diff options
| author | Bjorn Helgaas <bhelgaas@google.com> | 2022-03-21 21:34:46 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-04-08 15:23:42 +0300 |
| commit | 40092a8ac089dbdaf13d50074b7d56b65e401868 (patch) | |
| tree | f98bf74436ea9279c058a3f3090b15581815cfd6 /drivers/pci | |
| parent | dd1043342e453913760b088e58a780e968674ace (diff) | |
| download | linux-40092a8ac089dbdaf13d50074b7d56b65e401868.tar.xz | |
PCI: Avoid broken MSI on SB600 USB devices
[ Upstream commit 63cd736f449445edcd7f0bcc7d84453e9beec0aa ]
Some ATI SB600 USB adapters advertise MSI, but if INTx is disabled by
setting PCI_COMMAND_INTX_DISABLE, MSI doesn't work either. The PCI/PCIe
specs do not require software to set PCI_COMMAND_INTX_DISABLE when enabling
MSI, but Linux has done that for many years.
Mick reported that 306c54d0edb6 ("usb: hcd: Try MSI interrupts on PCI
devices") broke these devices. Prior to 306c54d0edb6, they used INTx.
Starting with 306c54d0edb6, they use MSI, and and the fact that Linux sets
PCI_COMMAND_INTX_DISABLE means both INTx and MSI are disabled on these
devices.
Avoid this SB600 defect by disabling MSI so we use INTx as before.
Fixes: 306c54d0edb6 ("usb: hcd: Try MSI interrupts on PCI devices")
Link: https://lore.kernel.org/r/20220321183446.1108325-1-helgaas@kernel.org
Link: https://bugzilla.kernel.org/show_bug.cgi?id=215690
Link: https://lore.kernel.org/all/PxIByDyBRcsbpcmVhGSNDFAoUcMmb78ctXCkw6fbpx25TGlCHvA6SJjjFkNr1FfQZMntYPTNyvEnblxzAZ8a6jP9ddLpKeCN6Chi_2FuexU=@protonmail.com/
Link: https://lore.kernel.org/r/20220314101448.90074-1-andriy.shevchenko@linux.intel.com
BugLink: https://lore.kernel.org/all/20200702143045.23429-1-andriy.shevchenko@linux.intel.com/
Reported-by: Mick Lorain <micklorain@protonmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/quirks.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c index e7cd8b504535..4893b1e82403 100644 --- a/drivers/pci/quirks.c +++ b/drivers/pci/quirks.c @@ -1811,6 +1811,18 @@ static void quirk_alder_ioapic(struct pci_dev *pdev) DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_EESSC, quirk_alder_ioapic); #endif +static void quirk_no_msi(struct pci_dev *dev) +{ + pci_info(dev, "avoiding MSI to work around a hardware defect\n"); + dev->no_msi = 1; +} +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, 0x4386, quirk_no_msi); +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, 0x4387, quirk_no_msi); +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, 0x4388, quirk_no_msi); +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, 0x4389, quirk_no_msi); +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, 0x438a, quirk_no_msi); +DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_ATI, 0x438b, quirk_no_msi); + static void quirk_pcie_mch(struct pci_dev *pdev) { pdev->no_msi = 1; |