V4L/DVB (13991): gspca_mr973010a: Fix cif type 1 cameras not streaming on UHCI controllers

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@auburn.edu>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/media/video/gspca/mr97310a.c b/drivers/media/video/gspca/mr97310a.c
index 9154870e07d2..0493e4043c0e 100644
--- 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_dev *gspca_dev)
                         {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,
                                          ARRAY_SIZE(cif_sensor1_init_data));
         }