The patch number 13232 was added via Mauro Carvalho Chehab <mche...@redhat.com>
to http://linuxtv.org/hg/v4l-dvb master development tree.
Kernel patches in this development tree may be modified to be backward
compatible with older kernels. Compatibility modifications will be
removed before inclusion into the mainstream Kernel
If anyone has any objections, please let us know by sending a message to:
Linux Media Mailing List <linux-me...@vger.kernel.org>
------
From: Aleksandr V. Piskunov <aleksandr.v.pisku...@gmail.com>
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.
Priority: normal
Signed-off-by: Aleksandr V. Piskunov <alexandr.v.pisku...@gmail.com>
Reviewed-by: Andy Walls <awa...@radix.net>
Signed-off-by: Mauro Carvalho Chehab <mche...@redhat.com>
---
linux/drivers/media/video/cx25840/cx25840-core.c | 25 ++++++++++++---
1 file changed, 21 insertions(+), 4 deletions(-)
diff -r ab2315cc5504 -r fa7323f7801e
linux/drivers/media/video/cx25840/cx25840-core.c
--- a/linux/drivers/media/video/cx25840/cx25840-core.c Thu Sep 24 10:58:09
2009 +0000
+++ b/linux/drivers/media/video/cx25840/cx25840-core.c Fri Sep 25 21:16:21
2009 +0000
@@ -717,13 +717,30 @@
}
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);
---
Patch is available at:
http://linuxtv.org/hg/v4l-dvb/rev/fa7323f7801e67ef8b7aad0302084def019d2ae4
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