arm64: dts: rockchip: Update RK3399 PCI host bridge window to 32-bit address memory
authorPunit Agrawal <punitagrawal@gmail.com>
Mon, 7 Jun 2021 11:28:56 +0000 (20:28 +0900)
committerHeiko Stuebner <heiko@sntech.de>
Fri, 11 Jun 2021 21:44:00 +0000 (23:44 +0200)
commit8efe01b4386ab38a36b99cfdc1dc02c38a8898c3
treeb41f84e49c609d0b91fbd65aa967032d9d8a124e
parent6efb943b8616ec53a5e444193dccf1af9ad627b5
arm64: dts: rockchip: Update RK3399 PCI host bridge window to 32-bit address memory

The PCIe host bridge on RK3399 advertises a single 64-bit memory
address range even though it lies entirely below 4GB.

Previously the OF PCI range parser treated 64-bit ranges more
leniently (i.e., as 32-bit), but since commit 9d57e61bf723 ("of/pci:
Add IORESOURCE_MEM_64 to resource flags for 64-bit memory addresses")
the code takes a stricter view and treats the ranges as advertised in
the device tree (i.e, as 64-bit).

The change in behaviour causes failure when allocating bus addresses
to devices connected behind a PCI-to-PCI bridge that require
non-prefetchable memory ranges. The allocation failure was observed
for certain Samsung NVMe drives connected to RockPro64 boards.

Update the host bridge window attributes to treat it as 32-bit address
memory. This fixes the allocation failure observed since commit
9d57e61bf723.

Reported-by: Alexandru Elisei <alexandru.elisei@arm.com>
Link: https://lore.kernel.org/r/7a1e2ebc-f7d8-8431-d844-41a9c36a8911@arm.com
Suggested-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Punit Agrawal <punitagrawal@gmail.com>
Tested-by: Alexandru Elisei <alexandru.elisei@arm.com>
Link: https://lore.kernel.org/r/20210607112856.3499682-5-punitagrawal@gmail.com
Signed-off-by: Heiko Stuebner <heiko@sntech.de>
arch/arm64/boot/dts/rockchip/rk3399.dtsi