* Re: [PATCH 2/2] ppc64: Add arch-specific pcie_get_speed_cap_mask
[not found] ` <1363283147-8852-3-git-send-email-lucaskt@linux.vnet.ibm.com>
@ 2013-03-14 18:52 ` Thadeu Lima de Souza Cascardo
0 siblings, 0 replies; only message in thread
From: Thadeu Lima de Souza Cascardo @ 2013-03-14 18:52 UTC (permalink / raw)
To: lucaskt
Cc: linux-pci, linuxppc-dev, dri-devel, brking, Alex Deucher,
Bjorn Helgaas
On Thu, Mar 14, 2013 at 02:45:47PM -0300, lucaskt@linux.vnet.ibm.com wrote:
> From: Lucas Kannebley Tavares <lucaskt@linux.vnet.ibm.com>
>
> Betters support for gen2 speed detections on PCI buses on ppc64
> architectures.
>
> Signed-off-by: Lucas Kannebley Tavares <lucaskt@linux.vnet.ibm.com>
> ---
> arch/powerpc/platforms/pseries/pci.c | 32 ++++++++++++++++++++++++++++++++
> 1 files changed, 32 insertions(+), 0 deletions(-)
>
> diff --git a/arch/powerpc/platforms/pseries/pci.c b/arch/powerpc/platforms/pseries/pci.c
> index 0b580f4..58469fe 100644
> --- a/arch/powerpc/platforms/pseries/pci.c
> +++ b/arch/powerpc/platforms/pseries/pci.c
> @@ -24,6 +24,7 @@
> #include <linux/kernel.h>
> #include <linux/pci.h>
> #include <linux/string.h>
> +#include <linux/device.h>
>
> #include <asm/eeh.h>
> #include <asm/pci-bridge.h>
> @@ -108,3 +109,34 @@ static void fixup_winbond_82c105(struct pci_dev* dev)
> }
> DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_WINBOND, PCI_DEVICE_ID_WINBOND_82C105,
> fixup_winbond_82c105);
> +
> +int pcibios_get_speed_cap_mask(struct pci_dev *dev, u32 *mask)
> +{
> + struct device_node *dn, *pdn;
> + const uint32_t *pcie_link_speed_stats = NULL;
> +
> + *mask = 0;
> + dn = pci_bus_to_OF_node(dev->bus);
> +
> + /* Find nearest ibm,pcie-link-speed-stats, walking up the device tree */
> + for (pdn = dn; pdn != NULL; pdn = pdn->parent) {
> + pcie_link_speed_stats = (const uint32_t *) of_get_property(pdn,
> + "ibm,pcie-link-speed-stats", NULL);
> + if (pcie_link_speed_stats != NULL)
> + break;
> + }
> +
> + if (pcie_link_speed_stats == NULL) {
> + dev_info(&dev->dev, "no ibm,pcie-link-speed-stats property\n");
> + return -EINVAL;
> + }
> +
> + switch (pcie_link_speed_stats[0]) {
> + case 0x02:
> + *mask |= PCIE_SPEED_50;
> + case 0x01:
> + *mask |= PCIE_SPEED_25;
> + }
I recall seeing this returns 0x00 as well. Maybe you should include both
0x00 and a default case and return EINVAL.
Regards.
Cascardo.
> +
> + return 0;
> +}
> --
> 1.7.4.4
>
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