On Thu, 2012-03-01 at 11:02 -0500, Alan Stern wrote:
> On Thu, 1 Mar 2012, Lin Ming wrote:
>
> > ZPODD(Zero Power Optical Disk Drive) is a new feature in
> > SATA 3.1 specification. It provides a way to power off unused ODD.
> >
> > ZPODD support is checked in in sr_probe().
> > can_power_off flag is set during suspend if ZPODD is supported.
> >
> > ATA port's runtime suspend callback will actually power off the ODD
> > and its runtime resume callback will actually power on the ODD.
> >
> > When ODD is powered off(D3Cold state), inserting disk will trigger a
> > wakeup event(GPE). GPE AML handler notifies the associated device. Then
> > ODD is resumed in the notify handler.
>
> I have one stylistic comment on this patch...
>
> > diff --git a/drivers/scsi/sr.h b/drivers/scsi/sr.h
> > index 37c8f6b..39b3d8c 100644
> > --- a/drivers/scsi/sr.h
> > +++ b/drivers/scsi/sr.h
> > @@ -42,6 +42,9 @@ typedef struct scsi_cd {
> > unsigned readcd_cdda:1; /* reading audio data using READ_CD */
> > unsigned media_present:1; /* media is present */
> >
> > + unsigned zpodd:1; /* is ZPODD supported */
> > + unsigned zpodd_event:1;
> > +
>
> You should not expect your readers to understand what "ZPODD" means.
> drivers/scsi/sr.h is used by lots of different people, many of whom
> will have no idea what it refers to, especially since it is part of
> the SATA spec and not the SCSI spec. You should provide a brief
> explanation.
I'll add some explanation.
But I'm thinking maybe it's better to move this flag to ata layer, for
example, adding a flag to libata.h
ATA_DFLAG_ZPODD
sr runtime pm is only enabled when ZPODD(or more general, power off) is
supported.
So the problem is how will sr driver know this flag?
>
> Alan Stern
>
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