[linux-dvb] FIX: No recovery after lost lock

Georg Acher acher at in.tum.de
Mon Sep 5 17:15:19 CEST 2005


On Mon, Sep 05, 2005 at 09:43:47AM +0100, Andrew de Quincey wrote:
 
> I don't have any stv099b errata information sorry. All these problems seem
> to be affecting only stv0299b based cards though.

Durung the work on the reelbox driver for the TU1278, I had some strange
lockups of the PLL (TUA6100). Setting a new frequency made the PLL to hang
on one side of its voltage output. It happend especially often on the
Astra transponder with VIVA on it.

To avoid that lockup, the following code just before the actual PLL-settings
in pll_set make that go away:

	{ // GA: Kick PLL to avoid hanging VCO
                u8 xreg0 [2] = { 0x00, 0x0f };
                u8 xreg1 [4] = { 0x01, 0xff, 0xff, 0x00 };
                u8 xreg2 [3] = { 0x02, 0xff, 0xff };
                tua6100_pll_write(fe, 0x60, xreg0, sizeof(xreg0));
                tua6100_pll_write(fe, 0x60, xreg1, sizeof(xreg1));
                tua6100_pll_write(fe, 0x60, xreg2, sizeof(xreg2));
	}

Is it possible that some of the stv0299 related tuning issues actually are
based on this PLL problem? As the driver doesn't read out the PLL lock
status, it may be get totally unrecognised that the PLL and not the stv0299
is the cause...

-- 
         Georg Acher, acher at in.tum.de         
         http://www.lrr.in.tum.de/~acher
         "Oh no, not again !" The bowl of petunias          



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