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cxl: Allow initialization on timebase sync failures

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Failure to synchronize the PSL timebase currently prevents the
initialization of the cxl card, thus rendering the card useless. This
is too extreme for a feature which is rarely used, if at all. No
hardware AFUs or software is currently using PSL timebase.

This patch still tries to synchronize the PSL timebase when the card
is initialized, but ignores the error if it can't. Instead, it reports
a status via /sys.

Signed-off-by: Frederic Barrat <[email protected]>
Acked-by: Ian Munsie <[email protected]>
Signed-off-by: Michael Ellerman <[email protected]>
This commit is contained in:
Frederic Barrat 2016-03-21 14:32:48 -05:00 • committed by Michael Ellerman
commit e009a7e858
5 changed files with 37 additions and 9 deletions
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8
Documentation/ABI/testing/sysfs-class-cxl
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@ -233,3 +233,11 @@ Description: read/write
0 = don't trust, the image may be different (default)
1 = trust that the image will not change.
Users: https://github.com/ibm-capi/libcxl
What: /sys/class/cxl/<card>/psl_timebase_synced
Date: March 2016
Contact: [email protected]
Description: read only
Returns 1 if the psl timebase register is synchronized
with the core timebase register, 0 otherwise.
Users: https://github.com/ibm-capi/libcxl