Hi Heiko,

Heiko Stübner [off-list ref] writes:

Hi,

Am Montag, 7. Juni 2021, 13:28:56 CEST schrieb Punit Agrawal:

quoted

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 <redacted>
Link: https://lore.kernel.org/r/7a1e2ebc-f7d8-8431-d844-41a9c36a8911@arm.com (local)
Suggested-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Punit Agrawal <redacted>
Tested-by: Alexandru Elisei <redacted>
Cc: Heiko Stuebner <heiko@sntech.de>
Cc: Rob Herring <robh+dt@kernel.org>

just for clarity, should I just pick this patch separately for 5.13-rc to
make it easy for people using current kernel devicetrees, or should
this wait for the update mentioned in the cover-letter response
and should go all together through the PCI tree?

The device tree change is independent of the other patches in the
series. It would be great if you can pick this one - I am waiting on
feedback from Rob before sending an update on the remaining patches.

Thanks,
Punit

If so, I can provide an
Acked-by: Heiko Stuebner <heiko@sntech.de>

quoted

---
 arch/arm64/boot/dts/rockchip/rk3399.dtsi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/rockchip/rk3399.dtsi b/arch/arm64/boot/dts/rockchip/rk3399.dtsi
index 634a91af8e83..4b854eb21f72 100644
--- a/arch/arm64/boot/dts/rockchip/rk3399.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk3399.dtsi

@@ -227,7 +227,7 @@ pcie0: pcie@f8000000 {
 		       <&pcie_phy 2>, <&pcie_phy 3>;
 		phy-names = "pcie-phy-0", "pcie-phy-1",
 			    "pcie-phy-2", "pcie-phy-3";
-		ranges = <0x83000000 0x0 0xfa000000 0x0 0xfa000000 0x0 0x1e00000>,
+		ranges = <0x82000000 0x0 0xfa000000 0x0 0xfa000000 0x0 0x1e00000>,
 			 <0x81000000 0x0 0xfbe00000 0x0 0xfbe00000 0x0 0x100000>;
 		resets = <&cru SRST_PCIE_CORE>, <&cru SRST_PCIE_MGMT>,
 			 <&cru SRST_PCIE_MGMT_STICKY>, <&cru SRST_PCIE_PIPE>,

_______________________________________________
Linux-rockchip mailing list
Linux-rockchip@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-rockchip

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel