RE: [RFC PATCH v1] ufs: poll HCS.UCRDY before issuing a UIC command

["Kiwoong Kim" <kwmad.kim@samsung.com>]

> > With auto hibern8 enabled, UIC could be working for a while to process
> > a hibern8 operation and HCI reports UIC not ready for a short term
> > through HCS.UCRDY.
> > And UFS driver can't recognize the operation.
> > 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>
> Is this replaces your previous suggestion -
> https://lore.kernel.org/lkml/1682385635-43601-1-git-send-email-
> kwmad.kim@samsung.com/
> Or is it addressing another issue?
> 
> Thanks,
> Avri
> 

No, they are different. This is about reporting UIC ready and what you mentioned
is about reporting UIC busy in a certain race condition.