On Tuesday 15 January 2013 22:57:06 Ondrej Zary wrote: > On Monday 14 January 2013 22:29:58 Ondrej Zary wrote: > > On Saturday 12 January 2013 21:24:50 Ondrej Zary wrote: > > > Partially working: FM radio > > > Radio seems to be a long-standing problem with saa7134 cards using > > > silicon tuners (according to various mailing lists). > > > > > > On this card, GPIO11 controls 74HC4052 MUX. It switches two things: > > > something at TDA18271 V_IFAGC pin and something that goes to SAA7131E. > > > GPIO11 is enabled for radio and disabled for TV in Windows. I did the > > > same thing in this patch. > > > > > > Windows INF file says: > > > ; Setting FM radio of the Silicon tuner via SIF (GPIO 21 in use/ > > > 5.5MHz) HKR, "Audio", "FM Radio IF", 0x00010001, 0xDEEAAB > > > > > > But that seems not to be true. GPIO21 does nothing and RegSpy (from > > > DScaler, modified to include 0x42c register) says that the register is > > > 0x80729555. That matches the value present in saa7134-tvaudio.c (except > > > the first 0x80). > > > > > > With this value, the radio stations are off by about 4.2-4.3 MHz, e.g.: > > > station at 97.90 MHz is tuned as 102.20 MHz > > > station at 101.80 MHz is tuned as 106.0 MHz > > > > > > I also tried 0xDEEAAB. With this, the offset is different, about 0.4 > > > MHz: station at 101.80 MHz is tuned as 102.2 MHz > > > > The offset seems bogus, maybe affected by my TV antenna (cable). > > > > For debugging, tried another card with similar chips: Pinnacle PCTV > > 40i/50i/110i. It has SAA7131E chip too, but different tuner - TDA8275A. > > And the radio problem is the same as found first on the A706 - the tuned > > station sound starts but then turns into noise. So it seems that the > > problem is not in tda18271 but in tda8290 or saa7134. > > > > With tda8290.debug=1, I see this: > > tda829x 2-004b: tda8290 not locked, no signal? > > tda829x 2-004b: tda8290 not locked, no signal? > > tda829x 2-004b: tda8290 not locked, no signal? > > tda829x 2-004b: adjust gain, step 1. Agc: 193, ADC stat: 255, lock: 0 > > tda829x 2-004b: adjust gain, step 2. Agc: 255, lock: 0 > > tda829x 2-004b: adjust gain, step 3. Agc: 173 > > > > During that, the sound is good. Then it turns into noise. > > When I increased the number of lock detections in tda8290_set_params() > > from 3 to (e.g.) 10, it works longer. And when I'm quick enough to stop > > the console output using scroll lock, the radio remains working. > > Pinnacle radio problems turned out to be a different bug - the driver turns > off tuners when the radio device is closed - and I was testing using > v4l2-ctl. Fixing that allows Pinnacle to work fine. > > But it's not enough for A706 to work. When I disable gain adjust in tda8290 > (by putting a return before), strong stations work somehow (with noise). Changing IF frequency from 1.25MHz (1250) to 5.5MHz (5500) in tda18271-maps.c allows the radio to work without disabling gain adjust. Seems that IF mismatch between tda18271 and saa7134 is causing problems. However, only strong stations work. -- Ondrej Zary -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
