Re: [PATCH v2 1/3] cmd: pci: Add command to set MPS of all PCIe devices

3 Apr 2023


      Thank you Tom!
Stephen Carlson
-----Original Message-----
From: Tom Rini trini@konsulko.com
Sent: Friday, March 31, 2023 7:17 AM
To: stcarlso@linux.microsoft.com
Cc: u-boot@lists.denx.de
Subject: [EXTERNAL] Re: [PATCH v2 1/3] cmd: pci: Add command to set MPS of 
all PCIe devices
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

Stephen Carlson

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