Hi Simon,
On Wed, Sep 28, 2011 at 8:50 AM, Simon Farnsworth
<simon.farnsworth@xxxxxxxxxx> wrote:
> (note - the CC list is everyone over 50% certainty from get_maintainer.pl)
>
> I'm having problems getting a Hauppauge HVR-1110 card to successfully
> tune PAL-D at 85.250 MHz vision frequency; by experimentation, I've
> determined that the tda18271 is tuning to a frequency 1.25 MHz lower
> than the vision frequency I've requested, so the following workaround
> "fixes" it for me.
>
> diff --git a/drivers/media/common/tuners/tda18271-fe.c
> b/drivers/media/common/tuners/tda18271-fe.c
> index 63cc400..1a94e1a 100644
> --- a/drivers/media/common/tuners/tda18271-fe.c
> +++ b/drivers/media/common/tuners/tda18271-fe.c
> @@ -1031,6 +1031,7 @@ static int tda18271_set_analog_params(struct
> dvb_frontend *fe,
> mode = "I";
> } else if (params->std & V4L2_STD_DK) {
> map = &std_map->atv_dk;
> + freq += 1250000;
> mode = "DK";
> } else if (params->std & V4L2_STD_SECAM_L) {
> map = &std_map->atv_l;
>
> I've checked with a signal analyser, and confirmed that my signal
> generator is getting the spectrum right - I am seeing vision peaking
> at 85.25 MHz, with one sideband going down to 84.5 MHz, and the other
> going up to 90.5MHz. I also see an audio carrier at 91.75 MHz.
>
> I'm going to run with this hack in place, but I'd appreciate it if
> someone who knew more about the TDA18271 looked at this, and either
> gave me a proper fix for testing, or confirmed that what I'm doing is
> right.
Hi Simon,
This is interesting. I did some testing with an 18271 based device a
few months back (a Hauppauge cx231xx based tuner), and I believe
PAL-DK was working (although I did have unrelated issues with the DIF
configuration).
When you are doing the tuning request, are you explicitly stating
PAL-D in your calling application? Or are you passing "PAL" to the
V4L layer and expecting it to work with a PAL-D feed?
I'm not doubting your findings, and clearly you've done a good bit of
research/analysis, but I did want to raise it as a data point to
consider....
Devin
--
Devin J. Heitmueller - Kernel Labs
http://www.kernellabs.com
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