Hi all, This series adds support for receiver lane margining. This is standard USB4 port feature that can be used in manufacturing to check electrical robustness and quality of given USB4 port. This is a separate Kconfig option (CONFIG_USB4_DEBUGFS_MARGINING) that can be enabled by the kernels used in manufacturing floor (normal distro kernels do not need this to be enabled). This exposes a new debugfs directory "margining" under each connected USB4 port that can be used to run the margining test. This supports both hardware and software lane margining although I have only tested the former as the current Intel hardware only supports that. Previous version of the series can be found here: https://lore.kernel.org/linux-usb/20220823105352.56306-1-mika.westerberg@xxxxxxxxxxxxxxx/ Changes from the previous version: * Pass bitmask of CL states into tb_port_clx_supported(). This is a new patch 3/5. * Use bitmask of CL states also in tb_port_is_clx_enabled() and drop tb_port_are_clx_enabled(). Mika Westerberg (5): thunderbolt: Move tb_xdomain_parent() to tb.h thunderbolt: Move port CL state functions into correct place in switch.c thunderbolt: Pass CL state bitmask to tb_port_clx_supported() thunderbolt: Add helper to check if CL states are enabled on port thunderbolt: Add support for receiver lane margining drivers/thunderbolt/Kconfig | 10 + drivers/thunderbolt/debugfs.c | 836 ++++++++++++++++++++++++++++++++++ drivers/thunderbolt/sb_regs.h | 58 +++ drivers/thunderbolt/switch.c | 235 +++++----- drivers/thunderbolt/tb.h | 25 +- drivers/thunderbolt/tb_regs.h | 2 + drivers/thunderbolt/usb4.c | 120 +++++ drivers/thunderbolt/xdomain.c | 9 +- 8 files changed, 1182 insertions(+), 113 deletions(-) -- 2.35.1
