PCI: iproc: Invalidate PAXB address mapping before programming it

Browse source

Invalidate PAXB inbound/outbound address mapping on probe before
programming it.

Kernel relies on outbound/inbound windows VALID bit in OARR registers to
detect if a window was programmed and if it is set it does not overwrite
it.

This causes issues on soft reboot (eg kexec) since the host controller
does not go through a HW reset on softboot so the kernel detects valid
outbound/inbound windows configuration and is not able to reprogramme
it as expected.

Therefore, in order to make sure outbound/inbound windows are
reprogrammed on soft reboot (eg kexec), invalidate memory windows on
each probe to fix the issue.

Signed-off-by: Abhishek Shah <abhishek.shah@broadcom.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Ray Jui <ray.jui@broadcom.com>
Reviewed-by: Andrew Murray <andrew.murray@arm.com>

...

This commit is contained in:

Abhishek Shah 2019-09-06 09:28:13 +05:30 • committed by Lorenzo Pieralisi

parent 54ecb8f702

commit 9415743e4c

1 changed files with 28 additions and 0 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

28

drivers/pci/controller/pcie-iproc.c

View file