dw_pcie_setup_rc(), as its name indicates, setups the RC. But current
dw_pcie_host_init() also contains some necessary rc setup code.
Another reason: the host may lost power during suspend to ram, the RC
need to be re-setup after resume. The rc can't be correctly resumed
without the rc setup code in dw_pcie_host_init().
So this patch moves the code to dw_pcie_setup_rc() to address the above
two issues. After this patch, each pcie designware driver users could
call dw_pcie_setup_rc() to re-setup rc when resume back.
Signed-off-by: Jisheng Zhang <jszh...@marvell.com>
---
Since v1:
- fix gcc warning found by lkp, thanks
drivers/pci/host/pcie-designware.c | 39 +++++++++++++++++++-------------------
1 file changed, 19 insertions(+), 20 deletions(-)
diff --git a/drivers/pci/host/pcie-designware.c
b/drivers/pci/host/pcie-designware.c
index a4cccd3..261e4a11 100644
--- a/drivers/pci/host/pcie-designware.c
+++ b/drivers/pci/host/pcie-designware.c
@@ -434,7 +434,6 @@ int dw_pcie_host_init(struct pcie_port *pp)
struct platform_device *pdev = to_platform_device(pp->dev);
struct pci_bus *bus, *child;
struct resource *cfg_res;
- u32 val;
int i, ret;
LIST_HEAD(res);
struct resource_entry *win;
@@ -544,25 +543,6 @@ int dw_pcie_host_init(struct pcie_port *pp)
if (pp->ops->host_init)
pp->ops->host_init(pp);
- /*
- * If the platform provides ->rd_other_conf, it means the platform
- * uses its own address translation component rather than ATU, so
- * we should not program the ATU here.
- */
- if (!pp->ops->rd_other_conf)
- dw_pcie_prog_outbound_atu(pp, PCIE_ATU_REGION_INDEX1,
- PCIE_ATU_TYPE_MEM, pp->mem_base,
- pp->mem_bus_addr, pp->mem_size);
-
- dw_pcie_wr_own_conf(pp, PCI_BASE_ADDRESS_0, 4, 0);
-
- /* program correct class for RC */
- dw_pcie_wr_own_conf(pp, PCI_CLASS_DEVICE, 2, PCI_CLASS_BRIDGE_PCI);
-
- dw_pcie_rd_own_conf(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, 4, &val);
- val |= PORT_LOGIC_SPEED_CHANGE;
- dw_pcie_wr_own_conf(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, 4, val);
-
pp->root_bus_nr = pp->busn->start;
if (IS_ENABLED(CONFIG_PCI_MSI)) {
bus = pci_scan_root_bus_msi(pp->dev, pp->root_bus_nr,
@@ -800,6 +780,25 @@ void dw_pcie_setup_rc(struct pcie_port *pp)
val |= PCI_COMMAND_IO | PCI_COMMAND_MEMORY |
PCI_COMMAND_MASTER | PCI_COMMAND_SERR;
dw_pcie_writel_rc(pp, val, PCI_COMMAND);
+
+ /*
+ * If the platform provides ->rd_other_conf, it means the platform
+ * uses its own address translation component rather than ATU, so
+ * we should not program the ATU here.
+ */
+ if (!pp->ops->rd_other_conf)
+ dw_pcie_prog_outbound_atu(pp, PCIE_ATU_REGION_INDEX1,
+ PCIE_ATU_TYPE_MEM, pp->mem_base,
+ pp->mem_bus_addr, pp->mem_size);
+
+ dw_pcie_wr_own_conf(pp, PCI_BASE_ADDRESS_0, 4, 0);
+
+ /* program correct class for RC */
+ dw_pcie_wr_own_conf(pp, PCI_CLASS_DEVICE, 2, PCI_CLASS_BRIDGE_PCI);
+
+ dw_pcie_rd_own_conf(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, 4, &val);
+ val |= PORT_LOGIC_SPEED_CHANGE;
+ dw_pcie_wr_own_conf(pp, PCIE_LINK_WIDTH_SPEED_CONTROL, 4, val);
}
MODULE_AUTHOR("Jingoo Han <jg1....@samsung.com>");
--
2.7.0
