PCI: tegra194: Fix link up retry sequence

stable inclusion
from stable-v5.10.137
commit b1124a2f478f4c5a5b8852129b764fa580248376
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I60PLB

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=b1124a2f478f4c5a5b8852129b764fa580248376

--------------------------------

[ Upstream commit e05fd6ae ]

Add the missing DLF capability offset while clearing DL_FEATURE_EXCHANGE_EN
bit during link up retry.

Link: https://lore.kernel.org/r/20220721142052.25971-15-vidyas@nvidia.com
Fixes: 56e15a23 ("PCI: tegra: Add Tegra194 PCIe support")
Signed-off-by: NVidya Sagar <vidyas@nvidia.com>
Signed-off-by: NBjorn Helgaas <bhelgaas@google.com>
Signed-off-by: NSasha Levin <sashal@kernel.org>
Signed-off-by: NZheng Zengkai <zhengzengkai@huawei.com>
Reviewed-by: NWei Li <liwei391@huawei.com>

drivers/pci/controller/dwc/pcie-tegra194.c

@@ -963,7 +963,7 @@ static int tegra_pcie_dw_host_init(struct pcie_port *pp)
 		offset = dw_pcie_find_ext_capability(pci, PCI_EXT_CAP_ID_DLF);
 		val = dw_pcie_readl_dbi(pci, offset + PCI_DLF_CAP);
 		val &= ~PCI_DLF_EXCHANGE_ENABLE;
-		dw_pcie_writel_dbi(pci, offset, val);
+		dw_pcie_writel_dbi(pci, offset + PCI_DLF_CAP, val);
 
 		tegra_pcie_prepare_host(pp);