cx25840:
Disable 6.5MHz carrier autodetection for PAL, always assume its DK.
Only try to autodetect 6.5MHz carrier for SECAM if user accepts both
system DK and L.
Signed-off-by: Aleksandr V. Piskunov <alexandr.v.piskunov@xxxxxxxxx>
diff --git a/linux/drivers/media/video/cx25840/cx25840-core.c b/linux/drivers/media/video/cx25840/cx25840-core.c
--- a/linux/drivers/media/video/cx25840/cx25840-core.c
+++ b/linux/drivers/media/video/cx25840/cx25840-core.c
@@ -647,13 +647,30 @@
}
cx25840_write(client, 0x80b, 0x00);
} else if (std & V4L2_STD_PAL) {
- /* Follow tuner change procedure for PAL */
+ /* Autodetect audio standard and audio system */
cx25840_write(client, 0x808, 0xff);
- cx25840_write(client, 0x80b, 0x10);
+ /* Since system PAL-L is pretty much non-existant and
+ not used by any public broadcast network, force
+ 6.5 MHz carrier to be interpreted as System DK,
+ this avoids DK audio detection instability */
+ cx25840_write(client, 0x80b, 0x00);
} else if (std & V4L2_STD_SECAM) {
- /* Select autodetect for SECAM */
+ /* Autodetect audio standard and audio system */
cx25840_write(client, 0x808, 0xff);
- cx25840_write(client, 0x80b, 0x10);
+ /* If only one of SECAM-DK / SECAM-L is required, then force
+ 6.5MHz carrier, else autodetect it */
+ if ((std & V4L2_STD_SECAM_DK) &&
+ !(std & (V4L2_STD_SECAM_L | V4L2_STD_SECAM_LC))) {
+ /* 6.5 MHz carrier to be interpreted as System DK */
+ cx25840_write(client, 0x80b, 0x00);
+ } else if (!(std & V4L2_STD_SECAM_DK) &&
+ (std & (V4L2_STD_SECAM_L | V4L2_STD_SECAM_LC))) {
+ /* 6.5 MHz carrier to be interpreted as System L */
+ cx25840_write(client, 0x80b, 0x08);
+ } else {
+ /* 6.5 MHz carrier to be autodetected */
+ cx25840_write(client, 0x80b, 0x10);
+ }
}
cx25840_and_or(client, 0x810, ~0x01, 0);
--
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