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staging/rdma/hfi1: Enable WFR PCIe extended tags from the driver

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Some BIOS implementations turn off extended tags in DevCtl (a RW
field) even though it was originally set and is advertised in DevCap
Fix is to set it in the driver

Reviewed-by: Dean Luick <dean.luick@intel.com>
Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Reviewed-by: Ashutosh Dixit <ashutosh.dixit@intel.com>
Signed-off-by: Vennila Megavannan <vennila.megavannan@intel.com>
Signed-off-by: Jubin John <jubin.john@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Vennila Megavannan 2015-11-06 20:06:58 -05:00 committed by Greg Kroah-Hartman
parent 72a67ba2fa
commit bf70a77577
1 changed files with 11 additions and 1 deletions
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12
drivers/staging/rdma/hfi1/pcie.c
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@ -467,8 +467,18 @@ static void tune_pcie_caps(struct hfi1_devdata *dd)
{
struct pci_dev *parent;
u16 rc_mpss, rc_mps, ep_mpss, ep_mps;
u16 rc_mrrs, ep_mrrs, max_mrrs;
u16 rc_mrrs, ep_mrrs, max_mrrs, ectl;
/*
* Turn on extended tags in DevCtl in case the BIOS has turned it off
* to improve WFR SDMA bandwidth
*/
pcie_capability_read_word(dd->pcidev, PCI_EXP_DEVCTL, &ectl);
if (!(ectl & PCI_EXP_DEVCTL_EXT_TAG)) {
dd_dev_info(dd, "Enabling PCIe extended tags\n");
ectl |= PCI_EXP_DEVCTL_EXT_TAG;
pcie_capability_write_word(dd->pcidev, PCI_EXP_DEVCTL, ectl);
}
/* Find out supported and configured values for parent (root) */
parent = dd->pcidev->bus->self;
if (!pci_is_root_bus(parent->bus)) {