From: Greg KH on
2.6.33-stable review patch. If anyone has any objections, please let me know.


From: Theodore Kilgore <kilgota(a)>

commit 70136081fc67ea77d849f86fa323e5773c8e40ea upstream.

If you read the mail to Oliver Neukum on the linux-usb list, then you know
that I found a cure for the mysterious problem that the MR97310a CIF "type
1" cameras have been freezing up and refusing to stream if hooked up to a
machine with a UHCI controller.

Namely, the cure is that if the camera is an mr97310a CIF type 1 camera, you
have to send it 0xa0, 0x00. Somehow, this is a timing reset command, or
such. It un-blocks whatever was previously stopping the CIF type 1 cameras
from working on the UHCI-based machines.

Signed-off-by: Theodore Kilgore <kilgota(a)>
Signed-off-by: Hans de Goede <hdegoede(a)>
Signed-off-by: Mauro Carvalho Chehab <mchehab(a)>
Signed-off-by: Greg Kroah-Hartman <gregkh(a)>

drivers/media/video/gspca/mr97310a.c | 6 ++++++
1 file changed, 6 insertions(+)

--- a/drivers/media/video/gspca/mr97310a.c
+++ b/drivers/media/video/gspca/mr97310a.c
@@ -697,6 +697,12 @@ static int start_cif_cam(struct gspca_de
{0x13, 0x00, {0x01}, 1},
{0, 0, {0}, 0}
+ /* Without this command the cam won't work with USB-UHCI */
+ gspca_dev->usb_buf[0] = 0x0a;
+ gspca_dev->usb_buf[1] = 0x00;
+ err_code = mr_write(gspca_dev, 2);
+ if (err_code < 0)
+ return err_code;
err_code = sensor_write_regs(gspca_dev, cif_sensor1_init_data,

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