IB/hfi1: Ignore QSFP interrupts until power stabilizes

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Some QSFP cables assert the interrupt line as a side effect of module
plug-in and power up. This causes the SerDes and QSFP tuning algorithm
to begin cable initialization by reading the QSFP memory map over I2C,
which fails. This patch ignores any interrupt line assertion until
the module has completed power up and voltage rails have stabilized,
which can take a maximum of 500 ms per the SFF-8679 specification.

Reviewed-by: Dean Luick <dean.luick@intel.com>
Signed-off-by: Easwar Hariharan <easwar.hariharan@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

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Easwar Hariharan 2016-07-25 13:39:57 -07:00 • committed by Doug Ledford

parent 3ca5f4c068

commit 5fbd98dd20

1 changed files with 21 additions and 7 deletions

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drivers/infiniband/hw/hfi1/chip.c

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