pci_ep: layerscape: Add the workaround for errata A-009460
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>
diff --git a/drivers/pci/pcie_layerscape_ep.c b/drivers/pci/pcie_layerscape_ep.c
index e609607..3f22c5e 100644
--- a/drivers/pci/pcie_layerscape_ep.c
+++ b/drivers/pci/pcie_layerscape_ep.c
@@ -164,6 +164,15 @@
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,