[PATCH 3/5] PCI: brcmstb: enable CRS

[Jim Quinlan]

From: Jim Quinlan <jquinlan@xxxxxxxxxxxx>

Configuration Retry Request Status is off by default on this
PCIe controller.  Turn it on.

Signed-off-by: Jim Quinlan <jquinlan@xxxxxxxxxxxx>
---
 drivers/pci/controller/pcie-brcmstb.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/pci/controller/pcie-brcmstb.c b/drivers/pci/controller/pcie-brcmstb.c
index 5b0dec5971b8..2bc913c0262c 100644
--- a/drivers/pci/controller/pcie-brcmstb.c
+++ b/drivers/pci/controller/pcie-brcmstb.c
@@ -34,6 +34,9 @@
 #define BRCM_PCIE_CAP_REGS				0x00ac
 
 /* Broadcom STB PCIe Register Offsets */
+#define PCIE_RC_CFG_PCIE_ROOT_CAP_CONTROL			0x00c8
+#define  PCIE_RC_CFG_PCIE_ROOT_CAP_CONTROL_RC_CRS_EN_MASK	0x10
+
 #define PCIE_RC_CFG_VENDOR_VENDOR_SPECIFIC_REG1				0x0188
 #define  PCIE_RC_CFG_VENDOR_VENDOR_SPECIFIC_REG1_ENDIAN_MODE_BAR2_MASK	0xc
 #define  PCIE_RC_CFG_VENDOR_SPCIFIC_REG1_LITTLE_ENDIAN			0x0
@@ -827,6 +830,12 @@ static int brcm_pcie_setup(struct brcm_pcie *pcie)
 		 pci_speed_string(pcie_link_speed[cls]), nlw,
 		 ssc_good ? "(SSC)" : "(!SSC)");
 
+	/* Enable configuration request retry (CRS) */
+	tmp = readl(base + PCIE_RC_CFG_PCIE_ROOT_CAP_CONTROL);
+	u32p_replace_bits(&tmp, 1,
+			  PCIE_RC_CFG_PCIE_ROOT_CAP_CONTROL_RC_CRS_EN_MASK);
+	writel(tmp, base + PCIE_RC_CFG_PCIE_ROOT_CAP_CONTROL);
+
 	/* PCIe->SCB endian mode for BAR */
 	tmp = readl(base + PCIE_RC_CFG_VENDOR_VENDOR_SPECIFIC_REG1);
 	u32p_replace_bits(&tmp, PCIE_RC_CFG_VENDOR_SPCIFIC_REG1_LITTLE_ENDIAN,
-- 
2.17.1