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| author |   Ben Dooks <ben.dooks@codethink.co.uk> | 2022-03-18 15:24:30 +0000 |
|---|---|---|
| committer |   Bjorn Helgaas <bhelgaas@google.com> | 2022-03-21 15:19:26 -0500 |
| commit | a382c757ec5ef83137a86125f43a4c43dc2ab50b (patch) | |
| tree | d9781755ecc840886a5f1ce3fc2293aea1fb820d /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | PCI: fu740: Drop redundant '-gpios' from DT GPIO lookup (diff) | |
| download | wireguard-linux-a382c757ec5ef83137a86125f43a4c43dc2ab50b.tar.xz wireguard-linux-a382c757ec5ef83137a86125f43a4c43dc2ab50b.zip | |
PCI: fu740: Force 2.5GT/s for initial device probe
The fu740 PCIe core does not probe any devices on the SiFive Unmatched
board without this fix (or having U-Boot explicitly start the PCIe via
either boot-script or user command). The fix is to start the link at
2.5GT/s speeds and once the link is up then change the maximum speed back
to the default.
The U-Boot driver claims to set the link-speed to 2.5GT/s to get the probe
to work (and U-Boot does print link up at 2.5GT/s) in the following code:
https://source.denx.de/u-boot/u-boot/-/blob/master/drivers/pci/pcie_dw_sifive.c?id=v2022.01#L271
Link: https://lore.kernel.org/r/20220318152430.526320-1-ben.dooks@codethink.co.uk
Signed-off-by: Ben Dooks <ben.dooks@codethink.co.uk>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Palmer Dabbelt <palmer@rivosinc.com>
Diffstat (limited to 'tools/perf/scripts/python/export-to-postgresql.py')
0 files changed, 0 insertions, 0 deletions