modifiy the ls_pcie_link_up function, add the following three judging
mechanisms:
detect state: return link down status;
L0 state: return link up status;
other state: delay about 100ms retrieve Status Returns the corresponding link
status;
Signed-off-by: Bao Xiaowei <xiaowei....@nxp.com>
---
drivers/pci/pcie_layerscape.c | 17 +++++++++++++----
1 file changed, 13 insertions(+), 4 deletions(-)
diff --git a/drivers/pci/pcie_layerscape.c b/drivers/pci/pcie_layerscape.c
index 7565e2f..4446ac9 100644
--- a/drivers/pci/pcie_layerscape.c
+++ b/drivers/pci/pcie_layerscape.c
@@ -65,13 +65,22 @@ static int ls_pcie_ltssm(struct ls_pcie *pcie)
static int ls_pcie_link_up(struct ls_pcie *pcie)
{
- int ltssm;
+ int ltssm, i;
ltssm = ls_pcie_ltssm(pcie);
- if (ltssm < LTSSM_PCIE_L0)
+ if ((ltssm == 0) || (ltssm == 1))
return 0;
-
- return 1;
+ else if (ltssm == LTSSM_PCIE_L0)
+ return 1;
+ else {
+ for (i = 0; i < 100; i++) {
+ udelay(1000);
+ ltssm = ls_pcie_ltssm(pcie);
+ if (ltssm == LTSSM_PCIE_L0)
+ return 1;
+ }
+ return 0;
+ }
}
static void ls_pcie_cfg0_set_busdev(struct ls_pcie *pcie, u32 busdev)
--
2.1.0.27.g96db324
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