V4L/DVB (10251): cx25840: add comments explaining what the init() does.

[safe/jmp/linux-2.6] / drivers / media / video / cx25840 / cx25840-core.c

diff --git a/drivers/media/video/cx25840/cx25840-core.c b/drivers/media/video/cx25840/cx25840-core.c
index 25eb3be..be467b4 100644 (file)
--- 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);