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Commit bf70a775 authored by Vennila Megavannan's avatar Vennila Megavannan Committed by Greg Kroah-Hartman
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staging/rdma/hfi1: Enable WFR PCIe extended tags from the driver 



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: default avatarDean Luick <dean.luick@intel.com>
Reviewed-by: default avatarMike Marciniszyn <mike.marciniszyn@intel.com>
Reviewed-by: default avatarAshutosh Dixit <ashutosh.dixit@intel.com>
Signed-off-by: default avatarVennila Megavannan <vennila.megavannan@intel.com>
Signed-off-by: default avatarJubin John <jubin.john@intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 72a67ba2

drivers/staging/rdma/hfi1/pcie.c

+11 −1
Original line number Diff line number Diff line
@@ -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)) {