On 03.04.2012 03:44, Gianluca Gennari wrote:
Il 03/04/2012 00:40, Antti Palosaari ha scritto:
On 03.04.2012 00:25, Gianluca Gennari wrote:
This is necessary to tune VHF channels with the AVerMedia A835 stick.
Signed-off-by: Gianluca Gennari<gennarone@xxxxxxxxx>
---
drivers/media/common/tuners/tda18218.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)
diff --git a/drivers/media/common/tuners/tda18218.c
b/drivers/media/common/tuners/tda18218.c
index dfb3a83..b079696 100644
--- a/drivers/media/common/tuners/tda18218.c
+++ b/drivers/media/common/tuners/tda18218.c
@@ -144,7 +144,7 @@ static int tda18218_set_params(struct dvb_frontend
*fe)
priv->if_frequency = 3000000;
} else if (bw<= 7000000) {
LP_Fc = 1;
- priv->if_frequency = 3500000;
+ priv->if_frequency = 4000000;
} else {
LP_Fc = 2;
priv->if_frequency = 4000000;
Kwaak, I will not apply that until I have done background checking. That
driver is used only by AF9015 currently. And I did that driver as
reverse-engineering and thus there is some things guessed. I have only 8
MHz wide signal, thus I never tested 7 and 6 MHz. Have no DVB-T
modulator either... Maybe some AF9015 user can confirm? Is there any
AF9015& TDA18218 bug reports seen in discussion forums...
A friend has a AF9015+TDA18218 stick and told me that it works fine with
the patch (including VHF), but to be safe I will ask him to double check
with the current media_build tree, with and without the patch. In the
worst case, we can add a new parameter (or an array of parameters) for
the IF frequency to struct tda18218_config.
Public short datasheet [1], page 16, says default IFs are BW=8 MHz IF=4
MHz, BW=7 MHz IF=3.5 MHz, BW=6 MHz IF=3 MHz. I suspect it still locks in
some cases even IF is off-by 0.5 MHz for BW 7 and 8 but performance is
reduced. So there is now something wrong, likely bug in the tda18218 driver.
Could someone send me Windows sniff from success tune to 7 MHz BW channel?
[1] http://www.nxp.com/documents/data_sheet/TDA18218HN.pdf
--
http://palosaari.fi/
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