Re: [PATCH v1] ARM: pci: add call to pcie_bus_configure_settings()

Bjorn Helgaas
2014-05-30T15:45:02Z

On Wed, May 28, 2014 at 01:14:53PM -0400, Murali Karicheri wrote:
> Call pcie_bus_configure_settings on ARM, like for other platforms.
> pcie_bus_configure_settings makes sure the MPS across the bus is
> uniform and provides the ability to tune the MRSS and MPS to higher
> performance values. This is particularly important for embedded where
> there is no firmware to program these PCI-E settings for the OS.
>
> Signed-off-by: Murali Karicheri <m-karicheri2@ti.com>

I applied this to pci/misc for v3.16. Russell, let me know if you object
or prefer another route, and I can drop it. I tweaked the changelog but
didn't touch the actual patch, so I think git will do the right thing if it
arrives via two trees.

> CC: Russell King <linux@arm.linux.org.uk>
> CC: Bjorn Helgaas <bhelgaas@google.com>
> CC: Arnd Bergmann <arnd@arndb.de>
> CC: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
> CC: Santosh Shilimkar <santosh.shilimkar@ti.com>
> ---
> - Fixed comments against initial version
> arch/arm/kernel/bios32.c | 12 ++++++++++++
> 1 file changed, 12 insertions(+)
>
> diff --git a/arch/arm/kernel/bios32.c b/arch/arm/kernel/bios32.c
> index 16d43cd..17a26c1 100644
> --- a/arch/arm/kernel/bios32.c
> +++ b/arch/arm/kernel/bios32.c
> @@ -545,6 +545,18 @@ void pci_common_init_dev(struct device *parent, struct hw_pci *hw)
> */
> pci_bus_add_devices(bus);
> }
> +
> + list_for_each_entry(sys, &head, node) {
> + struct pci_bus *bus = sys->bus;
> +
> + /* Configure PCI Express settings */
> + if (bus && !pci_has_flag(PCI_PROBE_ONLY)) {
> + struct pci_bus *child;
> +
> + list_for_each_entry(child, &bus->children, node)
> + pcie_bus_configure_settings(child);
> + }
> + }
> }
>
> #ifndef CONFIG_PCI_HOST_ITE8152
> --
> 1.7.9.5
>