[Xen-devel] [PATCH 0/4] ns16550: enable support for Pericom controllers

["Jan Beulich" <JBeulich@xxxxxxxx>]

Patches 1 and 2 are meant to go in. Patch 3 is a prerequisite to patch
4 and may go in as well, but patch 4 is RFC because with the Pericom
board I have MSI doesn't appear to function. Since it also does not
work in baremetal Linux when doing the trivial adjustments needed in
its driver, I suspect the feature doesn't work in general, which is
supported by the observation that the device continues to assert
INTx despite the MSI enable bit being set (causing unclaimed IRQs
until that IRQ gets shut off). While I got some responses back from
Pericom support, no actual statement of whether MSI is actually
known to work on their boards was ever made by them. I _think_
patch 4 is correct (and hence could go in), but I have no way of
proving this by testing.

1: ns16550: store pointer to config parameters for PCI
2: ns16550: enable Pericom controller support
3: console: adjust IRQ initialization
4: ns16550: enable use of PCI MSI

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>

(Konrad, I'd appreciate if you could double check that I didn't
accidentally break the Oxford controller support.)


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