From: Yurii Monakov monakov.y@gmail.com
[ 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 monakov.y@gmail.com Signed-off-by: Lorenzo Pieralisi lorenzo.pieralisi@arm.com Acked-by: Andrew Murray andrew.murray@arm.com Cc: stable@vger.kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- 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 0682213328e93..15c612e853afb 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);