[linux-dvb] Re: AverMedia DVB-T 771 problems

[Jolse Maginnis <jmaginni@primus.com.au>]

Hi Wolfram, 

> > I know that the frequency is correct because i noted the frequencies for
> > the channels in windows.
> 
> Did you check the other paramters, too? AFAIK wrong settings for the bandwidth  
> cannot be corrected automaticaly.

Doesn't the driver set the tuner bandwidth based on the frequency?

> > the read of register 0x00 returns the same as the read of register 0x7f!
> 
> I don't know what's going on. If I read the CHIP_ID-register before the 
> status-register, all works well:
> 
> 0x7F: 13
> 0x00: 00
> 0x7F: 13
> 0x00: 01
> 0x7F: 13
> 0x00: 3B
> 0x7F: 13
> 0x00: FB

Here's a sample of what I get while tzap is running, this is also with a 
read of 0x7f at the end of FE_READ_STATUS

Reg 00 = 13
Reg 01 = 00
Reg 03 = 7c
Reg 7f = 13
Reg 12 = 13
Reg 13 = 13
Reg 09 = 13
Reg 7f = 13
Reg 0d = 00
Reg 0e = 00
Reg 0f = 00
Reg 10 = 00
Reg 11 = 00
Reg 00 = 00
Reg 01 = 00
Reg 03 = 7c
Reg 7f = 13
Reg 00 = 13
Reg 01 = 00
Reg 03 = 74
Reg 7f = 13
Reg 12 = 13
Reg 13 = 13
Reg 09 = 13
Reg 7f = 13
Reg 0d = 00
Reg 0e = 00
Reg 0f = 00
Reg 10 = 00
Reg 11 = 00

as you can see reads of 00, 12,13 & 09 just return whatever was read before it.

Surely this is a fault with the i2c driver?
This is what i get when bttv is started:

bttv: driver version 0.9.14 loaded
bttv: using 8 buffers with 2080k (520 pages) each for capture
bttv: Bt8xx card found (0).
bttv0: Bt878 (rev 17) at 0000:02:06.0, irq: 17, latency: 64, mmio: 0xea100000
bttv0: detected: AverMedia DVB-T 771 [card=121], PCI subsystem ID is 1461:0771
bttv0: using: AVerMedia AVerTV DVB-T 771 [card=121,autodetected]
bttv0: gpio: en=00000000, out=00000000 in=0098008f [init]
bttv0: using tuner=-1
bttv0: registered device video0
bttv0: registered device vbi0
bttv0: PLL: 28636363 => 35468950 . ok
bttv0: add subdevice "remote0"
bttv0: add subdevice "dvb0"

I use:
bttv i2c_hw=1
to make sure it's using hardware i2c.

and I use the modules i2c_core and i2c_algo_bit.
I don't know much about the i2c modules, should I be using a different 
module other than i2c_algo_bit? Is it dependant on the motherboard?

Jolse