linux/drivers/ufs
Kiwoong Kim d32533d30e scsi: ufs: core: Poll HCS.UCRDY before issuing a UIC command
With auto hibern8 enabled, UIC could be busy processing a hibern8 operation
and the HCI would reports UIC not ready for a short while through
HCS.UCRDY. The UFS driver doesn't currently handle this situation. The
UFSHCI spec specifies UCRDY like this: whether the host controller is ready
to process UIC COMMAND

The 'ready' could be seen as many different meanings. If the meaning
includes not processing any request from HCI, processing a hibern8
operation can be 'not ready'. In this situation, the driver needs to wait
until the operations is completed.

Signed-off-by: Kiwoong Kim <kwmad.kim@samsung.com>
Link: https://lore.kernel.org/r/550484ffb66300bdcec63d3e304dfd55cb432f1f.1693790060.git.kwmad.kim@samsung.com
Reviewed-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Chanwoo Lee <cw9316.lee@samsung.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
2023-09-05 06:10:24 -04:00
..
core scsi: ufs: core: Poll HCS.UCRDY before issuing a UIC command 2023-09-05 06:10:24 -04:00
host Merge branch '6.5/scsi-fixes' into 6.6/scsi-staging 2023-08-30 20:56:24 -04:00
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