Commit d0f1e0c2 authored by Mika Westerberg's avatar Mika Westerberg
Browse files

thunderbolt: Add support for receiver lane margining 



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: default avatarMika Westerberg <mika.westerberg@linux.intel.com>
parent b12d2955

drivers/thunderbolt/Kconfig

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Original line number Diff line number Diff line
@@ -27,6 +27,16 @@ config USB4_DEBUGFS_WRITE 
	  Only enable this if you know what you are doing! Never enable

	  this for production systems or distro kernels.



config USB4_DEBUGFS_MARGINING

	bool "Expose receiver lane margining operations under USB4 ports (DANGEROUS)"

	depends on DEBUG_FS

	depends on USB4_DEBUGFS_WRITE

	help

	  Enables hardware and software based receiver lane margining support

	  under each USB4 port. Used for electrical quality and robustness

	  validation during manufacturing. Should not be enabled by distro

	  kernels.



config USB4_KUNIT_TEST

	bool "KUnit tests" if !KUNIT_ALL_TESTS

	depends on (USB4=m || KUNIT=y)

drivers/thunderbolt/debugfs.c

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drivers/thunderbolt/sb_regs.h

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drivers/thunderbolt/tb.h

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drivers/thunderbolt/usb4.c

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