[linux-dvb] Re: [BUG] FusionHDTV5 Lite

Hamish Moffatt hamish at cloud.net.au
Mon Sep 12 00:49:08 CEST 2005

On Sun, Sep 11, 2005 at 03:26:34PM -0400, Michael Krufky wrote:
> Manu Abraham wrote:
> >Michael Krufky wrote:
> >>>bt878(0): irq FDSR risc_pc=2c4bd008
> >>>bt878(0): irq FDSR risc_pc=2c4bd008
> >>>bt878(0): irq SCERR risc_pc=2c4bd000
> >>>bt878(0): irq FDSR risc_pc=2c4bd008
> >>>[...]
> >>>bt878(0): irq FDSR risc_pc=2c4bd008
> >>>bt878(0): irq FDSR risc_pc=2c4bd008
> >>>bt878(0): IRQ lockup, cleared int mask
> >
> >Looks like you had too many a IRQ's due to FDSR errors, why don't you 
> >try ignoring the FBUS errors
> Manu-
> I applied both of the changes above and it fixes the problem.  ie:

It prevents the lockup, but do you get data stream corruption when the
(now masked) interrupts occur? The buffers in the BT878 overflowed
causing the interrupt, and ignoring the interrupt won't prevent the
buffers from overflowing.

(Potentially it might, actually. Logging the interrupts may be making
the PCI latency longer, especially if syslog is flushing each line to
disk rather than allowing the write-back cache to handle it.)

IMHO the BT878 buffer is too small, as it's not designed for this
application. The CX2388x chips have much larger buffers.

Hamish Moffatt VK3SB <hamish at debian.org> <hamish at cloud.net.au>

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