git.ipfire.org Git - thirdparty/kernel/stable-queue.git/blob

   1 From 70136081fc67ea77d849f86fa323e5773c8e40ea Mon Sep 17 00:00:00 2001
   2 From: Theodore Kilgore <kilgota@auburn.edu>
   3 Date: Fri, 25 Dec 2009 05:15:10 -0300
   4 Subject: V4L/DVB (13991): gspca_mr973010a: Fix cif type 1 cameras not streaming on UHCI controllers
   5
   6 From: Theodore Kilgore <kilgota@auburn.edu>
   7
   8 commit 70136081fc67ea77d849f86fa323e5773c8e40ea upstream.
   9
  10 If you read the mail to Oliver Neukum on the linux-usb list, then you know
  11 that I found a cure for the mysterious problem that the MR97310a CIF "type
  12 1" cameras have been freezing up and refusing to stream if hooked up to a
  13 machine with a UHCI controller.
  14
  15 Namely, the cure is that if the camera is an mr97310a CIF type 1 camera, you
  16 have to send it 0xa0, 0x00. Somehow, this is a timing reset command, or
  17 such. It un-blocks whatever was previously stopping the CIF type 1 cameras
  18 from working on the UHCI-based machines.
  19
  20 Signed-off-by: Theodore Kilgore <kilgota@auburn.edu>
  21 Signed-off-by: Hans de Goede <hdegoede@redhat.com>
  22 Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
  23 Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
  24
  25 ---
  26  drivers/media/video/gspca/mr97310a.c |    6 ++++++
  27  1 file changed, 6 insertions(+)
  28
  29 --- a/drivers/media/video/gspca/mr97310a.c
  30 +++ b/drivers/media/video/gspca/mr97310a.c
  31 @@ -530,6 +530,12 @@ static int start_cif_cam(struct gspca_de
  32                         {0x13, 0x00, {0x01}, 1},
  33                         {0, 0, {0}, 0}
  34                 };
  35 +               /* Without this command the cam won't work with USB-UHCI */
  36 +               gspca_dev->usb_buf[0] = 0x0a;
  37 +               gspca_dev->usb_buf[1] = 0x00;
  38 +               err_code = mr_write(gspca_dev, 2);
  39 +               if (err_code < 0)
  40 +                       return err_code;
  41                 err_code = sensor_write_regs(gspca_dev, cif_sensor1_init_data,
  42                                          ARRAY_SIZE(cif_sensor1_init_data));
  43         }