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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>
This commit is contained in:
Aleksandr V. Piskunov 2009-09-25 18:16:21 -03:00 committed by Mauro Carvalho Chehab
parent 2d8d7762d7
commit 3c3099d5ed
1 changed files with 21 additions and 4 deletions
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25
drivers/media/video/cx25840/cx25840-core.c
View File

@ -685,13 +685,30 @@ static void input_change(struct i2c_client *client)
} }
cx25840_write(client, 0x80b, 0x00); cx25840_write(client, 0x80b, 0x00);
} else if (std & V4L2_STD_PAL) { } 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, 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) { } else if (std & V4L2_STD_SECAM) {
/* Select autodetect for SECAM */ /* Autodetect audio standard and audio system */
cx25840_write(client, 0x808, 0xff); 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); cx25840_and_or(client, 0x810, ~0x01, 0);