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-rw-r--r--include/media/cx25840.h12
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,