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r8169: don't activate ASPM in chip if OS can't control ASPM 

Certain chip version / board combinations have massive problems if
ASPM is active. If BIOS enables ASPM and doesn't let OS control it,
then we may have a problem with the current code. Therefore check the
return code of pci_disable_link_state() and don't enable ASPM in the
network chip if OS can't control ASPM.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Heiner Kallweit 2019-06-18 23:14:50 +02:00 committed by David S. Miller
parent 4cfd218855
commit 62b1b3b3b6
1 changed files with 6 additions and 2 deletions
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8
drivers/net/ethernet/realtek/r8169_main.c
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@ -652,6 +652,7 @@ struct rtl8169_private {
unsigned irq_enabled:1;
unsigned supports_gmii:1;
unsigned aspm_manageable:1;
dma_addr_t counters_phys_addr;
struct rtl8169_counters *counters;
struct rtl8169_tc_offsets tc_offset;
@ -4286,7 +4287,8 @@ static void rtl_pcie_state_l2l3_disable(struct rtl8169_private *tp)
static void rtl_hw_aspm_clkreq_enable(struct rtl8169_private *tp, bool enable)
{
if (enable) {
/* Don't enable ASPM in the chip if OS can't control ASPM */
if (enable && tp->aspm_manageable) {
RTL_W8(tp, Config5, RTL_R8(tp, Config5) | ASPM_en);
RTL_W8(tp, Config2, RTL_R8(tp, Config2) | ClkReqEn);
} else {
@ -6678,7 +6680,9 @@ static int rtl_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
/* Disable ASPM completely as that cause random device stop working
* problems as well as full system hangs for some PCIe devices users.
*/
pci_disable_link_state(pdev, PCIE_LINK_STATE_L0S | PCIE_LINK_STATE_L1);
rc = pci_disable_link_state(pdev, PCIE_LINK_STATE_L0S |
PCIE_LINK_STATE_L1);
tp->aspm_manageable = !rc;
/* enable device (incl. PCI PM wakeup and hotplug setup) */
rc = pcim_enable_device(pdev);