[linux-dvb] Re: Hauppauge Nova-T Problems

[Ed Wildgoose <ed@wildgooses.com>]

Hmm, this is interesting.  Is the driver developer watching this?

I wonder if we could get some more input on whether this is a good 
generally accepted practice anyway.  I have a semi solution for my 
problems, and like for Robert it involves dropping these figures down to 
something more reasonable

Ed W

John Knottenbelt wrote:

> Well, I notice that av7110.c (at least in the 2.6.0-test3 kernel) writes:
>
> ./ttpci/av7110.c:       saa7146_write(dev, PCI_BT_V1, 0x1c00101f);
>
> and
>
> ./ttpci/budget-core.c:        saa7146_write(dev, PCI_BT_V1, 0x001c0000 |
> ./ttpci/budget-core.c:            (saa7146_read(dev, PCI_BT_V1) & 
> ~0x001f0000));
>
> Assuming that budget-core write happens after av7110 then the mask is:
>
>    0x1c00101f
> |   0x001c0000
> = 0x1c1c101f
>
> Which I believe decodes to:
> FIFO Threshold   1: 32 dwords
> PCI Burst length 1:  128 dwords
> FIFO Threshold   2: 4 dwords
> PCI Burst length 2:  16 dwords
> FIFO Threshold   3: 4 dwords
> PCI Burst length 3:  128 dwords
> PCI Burst length DEBI:  128 dwords
>
> So it appears that Budget cards are using 128 dwords for DEBI PCI Burst 
> Length.
>
> According to Robert's previous message 128 dwords might be too long for some 
> chipsets? 
> How can we tell if the chipset can handle these parameters?
>  



--
Info:
To unsubscribe send a mail to ecartis@linuxtv.org with "unsubscribe linux-dvb" as subject.