From: Joao Pinto <joao.pi...@synopsys.com>
Add a default DesignWare "link_up" test for use when a sub-driver doesn't
supply its own pcie_host_ops.link_up() method.
[bhelgaas: changelog, split into its own patch]
Signed-off-by: Joao Pinto <jpi...@synopsys.com>
Signed-off-by: Bjorn Helgaas <bhelg...@google.com>
---
drivers/pci/host/pcie-designware.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/drivers/pci/host/pcie-designware.c
b/drivers/pci/host/pcie-designware.c
index 4fff2d2..d6013a2 100644
--- a/drivers/pci/host/pcie-designware.c
+++ b/drivers/pci/host/pcie-designware.c
@@ -70,6 +70,11 @@
#define PCIE_ATU_FUNC(x) (((x) & 0x7) << 16)
#define PCIE_ATU_UPPER_TARGET 0x91C
+/* PCIe Port Logic registers */
+#define PLR_OFFSET 0x700
+#define PCIE_PHY_DEBUG_R1 (PLR_OFFSET + 0x2c)
+#define PCIE_PHY_DEBUG_R1_LINK_UP 0x00000010
+
static struct pci_ops dw_pcie_ops;
int dw_pcie_cfg_read(void __iomem *addr, int size, u32 *val)
@@ -401,10 +406,13 @@ int dw_pcie_wait_for_link(struct pcie_port *pp)
int dw_pcie_link_up(struct pcie_port *pp)
{
+ u32 val;
+
if (pp->ops->link_up)
return pp->ops->link_up(pp);
- return 0;
+ val = readl(pp->dbi_base + PCIE_PHY_DEBUG_R1);
+ return val & PCIE_PHY_DEBUG_R1_LINK_UP;
}
static int dw_pcie_msi_map(struct irq_domain *domain, unsigned int irq,
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