31 Mar
2023
31 Mar
'23
4:16 p.m.
On Fri, Mar 10, 2023 at 11:07:13AM -0800, stcarlso@linux.microsoft.com wrote:
From: Stephen Carlson stcarlso@linux.microsoft.com
Enable tuning of the PCI Express MPS (Maximum Payload Size) of each device. The Maximum Read Request Size is not altered.
The SAFE method uses the largest MPS value supported by all devices in the system for each device. This method is the same algorithm as used by Linux pci=pcie_bus_safe.
The PEER2PEER method sets all devices to the minimal (128 byte) MPS, which allows hot plug of devices later that might only support the minimum size, and ensures compatibility of DMA between two devices on the bus.
Signed-off-by: Stephen Carlson stcarlso@linux.microsoft.com
Applied to u-boot/next, thanks!
--
Tom