V4L/DVB: uvcvideo: Restrict frame rates for Chicony CNF7129 webcam

At all frame rates except 30fps and 5fps the camera produces very dark
pictures. Auto-exposure is probably disabled by the camera at all frame
rates except 30fps, making them pretty unusable.

Work around the problem by introducing a new RESTRICT_FRAME_RATE quirk
that disables all the frame rates except the default one.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/video/uvc/uvc_driver.c b/drivers/media/video/uvc/uvc_driver.c
index 63756ca..2ac85d8 100644 (file)
--- a/drivers/media/video/uvc/uvc_driver.c
+++ b/drivers/media/video/uvc/uvc_driver.c
@@ -486,6 +486,12 @@ static int uvc_parse_format(struct uvc_device *dev,
                            max(frame->dwFrameInterval[0],
                                frame->dwDefaultFrameInterval));
 
+               if (dev->quirks & UVC_QUIRK_RESTRICT_FRAME_RATE) {
+                       frame->bFrameIntervalType = 1;
+                       frame->dwFrameInterval[0] =
+                               frame->dwDefaultFrameInterval;
+               }
+
                uvc_trace(UVC_TRACE_DESCR, "- %ux%u (%u.%u fps)\n",
                        frame->wWidth, frame->wHeight,
                        10000000/frame->dwDefaultFrameInterval,
@@ -2026,6 +2032,15 @@ static struct usb_device_id uvc_ids[] = {
          .bInterfaceClass      = USB_CLASS_VENDOR_SPEC,
          .bInterfaceSubClass   = 1,
          .bInterfaceProtocol   = 0 },
+       /* Chicony CNF7129 (Asus EEE 100HE) */
+       { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
+                               | USB_DEVICE_ID_MATCH_INT_INFO,
+         .idVendor             = 0x04f2,
+         .idProduct            = 0xb071,
+         .bInterfaceClass      = USB_CLASS_VIDEO,
+         .bInterfaceSubClass   = 1,
+         .bInterfaceProtocol   = 0,
+         .driver_info          = UVC_QUIRK_RESTRICT_FRAME_RATE },
        /* Alcor Micro AU3820 (Future Boy PC USB Webcam) */
        { .match_flags          = USB_DEVICE_ID_MATCH_DEVICE
                                | USB_DEVICE_ID_MATCH_INT_INFO,

diff --git a/drivers/media/video/uvc/uvcvideo.h b/drivers/media/video/uvc/uvcvideo.h
index bdacf3b..892e0e5 100644 (file)
--- a/drivers/media/video/uvc/uvcvideo.h
+++ b/drivers/media/video/uvc/uvcvideo.h
@@ -182,6 +182,7 @@ struct uvc_xu_control {
 #define UVC_QUIRK_IGNORE_SELECTOR_UNIT 0x00000020
 #define UVC_QUIRK_FIX_BANDWIDTH                0x00000080
 #define UVC_QUIRK_PROBE_DEF            0x00000100
+#define UVC_QUIRK_RESTRICT_FRAME_RATE  0x00000200
 
 /* Format flags */
 #define UVC_FMT_FLAG_COMPRESSED                0x00000001