PCI: Decode PCIe 64 GT/s link speed

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PCIe r6.0, sec 7.5.3.18, defines a new 64.0 GT/s bit in the Supported Link
Speeds Vector of Link Capabilities 2.

This patch 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.

Decode this new speed.  Previously, reading the speed of a link operating
at this speed showed "Unknown speed" instead of "64.0 GT/s".

Link: https://lore.kernel.org/r/aaaab33fe18975e123a84aebce2adb85f44e2bbe.1605739760.git.gustavo.pimentel@synopsys.com
Signed-off-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Krzysztof Wilczyński <kw@linux.com>

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This commit is contained in:

Gustavo Pimentel 2020-11-18 23:49:20 +01:00 • committed by Bjorn Helgaas

parent f8394f232b

commit 341917490d

4 changed files with 11 additions and 3 deletions

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6

drivers/pci/pci.h

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3

drivers/pci/probe.c

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1

include/linux/pci.h

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4

include/uapi/linux/pci_regs.h

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