parisc/pci: Switch LBA PCI bus from Hard Fail to Soft Fail mode

parisc/pci: Switch LBA PCI bus from Hard Fail to Soft Fail mode

Carlo Pisani noticed that his C3600 workstation behaved unstable during heavy
I/O on the PCI bus with a VIA VT6421 IDE/SATA PCI card.

To avoid such instability, this patch switches the LBA PCI bus from Hard Fail
mode into Soft Fail mode. In this mode the bus will return -1UL for timed out
MMIO transactions, which is exactly how the x86 (and most other architectures)
PCI busses behave.

This patch is based on a proposal by Grant Grundler and Kyle McMartin 10
years ago:
https://www.spinics.net/lists/linux-parisc/msg01027.html

Cc: Carlo Pisani <[email protected]>
Cc: Kyle McMartin <[email protected]>
Reviewed-by: Grant Grundler <[email protected]>
Signed-off-by: Helge Deller <[email protected]>