[PATCH] arm: pci: mark the dra7xx driver as broken

On Thu, Jan 7, 2016 at 3:25 AM, Richard Cochran
[off-list ref] wrote:

On Thu, Jan 07, 2016 at 02:14:22PM +0530, Kishon Vijay Abraham I wrote:

quoted

In my point of view the driver is not broken as such but an independent piece
(reset) which is missing, since this driver compiles and works fine if that
reset piece is added. You are right in that this shouldn't have been probed
since it's known that the reset piece is missing. Maybe we should just set
"status = disabled" in dra7.dtsi and when that reset piece is added enable it
back in dra7-evm.dts?

That isn't strong enough, IMHO, since status=disabled is the default
for most every DTS item.  Maybe you could comment the PCI block out or
remove it and put a comment in about the missing piece and the lock up
behavior.  It is really a nasty bug to have the machine freeze up with
no output at all.  It took me some time to figure out what was going
on, and it would be a shame if someone else sets status=okay in their
board file and has to repeat the whole exercise.

It sounds like dra7xx is missing a piece of essential functionality.
If that's the case, what is the benefit of having it in the kernel at
all?  It makes work for everybody else (adapting to changes outside
the driver), but it sounds like nobody gets any benefit.

If somebody posts a patch to remove the driver entirely to
linux-pci at vger.kernel.org, we can discuss whether that's the right
thing to do.

Bjorn