[U-Boot] [PATCH] armv8: layerscape platform pcie link up state judgment strongly

[Bao Xiaowei]

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.bao at 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