diff options
| author | Gustavo Pimentel <Gustavo.Pimentel@synopsys.com> | 2019-06-04 18:24:43 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-09-23 10:48:05 +0200 |
| commit | eac3517cd33568e8e15a4b51dcb96cd059bc58e4 (patch) | |
| tree | a0e13e1e46db55cdaf4c11c1331eb01c5835e755 /drivers/pci/pci.c | |
| parent | d132ec2ccd4a47ee129eaf824a593c2da3a59c15 (diff) | |
PCI: Decode PCIe 32 GT/s link speed
[ Upstream commit de76cda215d56256ffcda7ffa538b70f9fb301a7 ]
PCIe r5.0, sec 7.5.3.18, defines a new 32.0 GT/s bit in the Supported Link
Speeds Vector of Link Capabilities 2. Decode this new speed. This does
not affect the speed of the link, which should be negotiated automatically
by the hardware; it only adds decoding when showing the speed to the user.
Previously, reading the speed of a link operating at this speed showed
"Unknown speed" instead of "32.0 GT/s".
Link: https://lore.kernel.org/lkml/92365e3caf0fc559f9ab14bcd053bfc92d4f661c.1559664969.git.gustavo.pimentel@synopsys.com
Signed-off-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
[bhelgaas: changelog]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Stable-dep-of: ce7d88110b9e ("drm/amdgpu: Use RMW accessors for changing LNKCTL")
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/pci/pci.c')
| -rw-r--r-- | drivers/pci/pci.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index c8326c7b468f..2ac400adaee1 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -5575,7 +5575,9 @@ enum pci_bus_speed pcie_get_speed_cap(struct pci_dev *dev) */ pcie_capability_read_dword(dev, PCI_EXP_LNKCAP2, &lnkcap2); if (lnkcap2) { /* PCIe r3.0-compliant */ - if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_16_0GB) + if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_32_0GB) + return PCIE_SPEED_32_0GT; + else if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_16_0GB) return PCIE_SPEED_16_0GT; else if (lnkcap2 & PCI_EXP_LNKCAP2_SLS_8_0GB) return PCIE_SPEED_8_0GT; |