In this series of patches, first, we address several issues in the CL0s
implementation.
Then, we add support for a second low power state of the
link: CL1. Low power states (called collectively CLx) are used to reduce
transmitter and receiver power when a high-speed lane is idle.
We enable it, if both sides of the link support it, and only for the
first hop router (i.e. the first device that connected to the
host router). This is needed for better thermal management.
CL1 improves power management that was intoduced by CL0s.
Also, we add support of dynamic change of TMU mode to Hifi-Uni once DP
tunnel is created. This enables CL0s while DP tunnel exists.
Due to Intel HW limitation, once we changed the TMU mode to Hifi-Uni
(when DP tunnel exists), we don't change TMU mode back to Normal-Uni,
even if DP tunnel is teared-down later.
Gil Fine (5):
thunderbolt: Silently ignore CLx enabling in case CLx is not supported
thunderbolt: CLx disable before system suspend only if previously
enabled
thunderbolt: Change downstream router's TMU rate in both TMU uni/bidir
mode
thunderbolt: Add CL1 support for USB4 and Titan Ridge routers
thunderbolt: Change TMU mode to Hifi-Uni once DP tunneled
drivers/thunderbolt/switch.c | 85 ++++++++-------
drivers/thunderbolt/tb.c | 70 +++++++++++--
drivers/thunderbolt/tb.h | 22 +++-
drivers/thunderbolt/tb_regs.h | 8 ++
drivers/thunderbolt/tmu.c | 192 ++++++++++++++++++++++++++++------
5 files changed, 295 insertions(+), 82 deletions(-)
--
2.17.1
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