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author | Hans Verkuil <hverkuil@xs4all.nl> | 2009-01-15 05:53:18 -0300 |
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committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2009-03-30 12:42:23 -0300 |
commit | 6ca187abb2fc1a52b2a8e0422f3ffce2e3bb7ad0 (patch) | |
tree | bd6720ce26a8eb2dd4a2038bb8d66c9a1b879172 /drivers/media/video/cx25840 | |
parent | c7d29e2f530654aa0c323aafb94d42a6a718482c (diff) | |
download | linux-3.10-6ca187abb2fc1a52b2a8e0422f3ffce2e3bb7ad0.tar.gz linux-3.10-6ca187abb2fc1a52b2a8e0422f3ffce2e3bb7ad0.tar.bz2 linux-3.10-6ca187abb2fc1a52b2a8e0422f3ffce2e3bb7ad0.zip |
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 'drivers/media/video/cx25840')
-rw-r--r-- | drivers/media/video/cx25840/cx25840-core.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/media/video/cx25840/cx25840-core.c b/drivers/media/video/cx25840/cx25840-core.c index 25eb3bec9e5..be467b4b954 100644 --- a/drivers/media/video/cx25840/cx25840-core.c +++ b/drivers/media/video/cx25840/cx25840-core.c @@ -1101,6 +1101,16 @@ static void log_audio_status(struct i2c_client *client) /* ----------------------------------------------------------------------- */ +/* This init operation must be called 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. */ static int cx25840_init(struct v4l2_subdev *sd, u32 val) { struct cx25840_state *state = to_state(sd); |