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PCI/ASPM: Factor out pcie_wait_for_retrain()

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[ Upstream commit 9c7f136433d26592cb4d9cd00b4e15c33d9797c6 ]

Factor pcie_wait_for_retrain() out from pcie_retrain_link().  No functional
change intended.

[bhelgaas: split out from
https: //lore.kernel.org/r/20230502083923.34562-1-ilpo.jarvinen@linux.intel.com]
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Stable-dep-of: e7e39756363a ("PCI/ASPM: Avoid link retraining race")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Ilpo Järvinen 2023-06-20 14:49:33 -05:00 committed by Greg Kroah-Hartman
parent 8dfeae8082
commit 4d1cd90cea
1 changed files with 18 additions and 12 deletions
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30
drivers/pci/pcie/aspm.c
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@ -193,10 +193,26 @@ static void pcie_clkpm_cap_init(struct pcie_link_state *link, int blacklist)
link->clkpm_disable = blacklist ? 1 : 0;
}
static int pcie_wait_for_retrain(struct pci_dev *pdev)
{
unsigned long end_jiffies;
u16 reg16;
/* Wait for Link Training to be cleared by hardware */
end_jiffies = jiffies + LINK_RETRAIN_TIMEOUT;
do {
pcie_capability_read_word(pdev, PCI_EXP_LNKSTA, &reg16);
if (!(reg16 & PCI_EXP_LNKSTA_LT))
return 0;
msleep(1);
} while (time_before(jiffies, end_jiffies));
return -ETIMEDOUT;
}
static int pcie_retrain_link(struct pcie_link_state *link)
{
struct pci_dev *parent = link->pdev;
unsigned long end_jiffies;
u16 reg16;
pcie_capability_read_word(parent, PCI_EXP_LNKCTL, &reg16);
@ -212,17 +228,7 @@ static int pcie_retrain_link(struct pcie_link_state *link)
pcie_capability_write_word(parent, PCI_EXP_LNKCTL, reg16);
}
/* Wait for link training end. Break out after waiting for timeout */
end_jiffies = jiffies + LINK_RETRAIN_TIMEOUT;
do {
pcie_capability_read_word(parent, PCI_EXP_LNKSTA, &reg16);
if (!(reg16 & PCI_EXP_LNKSTA_LT))
break;
msleep(1);
} while (time_before(jiffies, end_jiffies));
if (reg16 & PCI_EXP_LNKSTA_LT)
return -ETIMEDOUT;
return 0;
return pcie_wait_for_retrain(parent);
}
/*