[PATCH V3] PCI: tegra: Enable Relaxed Ordering only for Tegra20 & Tegra30

[Vidya Sagar <vidyas@nvidia.com>]

Currently Relaxed Ordering bit in the configuration space is enabled for
all PCIe devices as the quirk uses PCI_ANY_ID for both Vendor-ID and
Device-ID, but, as per the Technical Reference Manual of Tegra20 which is
available at https://developer.nvidia.com/embedded/downloads#?search=tegra%202
in Sec 34.1, it is mentioned that Relexed Ordering bit needs to be enabled in
its root ports to avoid deadlock in hardware. The same is applicable for
Tegra30 as well though it is not explicitly mentioned in Tegra30 TRM document,
but the same must not be extended to root ports of other Tegra SoCs or
other hosts as the same issue doesn't exist there.

Signed-off-by: Vidya Sagar <vidyas@nvidia.com>
---
V3:
* Modified commit message to make it more precise and explicit

V2:
* Modified commit message to include reference to Tegra20 TRM document.

 drivers/pci/controller/pci-tegra.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/controller/pci-tegra.c b/drivers/pci/controller/pci-tegra.c
index 9cc03a2549c0..241760aa15bd 100644
--- a/drivers/pci/controller/pci-tegra.c
+++ b/drivers/pci/controller/pci-tegra.c
@@ -787,12 +787,15 @@ DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0bf1, tegra_pcie_fixup_class);
 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0e1c, tegra_pcie_fixup_class);
 DECLARE_PCI_FIXUP_EARLY(PCI_VENDOR_ID_NVIDIA, 0x0e1d, tegra_pcie_fixup_class);
 
-/* Tegra PCIE requires relaxed ordering */
+/* Tegra20 and Tegra30 PCIE requires relaxed ordering */
 static void tegra_pcie_relax_enable(struct pci_dev *dev)
 {
 	pcie_capability_set_word(dev, PCI_EXP_DEVCTL, PCI_EXP_DEVCTL_RELAX_EN);
 }
-DECLARE_PCI_FIXUP_FINAL(PCI_ANY_ID, PCI_ANY_ID, tegra_pcie_relax_enable);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_NVIDIA, 0x0bf0, tegra_pcie_relax_enable);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_NVIDIA, 0x0bf1, tegra_pcie_relax_enable);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_NVIDIA, 0x0e1c, tegra_pcie_relax_enable);
+DECLARE_PCI_FIXUP_FINAL(PCI_VENDOR_ID_NVIDIA, 0x0e1d, tegra_pcie_relax_enable);
 
 static int tegra_pcie_request_resources(struct tegra_pcie *pcie)
 {
-- 
2.17.1