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pci_ep: layerscape: Add the workaround for errata A-009460

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The VF_BARn_REG register's Prefetchable and Type bit fields
are overwritten by a write to VF's BAR Mask register.
workaround: Before writing to the VF_BARn_MASK_REG register,
write 0b to the PCIE_MISC_CONTROL_1_OFF register.

Signed-off-by: Xiaowei Bao <xiaowei.bao@nxp.com>
Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
This commit is contained in:
Xiaowei Bao 2020-07-09 23:31:37 +08:00 committed by Priyanka Jain
parent c5174a52c2
commit 15ce1fadf7
1 changed files with 9 additions and 0 deletions
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9
drivers/pci/pcie_layerscape_ep.c
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@ -164,6 +164,15 @@ static void ls_pcie_setup_ep(struct ls_pcie_ep *pcie_ep)
if (PCI_EXT_CAP_ID(sriov) == PCI_EXT_CAP_ID_SRIOV) {
pcie_ep->sriov_flag = 1;
for (pf = 0; pf < PCIE_PF_NUM; pf++) {
/*
* The VF_BARn_REG register's Prefetchable and Type bit
* fields are overwritten by a write to VF's BAR Mask
* register. Before writing to the VF_BARn_MASK_REG
* register, write 0b to the PCIE_MISC_CONTROL_1_OFF
* register.
*/
writel(0, pcie->dbi + PCIE_MISC_CONTROL_1_OFF);
if (pcie_ep->cfg2_flag) {
for (vf = 0; vf <= PCIE_VF_NUM; vf++) {
ctrl_writel(pcie,