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| author | Bjorn Helgaas <bhelgaas@google.com> | 2014-09-03 13:26:29 -0600 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2014-09-12 20:11:41 -0600 |
| commit | 302328c00341f1c161bfe32d085d3e6549a08f2d (patch) | |
| tree | b3094ed56418eea159beddd2224d40d51d6b4838 | |
| parent | ca0647e08acd327d508c0fa4553c2148dc7e08b4 (diff) | |
| download | linux-302328c00341f1c161bfe32d085d3e6549a08f2d.tar.gz | |
PCI: Preserve MPS and MRRS when applying _HPX settings
Linux manages MPS and MRRS settings to keep them consistent across the PCIe
fabric. BIOS doesn't participate in this Linux management, so ignore that
part of any _HPX settings it supplies.
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Yinghai Lu <yinghai@kernel.org>
| -rw-r--r-- | drivers/pci/probe.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index 1ff2105ba401..cb411fbb6435 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -1301,6 +1301,16 @@ static void program_hpp_type2(struct pci_dev *dev, struct hpp_type2 *hpp) return; } + /* + * Don't allow _HPX to change MPS or MRRS settings. We manage + * those to make sure they're consistent with the rest of the + * platform. + */ + hpp->pci_exp_devctl_and |= PCI_EXP_DEVCTL_PAYLOAD | + PCI_EXP_DEVCTL_READRQ; + hpp->pci_exp_devctl_or &= ~(PCI_EXP_DEVCTL_PAYLOAD | + PCI_EXP_DEVCTL_READRQ); + /* Initialize Device Control Register */ pcie_capability_clear_and_set_word(dev, PCI_EXP_DEVCTL, ~hpp->pci_exp_devctl_and, hpp->pci_exp_devctl_or); |