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path: root/drivers/ntb/hw/intel/ntb_hw_gen4.c
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Diffstat (limited to 'drivers/ntb/hw/intel/ntb_hw_gen4.c')
-rw-r--r--drivers/ntb/hw/intel/ntb_hw_gen4.c27
1 files changed, 26 insertions, 1 deletions
diff --git a/drivers/ntb/hw/intel/ntb_hw_gen4.c b/drivers/ntb/hw/intel/ntb_hw_gen4.c
index bc4541cbf8c6..fede05151f69 100644
--- a/drivers/ntb/hw/intel/ntb_hw_gen4.c
+++ b/drivers/ntb/hw/intel/ntb_hw_gen4.c
@@ -177,8 +177,10 @@ int gen4_init_dev(struct intel_ntb_dev *ndev)
ndev->reg = &gen4_reg;
- if (pdev_is_ICX(pdev))
+ if (pdev_is_ICX(pdev)) {
ndev->hwerr_flags |= NTB_HWERR_BAR_ALIGN;
+ ndev->hwerr_flags |= NTB_HWERR_LTR_BAD;
+ }
ppd1 = ioread32(ndev->self_mmio + GEN4_PPD1_OFFSET);
ndev->ntb.topo = gen4_ppd_topo(ndev, ppd1);
@@ -431,6 +433,25 @@ static int intel_ntb4_link_enable(struct ntb_dev *ntb,
dev_dbg(&ntb->pdev->dev,
"ignoring max_width %d\n", max_width);
+ if (!(ndev->hwerr_flags & NTB_HWERR_LTR_BAD)) {
+ u32 ltr;
+
+ /* Setup active snoop LTR values */
+ ltr = NTB_LTR_ACTIVE_REQMNT | NTB_LTR_ACTIVE_VAL | NTB_LTR_ACTIVE_LATSCALE;
+ /* Setup active non-snoop values */
+ ltr = (ltr << NTB_LTR_NS_SHIFT) | ltr;
+ iowrite32(ltr, ndev->self_mmio + GEN4_LTR_ACTIVE_OFFSET);
+
+ /* Setup idle snoop LTR values */
+ ltr = NTB_LTR_IDLE_VAL | NTB_LTR_IDLE_LATSCALE | NTB_LTR_IDLE_REQMNT;
+ /* Setup idle non-snoop values */
+ ltr = (ltr << NTB_LTR_NS_SHIFT) | ltr;
+ iowrite32(ltr, ndev->self_mmio + GEN4_LTR_IDLE_OFFSET);
+
+ /* setup PCIe LTR to active */
+ iowrite8(NTB_LTR_SWSEL_ACTIVE, ndev->self_mmio + GEN4_LTR_SWSEL_OFFSET);
+ }
+
ntb_ctl = NTB_CTL_E2I_BAR23_SNOOP | NTB_CTL_I2E_BAR23_SNOOP;
ntb_ctl |= NTB_CTL_E2I_BAR45_SNOOP | NTB_CTL_I2E_BAR45_SNOOP;
iowrite32(ntb_ctl, ndev->self_mmio + ndev->reg->ntb_ctl);
@@ -476,6 +497,10 @@ static int intel_ntb4_link_disable(struct ntb_dev *ntb)
lnkctl |= GEN4_LINK_CTRL_LINK_DISABLE;
iowrite16(lnkctl, ndev->self_mmio + GEN4_LINK_CTRL_OFFSET);
+ /* set LTR to idle */
+ if (!(ndev->hwerr_flags & NTB_HWERR_LTR_BAD))
+ iowrite8(NTB_LTR_SWSEL_IDLE, ndev->self_mmio + GEN4_LTR_SWSEL_OFFSET);
+
ndev->dev_up = 0;
return 0;