[U-Boot] [PATCH 2/2] pci: layerscape: Add the workaround for errata A-009460

[Xiaowei Bao]

From: Xiaowei Bao <xiaowei.bao at nxp.com>

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.c |    9 +++++++++
 drivers/pci/pcie_layerscape.h |    1 +
 2 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/drivers/pci/pcie_layerscape.c b/drivers/pci/pcie_layerscape.c
index 1b082da..7ba3c1d 100644
--- a/drivers/pci/pcie_layerscape.c
+++ b/drivers/pci/pcie_layerscape.c
@@ -450,6 +450,15 @@ static void ls_pcie_setup_ep(struct ls_pcie *pcie)
 	if (PCI_EXT_CAP_ID(sriov) == PCI_EXT_CAP_ID_SRIOV) {
 		pcie->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->cfg2_flag) {
 				for (vf = 0; vf <= PCIE_VF_NUM; vf++) {
 					ctrl_writel(pcie,
diff --git a/drivers/pci/pcie_layerscape.h b/drivers/pci/pcie_layerscape.h
index 9038d32..067dd3c 100644
--- a/drivers/pci/pcie_layerscape.h
+++ b/drivers/pci/pcie_layerscape.h
@@ -94,6 +94,7 @@
 #define PCIE_BAR4_SIZE		SZ_1M /* 1M */
 
 #define PCIE_SRIOV_VFBAR0	0x19C
+#define PCIE_MISC_CONTROL_1_OFF	0x8BC
 #define PCIE_CTRL1_FUNC_NUM	0x00100000
 
 #define PCIE_MASK_OFFSET(flag, pf) ((flag) ? 0 : (0x1000 + 0x20000 * (pf)))
-- 
1.7.1