Sorry I've been so MIA, I've had a lot of work to do recently.
Tyler Trafford wrote:
No, it does- but that magic is just a manual write to the tda9887, and
Bryan intended that patch to be a test to see if that really was the
source of your problem.
The black magic patch sets up the tda9887 thusly:
port1 and port2 = 0 (active, not a typo)
sound intercarrier = 6.0 MHz
fVIF (I have no idea what this is) = 38.9MHz
forced audio mute = off
modulation = negative FM
carrier mode = QSS
automute FM = active
video mode sound trap = active
audo gain = 0dB
de-emphasis time = 50us
de-emphasis = on
tuner takeover = +0
SECAM-L PLL gating = 36% modulation
Generally speaking, those are the the default settings for PAL-I,
except for port1 and port2 which are forced to 1 (disabled) by the
tda9887 driver. I hypothesize that enabling output on the two ports is
what makes the black magic work. Forcing this with black magic has a
downside though, since SECAM-L will never work, and the different PAL
standards use different frequencies for sound intercarrier (ranging from
4.5MHz for M/N, to 6.5 for DK). Fine tuning would probably have to be
used to get the sound intercarrier to lock, but then there would be a
loss of luma information and more chroma would be notched, increasing
"dot crawl".
Anyway, the point is that's why I submitted the patch to force port1
= port2 = 0 if: tda9887=0 is passed as a module param OR a PVR-150 or
PVR-500 is detected and the video standard is PAL. I've been having
doubts if that is the right thing to do though.
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