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PCI: keystone: Fix link training retries initiation 

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: 0c4ffcfe1f ("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
This commit is contained in:
Yurii Monakov 2019-12-17 14:38:36 +03:00 committed by Lorenzo Pieralisi
parent e42617b825
commit 6df19872d8
1 changed files with 1 additions and 1 deletions
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2
drivers/pci/controller/dwc/pci-keystone.c
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@ -510,7 +510,7 @@ static void ks_pcie_stop_link(struct dw_pcie *pci)
/* Disable Link training */
val = ks_pcie_app_readl(ks_pcie, CMD_STATUS);
val &= ~LTSSM_EN_VAL;
ks_pcie_app_writel(ks_pcie, CMD_STATUS, LTSSM_EN_VAL | val);
ks_pcie_app_writel(ks_pcie, CMD_STATUS, val);
}
static int ks_pcie_start_link(struct dw_pcie *pci)