[PATCH 5.15 070/262] PCI: mvebu: Setup PCIe controller to Root Complex mode

From: Greg Kroah-Hartman
Date: Mon Mar 07 2022 - 05:01:49 EST


From: Pali Rohár <pali@xxxxxxxxxx>

[ Upstream commit df08ac016124bd88b8598ac0599d7b89c0642774 ]

This driver operates only in Root Complex mode, so ensure that hardware is
properly configured in Root Complex mode.

Link: https://lore.kernel.org/r/20211125124605.25915-10-pali@xxxxxxxxxx
Signed-off-by: Pali Rohár <pali@xxxxxxxxxx>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/pci/controller/pci-mvebu.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/controller/pci-mvebu.c b/drivers/pci/controller/pci-mvebu.c
index 76f35d0773b79..e2d4bd8442a80 100644
--- a/drivers/pci/controller/pci-mvebu.c
+++ b/drivers/pci/controller/pci-mvebu.c
@@ -55,6 +55,7 @@
#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
@@ -218,7 +219,12 @@ 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);
--
2.34.1