diff options
| -rw-r--r-- | drivers/media/video/uvc/uvc_driver.c | 9 | ||||
| -rw-r--r-- | drivers/media/video/uvc/uvc_video.c | 34 | ||||
| -rw-r--r-- | drivers/media/video/uvc/uvcvideo.h | 1 |
3 files changed, 40 insertions, 4 deletions
diff --git a/drivers/media/video/uvc/uvc_driver.c b/drivers/media/video/uvc/uvc_driver.c index ebcd5bf0edb..22e2783ac55 100644 --- a/drivers/media/video/uvc/uvc_driver.c +++ b/drivers/media/video/uvc/uvc_driver.c @@ -1861,6 +1861,15 @@ static struct usb_device_id uvc_ids[] = { .bInterfaceSubClass = 1, .bInterfaceProtocol = 0, .driver_info = UVC_QUIRK_STREAM_NO_FID }, + /* ViMicro */ + { .match_flags = USB_DEVICE_ID_MATCH_VENDOR + | USB_DEVICE_ID_MATCH_INT_INFO, + .idVendor = 0x0ac8, + .idProduct = 0x0000, + .bInterfaceClass = USB_CLASS_VIDEO, + .bInterfaceSubClass = 1, + .bInterfaceProtocol = 0, + .driver_info = UVC_QUIRK_FIX_BANDWIDTH }, /* MT6227 */ { .match_flags = USB_DEVICE_ID_MATCH_DEVICE | USB_DEVICE_ID_MATCH_INT_INFO, diff --git a/drivers/media/video/uvc/uvc_video.c b/drivers/media/video/uvc/uvc_video.c index 0789ba381fc..a95e17329c5 100644 --- a/drivers/media/video/uvc/uvc_video.c +++ b/drivers/media/video/uvc/uvc_video.c @@ -61,7 +61,7 @@ int uvc_query_ctrl(struct uvc_device *dev, __u8 query, __u8 unit, return 0; } -static void uvc_fixup_buffer_size(struct uvc_video_device *video, +static void uvc_fixup_video_ctrl(struct uvc_video_device *video, struct uvc_streaming_control *ctrl) { struct uvc_format *format; @@ -84,6 +84,31 @@ static void uvc_fixup_buffer_size(struct uvc_video_device *video, video->dev->uvc_version < 0x0110)) ctrl->dwMaxVideoFrameSize = frame->dwMaxVideoFrameBufferSize; + + if (video->dev->quirks & UVC_QUIRK_FIX_BANDWIDTH && + video->streaming->intf->num_altsetting > 1) { + u32 interval; + u32 bandwidth; + + interval = (ctrl->dwFrameInterval > 100000) + ? ctrl->dwFrameInterval + : frame->dwFrameInterval[0]; + + /* Compute a bandwidth estimation by multiplying the frame + * size by the number of video frames per second, divide the + * result by the number of USB frames (or micro-frames for + * high-speed devices) per second and add the UVC header size + * (assumed to be 12 bytes long). + */ + bandwidth = frame->wWidth * frame->wHeight / 8 * format->bpp; + bandwidth *= 10000000 / interval + 1; + bandwidth /= 1000; + if (video->dev->udev->speed == USB_SPEED_HIGH) + bandwidth /= 8; + bandwidth += 12; + + ctrl->dwMaxPayloadTransferSize = bandwidth; + } } static int uvc_get_video_ctrl(struct uvc_video_device *video, @@ -158,10 +183,11 @@ static int uvc_get_video_ctrl(struct uvc_video_device *video, ctrl->bMaxVersion = 0; } - /* Some broken devices return a null or wrong dwMaxVideoFrameSize. - * Try to get the value from the format and frame descriptors. + /* Some broken devices return null or wrong dwMaxVideoFrameSize and + * dwMaxPayloadTransferSize fields. Try to get the value from the + * format and frame descriptors. */ - uvc_fixup_buffer_size(video, ctrl); + uvc_fixup_video_ctrl(video, ctrl); ret = 0; out: diff --git a/drivers/media/video/uvc/uvcvideo.h b/drivers/media/video/uvc/uvcvideo.h index 6f55c4d49cf..e5014e668f9 100644 --- a/drivers/media/video/uvc/uvcvideo.h +++ b/drivers/media/video/uvc/uvcvideo.h @@ -314,6 +314,7 @@ struct uvc_xu_control { #define UVC_QUIRK_STREAM_NO_FID 0x00000010 #define UVC_QUIRK_IGNORE_SELECTOR_UNIT 0x00000020 #define UVC_QUIRK_PRUNE_CONTROLS 0x00000040 +#define UVC_QUIRK_FIX_BANDWIDTH 0x00000080 /* Format flags */ #define UVC_FMT_FLAG_COMPRESSED 0x00000001 |