[PATCH v2 8/8] PCI: rzg3s-host: Add 100 ms delay after link training

[Hans Zhang <18255117159@163.com>]

The Renesas RZ/G3S PCIe host driver currently does not enforce the
mandatory 100 ms delay after link training completes for speeds > 5.0 GT/s,
required by PCIe r6.0 sec 6.6.1.

The driver already has a 'max_link_speed' field (derived from the device
tree). Add a call to pcie_wait_after_link_train() in
rzg3s_pcie_host_init() after reading the link status, ensuring that the
delay is applied before any Configuration Request is sent downstream.

Signed-off-by: Hans Zhang <18255117159@163.com>
---
 drivers/pci/controller/pcie-rzg3s-host.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/pci/controller/pcie-rzg3s-host.c b/drivers/pci/controller/pcie-rzg3s-host.c
index d86e7516dcc2..6ab59c5464cf 100644
--- a/drivers/pci/controller/pcie-rzg3s-host.c
+++ b/drivers/pci/controller/pcie-rzg3s-host.c
@@ -1390,6 +1390,8 @@ static int rzg3s_pcie_host_init(struct rzg3s_pcie_host *host)
 	val = readl_relaxed(host->axi + RZG3S_PCI_PCSTAT2);
 	dev_info(host->dev, "PCIe link status [0x%x]\n", val);
 
+	pcie_wait_after_link_train(host->max_link_speed);
+
 	return 0;
 
 config_deinit_post:
-- 
2.34.1