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USB4 spec defines standard set of registers to be used for receiver lane margining. This is useful for I/O interface quality and electrical robustness validation during manufacturing. Expose receiver lane margining through new debugfs directory "margining" that is added under each connected USB4 port. Users can then run the margining by writing to the exposed attributes under that directory. Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
60 lines
1.9 KiB
Plaintext
60 lines
1.9 KiB
Plaintext
# SPDX-License-Identifier: GPL-2.0-only
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menuconfig USB4
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tristate "Unified support for USB4 and Thunderbolt"
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depends on PCI
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select APPLE_PROPERTIES if EFI_STUB && X86
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select CRC32
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select CRYPTO
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select CRYPTO_HASH
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select NVMEM
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help
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USB4 and Thunderbolt driver. USB4 is the public specification
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based on the Thunderbolt 3 protocol. This driver is required if
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you want to hotplug Thunderbolt and USB4 compliant devices on
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Apple hardware or on PCs with Intel Falcon Ridge or newer.
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To compile this driver a module, choose M here. The module will be
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called thunderbolt.
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if USB4
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config USB4_DEBUGFS_WRITE
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bool "Enable write by debugfs to configuration spaces (DANGEROUS)"
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help
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Enables writing to device configuration registers through
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debugfs interface.
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Only enable this if you know what you are doing! Never enable
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this for production systems or distro kernels.
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config USB4_DEBUGFS_MARGINING
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bool "Expose receiver lane margining operations under USB4 ports (DANGEROUS)"
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depends on DEBUG_FS
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depends on USB4_DEBUGFS_WRITE
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help
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Enables hardware and software based receiver lane margining support
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under each USB4 port. Used for electrical quality and robustness
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validation during manufacturing. Should not be enabled by distro
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kernels.
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config USB4_KUNIT_TEST
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bool "KUnit tests" if !KUNIT_ALL_TESTS
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depends on (USB4=m || KUNIT=y)
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depends on KUNIT
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default KUNIT_ALL_TESTS
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config USB4_DMA_TEST
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tristate "DMA traffic test driver"
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depends on DEBUG_FS
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help
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This allows sending and receiving DMA traffic through loopback
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connection. Loopback connection can be done by either special
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dongle that has TX/RX lines crossed, or by simply connecting a
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cable back to the host. Only enable this if you know what you
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are doing. Normal users and distro kernels should say N here.
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To compile this driver a module, choose M here. The module will be
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called thunderbolt_dma_test.
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endif # USB4
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