diff options
| author | Hans Verkuil <hverkuil@xs4all.nl> | 2009-01-15 05:53:18 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2009-03-30 12:42:23 -0300 |
| commit | 6ca187abb2fc1a52b2a8e0422f3ffce2e3bb7ad0 (patch) | |
| tree | bd6720ce26a8eb2dd4a2038bb8d66c9a1b879172 /include/media/cx25840.h | |
| parent | c7d29e2f530654aa0c323aafb94d42a6a718482c (diff) | |
V4L/DVB (10251): cx25840: add comments explaining what the init() does.
Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'include/media/cx25840.h')
| -rw-r--r-- | include/media/cx25840.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/include/media/cx25840.h b/include/media/cx25840.h index db431d513f2f..2c3fbaa33f74 100644 --- a/include/media/cx25840.h +++ b/include/media/cx25840.h @@ -21,6 +21,18 @@ #ifndef _CX25840_H_ #define _CX25840_H_ +/* Note that the cx25840 driver requires that the bridge driver calls the + v4l2_subdev's init operation in order to load the driver's firmware. + Without this the audio standard detection will fail and you will + only get mono. + + Since loading the firmware is often problematic when the driver is + compiled into the kernel I recommend postponing calling this function + until the first open of the video device. Another reason for + postponing it is that loading this firmware takes a long time (seconds) + due to the slow i2c bus speed. So it will speed up the boot process if + you can avoid loading the fw as long as the video device isn't used. */ + enum cx25840_video_input { /* Composite video inputs In1-In8 */ CX25840_COMPOSITE1 = 1, |