8 @@ void uvc_mc_cleanup_entity(struct uvc_entity *entity);
>> int uvc_video_init(struct uvc_streaming *stream);
>> int uvc_video_suspend(struct uvc_streaming *stream);
>> int uvc_video_resume(struct uvc_streaming *stream, int reset);
>> -int uvc_video_enable(struct uvc_streaming *stream, int enable);
>> +int uvc_video_start_streaming(struct uvc_streaming *stream);
>> +int uvc_video_stop_streaming(struct uvc_streaming *stream);
>> int uvc_probe_video(struct uvc_streaming *stream,
>> struct uvc_streaming_control *probe);
>> int uvc_query_ctrl(struct uvc_device *dev, u8 query, u8 unit,
>
