Commits
Easwar Hariharan committed 145dd2b3995
IB/hfi1: Always turn on CDRs for low power QSFP modules Clock and data recovery mechanisms (CDRs) in active QSFP modules can be turned on or off to improve the bit error rate observed on the channel. Signal integrity and bit error rate requirements require us to always turn on any CDRs present in low power cables (power dissipation 2.5W or lower). However, we adhere to the platform designer's settings (provided in the platform configuration) for higher power cables (dissipation 3.5W or higher) if the platform designer has determined that the platform requires the CDRs to be turned on (or off) and is capable of supplying and cooling the higher power modules. This patch also introduces the get_qsfp_power_class function to centralize the bit twiddling required to determine the QSFP power class across the code. Reusing this function improves the readability of code that depends on knowing the power class of the cable, such as the active and optical channel tuning algorithm. Reviewed-by: Dean Luick <dean.luick@intel.com> Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com> Signed-off-by: Easwar Hariharan <easwar.hariharan@intel.com> Signed-off-by: Doug Ledford <dledford@redhat.com>