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[4/4] PCI: rockchip: reconfigure configuration space header type

Message ID 1493864691-102523-4-git-send-email-shawn.lin@rock-chips.com (mailing list archive)
State New, archived
Headers show

Commit Message

Shawn Lin May 4, 2017, 2:24 a.m. UTC 
Per PCIe base specification(Revision 3.1a), section 7.5.3,
type 1 configuration space header should be used when accessing
PCIe switch. So we need to reconfigure the header according to
the bus number we are accessing. Otherwise we could not visit the
buses behind the switch.

Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
---

 drivers/pci/host/pcie-rockchip.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)
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Patch

diff --git a/drivers/pci/host/pcie-rockchip.c b/drivers/pci/host/pcie-rockchip.c
index 76bb508..b2d7e53 100644
--- a/drivers/pci/host/pcie-rockchip.c
+++ b/drivers/pci/host/pcie-rockchip.c
@@ -380,6 +380,13 @@  static int rockchip_pcie_rd_other_conf(struct rockchip_pcie *rockchip,
 		return PCIBIOS_BAD_REGISTER_NUMBER;
 	}
 
+	if (bus->parent->number == rockchip->root_bus_nr)
+		rockchip_pcie_cfg_configuration_accesses(rockchip,
+						AXI_WRAPPER_TYPE0_CFG);
+	else
+		rockchip_pcie_cfg_configuration_accesses(rockchip,
+						AXI_WRAPPER_TYPE1_CFG);
+
 	if (size == 4) {
 		*val = readl(rockchip->reg_base + busdev);
 	} else if (size == 2) {
@@ -404,6 +411,13 @@  static int rockchip_pcie_wr_other_conf(struct rockchip_pcie *rockchip,
 	if (!IS_ALIGNED(busdev, size))
 		return PCIBIOS_BAD_REGISTER_NUMBER;
 
+	if (bus->parent->number == rockchip->root_bus_nr)
+		rockchip_pcie_cfg_configuration_accesses(rockchip,
+						AXI_WRAPPER_TYPE0_CFG);
+	else
+		rockchip_pcie_cfg_configuration_accesses(rockchip,
+						AXI_WRAPPER_TYPE1_CFG);
+
 	if (size == 4)
 		writel(val, rockchip->reg_base + busdev);
 	else if (size == 2)