nvme: avoid bogus CRTO values

Some devices are reporting controller ready mode support, but return 0
for CRTO. These devices require a much higher time to ready than that,
so they are failing to initialize after the driver starter preferring
that value over CAP.TO.

The spec requires that CAP.TO match the appropritate CRTO value, or be
set to 0xff if CRTO is larger than that. This means that CAP.TO can be
used to validate if CRTO is reliable, and provides an appropriate
fallback for setting the timeout value if not. Use whichever is larger.

Link: https://bugzilla.kernel.org/show_bug.cgi?id=217863
Reported-by: Cláudio Sampaio <[email protected]>
Reported-by: Felix Yan <[email protected]>
Tested-by: Felix Yan <[email protected]>
Based-on-a-patch-by: Felix Yan <[email protected]>
Cc: [email protected]
Signed-off-by: Keith Busch <[email protected]>

0 files changed, 0 insertions, 0 deletions