diff options
| author | James Erwin <[email protected]> | 2019-11-01 15:20:59 -0400 |
|---|---|---|
| committer | Jason Gunthorpe <[email protected]> | 2019-11-06 13:13:43 -0400 |
| commit | a9c3c4c597704b3a1a2b9bef990e7d8a881f6533 (patch) | |
| tree | 6acc3d0fba799110f4ceba32a87cbac03e691f08 | |
| parent | a99d8080aaf358d5d23581244e5da23b35e340b9 (diff) | |
IB/hfi1: Ensure full Gen3 speed in a Gen4 system
If an hfi1 card is inserted in a Gen4 systems, the driver will avoid the
gen3 speed bump and the card will operate at half speed.
This is because the driver avoids the gen3 speed bump when the parent bus
speed isn't identical to gen3, 8.0GT/s. This is not compatible with gen4
and newer speeds.
Fix by relaxing the test to explicitly look for the lower capability
speeds which inherently allows for gen4 and all future speeds.
Fixes: 7724105686e7 ("IB/hfi1: add driver files")
Link: https://lore.kernel.org/r/[email protected]
Cc: <[email protected]>
Reviewed-by: Dennis Dalessandro <[email protected]>
Reviewed-by: Kaike Wan <[email protected]>
Signed-off-by: James Erwin <[email protected]>
Signed-off-by: Mike Marciniszyn <[email protected]>
Signed-off-by: Dennis Dalessandro <[email protected]>
Signed-off-by: Jason Gunthorpe <[email protected]>
| -rw-r--r-- | drivers/infiniband/hw/hfi1/pcie.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/infiniband/hw/hfi1/pcie.c b/drivers/infiniband/hw/hfi1/pcie.c index 61aa5504d7c3..61362bd6d3ce 100644 --- a/drivers/infiniband/hw/hfi1/pcie.c +++ b/drivers/infiniband/hw/hfi1/pcie.c @@ -319,7 +319,9 @@ int pcie_speeds(struct hfi1_devdata *dd) /* * bus->max_bus_speed is set from the bridge's linkcap Max Link Speed */ - if (parent && dd->pcidev->bus->max_bus_speed != PCIE_SPEED_8_0GT) { + if (parent && + (dd->pcidev->bus->max_bus_speed == PCIE_SPEED_2_5GT || + dd->pcidev->bus->max_bus_speed == PCIE_SPEED_5_0GT)) { dd_dev_info(dd, "Parent PCIe bridge does not support Gen3\n"); dd->link_gen3_capable = 0; } |