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IB/hfi1: Guard against concurrent I2C access across all chains

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The discrete ASIC board design makes the two I2C chains not
independent of each other.  That is, only one chain can safely
be accessed at a time.  For discrete ASIC devices, adjust the
resource locking so that access to one I2C chain will lock both
of the chains.

Reviewed-by: Easwar Hariharan <easwar.hariharan@intel.com>
Signed-off-by: Dean Luick <dean.luick@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Dean Luick
2016-04-12 11:26:21 -07:00
committed by Doug Ledford
parent 623bba2d92
commit 90315ad86a
1 changed files with 8 additions and 1 deletions
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9
drivers/staging/rdma/hfi1/firmware.c
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@@ -1413,8 +1413,15 @@ static int __acquire_chip_resource(struct hfi1_devdata *dd, u32 resource)
if (resource & CR_DYN_MASK) {
/* a dynamic resource is in use if either HFI has set the bit */
all_bits = resource_mask(0, resource) |
if (dd->pcidev->device == PCI_DEVICE_ID_INTEL0 &&
(resource & (CR_I2C1 | CR_I2C2))) {
/* discrete devices must serialize across both chains */
all_bits = resource_mask(0, CR_I2C1 | CR_I2C2) |
resource_mask(1, CR_I2C1 | CR_I2C2);
} else {
all_bits = resource_mask(0, resource) |
resource_mask(1, resource);
}
my_bit = resource_mask(dd->hfi1_id, resource);
} else {
/* non-dynamic resources are not split between HFIs */