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| author | Aleksandr V. Piskunov <aleksandr.v.piskunov@gmail.com> | 2009-09-25 23:16:21 +0200 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2009-12-05 21:41:01 +0100 |
| commit | 3c3099d5edd719aebfccf63b628b6f11afa59bfe (patch) | |
| tree | 35c145624b83704e0164e5b5aa6c9c0074c17636 /drivers/media/video/cx25840 | |
| parent | V4L/DVB (13231): pwc: Use kernel's simple_strtol() (diff) | |
| download | linux-3c3099d5edd719aebfccf63b628b6f11afa59bfe.tar.xz linux-3c3099d5edd719aebfccf63b628b6f11afa59bfe.zip | |
V4L/DVB (13232): cx25840 6.5MHz carrier detection fixes
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@gmail.com>
Reviewed-by: Andy Walls <awalls@radix.net>
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 | 25 |
1 files changed, 21 insertions, 4 deletions
diff --git a/drivers/media/video/cx25840/cx25840-core.c b/drivers/media/video/cx25840/cx25840-core.c index 9702a9334b4a..385ecd58f1c0 100644 --- a/drivers/media/video/cx25840/cx25840-core.c +++ b/drivers/media/video/cx25840/cx25840-core.c @@ -685,13 +685,30 @@ static void input_change(struct i2c_client *client) } 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); |