[PATCH 5/9] pci_ep: layerscape: Add the workaround for errata A-009460

[Xiaowei Bao]

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 at nxp.com>
---
 drivers/pci/pcie_layerscape_ep.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/pci/pcie_layerscape_ep.c b/drivers/pci/pcie_layerscape_ep.c
index bec374b..a2b18ad 100644
--- a/drivers/pci/pcie_layerscape_ep.c
+++ b/drivers/pci/pcie_layerscape_ep.c
@@ -163,6 +163,15 @@ 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,
-- 
2.9.5