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

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>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c
index b0367f168af4..777b2c76caf5 100644
--- a/drivers/pci/pcie/aspm.c
+++ b/drivers/pci/pcie/aspm.c
@@ -638,6 +638,10 @@ void pcie_aspm_init_link_state(struct pci_dev *pdev)
         if (pdev->pcie_type != PCI_EXP_TYPE_ROOT_PORT &&
                 pdev->pcie_type != PCI_EXP_TYPE_DOWNSTREAM)
                 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);
         if (list_empty(&pdev->subordinate->devices))
                 goto out;