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[09/15] PCI: mvebu: Setup PCIe controller to Root Complex mode

Message ID 20211125124605.25915-10-pali@kernel.org
State New
Headers show
Series pci: mvebu: Various fixes | expand

Commit Message

Pali Rohár Nov. 25, 2021, 12:45 p.m. UTC 
This driver operates only in Root Complex mode, so ensure that hardware is
properly configured in Root Complex mode.

Signed-off-by: Pali Rohár <pali@kernel.org>
Cc: stable@vger.kernel.org
---
 drivers/pci/controller/pci-mvebu.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)
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Patch

diff --git a/drivers/pci/controller/pci-mvebu.c b/drivers/pci/controller/pci-mvebu.c
index 12afa565bfcf..017ae9f869ac 100644
--- a/drivers/pci/controller/pci-mvebu.c
+++ b/drivers/pci/controller/pci-mvebu.c
@@ -56,6 +56,7 @@ 
 #define  PCIE_MASK_ENABLE_INTS          0x0f000000
 #define PCIE_CTRL_OFF		0x1a00
 #define  PCIE_CTRL_X1_MODE		0x0001
+#define  PCIE_CTRL_RC_MODE		BIT(1)
 #define PCIE_STAT_OFF		0x1a04
 #define  PCIE_STAT_BUS                  0xff00
 #define  PCIE_STAT_DEV                  0x1f0000
@@ -224,7 +225,12 @@  static void mvebu_pcie_setup_wins(struct mvebu_pcie_port *port)
 
 static void mvebu_pcie_setup_hw(struct mvebu_pcie_port *port)
 {
-	u32 cmd, mask;
+	u32 ctrl, cmd, mask;
+
+	/* Setup PCIe controller to Root Complex mode. */
+	ctrl = mvebu_readl(port, PCIE_CTRL_OFF);
+	ctrl |= PCIE_CTRL_RC_MODE;
+	mvebu_writel(port, ctrl, PCIE_CTRL_OFF);
 
 	/* Disable Root Bridge I/O space, memory space and bus mastering. */
 	cmd = mvebu_readl(port, PCIE_CMD_OFF);