diff options
| author | Stephen Carlson <[email protected]> | 2023-03-10 11:07:13 -0800 |
|---|---|---|
| committer | Tom Rini <[email protected]> | 2023-03-30 15:09:59 -0400 |
| commit | 59b1c9be01934222cf773b35de7c8d086dabaef6 (patch) | |
| tree | f56283a9ea04afe388987fb53faf873336bb6d84 /cmd/Kconfig | |
| parent | 19213d7a65e9e3f8cfd0852599170636c894169e (diff) | |
cmd: pci: Add command to set MPS of all PCIe devices
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 <[email protected]>
Diffstat (limited to 'cmd/Kconfig')
| -rw-r--r-- | cmd/Kconfig | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/cmd/Kconfig b/cmd/Kconfig index ba5ec69293f..8138ab98eab 100644 --- a/cmd/Kconfig +++ b/cmd/Kconfig @@ -1396,6 +1396,16 @@ config CMD_PCI peripherals. Sub-commands allow bus enumeration, displaying and changing configuration space and a few other features. +config CMD_PCI_MPS + bool "pci_mps - Configure PCI device MPS" + depends on PCI + help + Enables PCI Express Maximum Packet Size (MPS) tuning. This + command configures the PCI Express MPS of each endpoint to the + largest value supported by all devices below the root complex. + The Maximum Read Request Size will not be altered. This method is + the same algorithm as used by Linux pci=pcie_bus_safe. + config CMD_PINMUX bool "pinmux - show pins muxing" depends on PINCTRL |