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PCI: disable ASPM on VIA root-port-under-bridge configurations

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VIA has a strange chipset, it has root port under a bridge. Disable ASPM
for such strange chipset.

Cc: stable@kernel.org
Tested-by: Wolfgang Denk <wd@denx.de>
Signed-off-by: Shaohua Li <shaohua.li@intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Shaohua Li
2009-06-08 09:27:25 +08:00
committed by Jesse Barnes
parent 9e9f46c44e
commit 8e822df700
1 changed files with 4 additions and 0 deletions
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4
drivers/pci/pcie/aspm.c
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@@ -638,6 +638,10 @@ void pcie_aspm_init_link_state(struct pci_dev *pdev)
if (pdev->pcie_type != PCI_EXP_TYPE_ROOT_PORT && if (pdev->pcie_type != PCI_EXP_TYPE_ROOT_PORT &&
pdev->pcie_type != PCI_EXP_TYPE_DOWNSTREAM) pdev->pcie_type != PCI_EXP_TYPE_DOWNSTREAM)
return; return;
/* VIA has a strange chipset, root port is under a bridge */
if (pdev->pcie_type == PCI_EXP_TYPE_ROOT_PORT &&
pdev->bus->self)
return;
down_read(&pci_bus_sem); down_read(&pci_bus_sem);
if (list_empty(&pdev->subordinate->devices)) if (list_empty(&pdev->subordinate->devices))
goto out; goto out;