From c659ea7b9d0750eb16fac6ab449055984fd6a24c Mon Sep 17 00:00:00 2001 From: Yurii Monakov Date: Tue, 17 Dec 2019 14:38:36 +0300 Subject: [PATCH] PCI: keystone: Fix link training retries initiation [ Upstream commit 6df19872d881641e6394f93ef2938cffcbdae5bb ] ks_pcie_stop_link() function does not clear LTSSM_EN_VAL bit so link training was not triggered more than once after startup. In configurations where link can be unstable during early boot, for example, under low temperature, it will never be established. Fixes: 0c4ffcfe1fbc ("PCI: keystone: Add TI Keystone PCIe driver") Signed-off-by: Yurii Monakov Signed-off-by: Lorenzo Pieralisi Acked-by: Andrew Murray Cc: stable@vger.kernel.org Signed-off-by: Sasha Levin --- drivers/pci/controller/dwc/pci-keystone-dw.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/pci/controller/dwc/pci-keystone-dw.c b/drivers/pci/controller/dwc/pci-keystone-dw.c index 0682213..15c612e 100644 --- a/drivers/pci/controller/dwc/pci-keystone-dw.c +++ b/drivers/pci/controller/dwc/pci-keystone-dw.c @@ -425,7 +425,7 @@ void ks_dw_pcie_initiate_link_train(struct keystone_pcie *ks_pcie) /* Disable Link training */ val = ks_dw_app_readl(ks_pcie, CMD_STATUS); val &= ~LTSSM_EN_VAL; - ks_dw_app_writel(ks_pcie, CMD_STATUS, LTSSM_EN_VAL | val); + ks_dw_app_writel(ks_pcie, CMD_STATUS, val); /* Initiate Link Training */ val = ks_dw_app_readl(ks_pcie, CMD_STATUS); -- 2.7.4