[v3,0/3] scsi: ufs: Add error handling of Auto-Hibernate

Message

Stanley Chu May 20, 2019, 8:32 a.m. UTC

Currently auto-hibernate is activated if host supports
auto-hibern8 capability. However error-handling is not implemented,
which makes the feature somewhat risky.

If either "Hibernate Enter" or "Hibernate Exit" fail during
auto-hibernate flow, the corresponding interrupt
"UIC_HIBERNATE_ENTER" or "UIC_HIBERNATE_EXIT" shall be raised
according to UFS specification.

This patch adds auto-hibernate error-handling:

- Monitor "Hibernate Enter" and "Hibernate Exit" interrupts after
  auto-hibernate feature is activated.

- If fail happens, trigger error-handling just like "manual-hibernate"
  fail and apply the same recovery flow: schedule UFS error handler in
  ufshcd_check_errors(), and then do host reset and restore
  in UFS error handler.

v3:
 - Fix typo in patch "scsi: ufs: Do not overwrite Auto-Hibernate timer" (Avri Altman)
 - Rebase to Linux 5.2-rc1

v2:
 - Fix sentences in commit message (Marc Gonzalez)
 - Make "Auto-Hibernate" error detection more precise (Bean Huo)

Stanley Chu (3):
  scsi: ufs: Do not overwrite Auto-Hibernate timer
  scsi: ufs: Add error-handling of Auto-Hibernate
  scsi: ufs: Use re-factored Auto-Hibernate function

 drivers/scsi/ufs/ufshcd.c | 33 ++++++++++++++++++++++++++++++++-
 drivers/scsi/ufs/ufshcd.h |  5 +++++
 drivers/scsi/ufs/ufshci.h |  3 +++
 3 files changed, 40 insertions(+), 1 deletion(-)