> > From: Zhe Wang <zhe.wang1@xxxxxxxxxx>
> >
> > Some UFS devices require that the VCC should drop below 0.1V after
> > turning off, otherwise device may not resume successfully. And
> > because the power-off rate is different on different SOC platforms.
> > Therefore, we hope that the delay can be modified by vendor to
> > adjust the most appropriate delay value.
> >
> > Signed-off-by: Zhe Wang <zhe.wang1@xxxxxxxxxx>
> > ---
> > V1 -> V2
> > - move turnoff_delay_us to struct ufs_vreg instead
> > - replace usleep_range with ufshcd_delay_us
> >
> > drivers/ufs/core/ufshcd.c | 9 ++++++++-
> > include/ufs/ufs.h | 1 +
> > 2 files changed, 9 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
> > index 7256e6c43ca6..386ff6ed2f20 100644
> > --- a/drivers/ufs/core/ufshcd.c
> > +++ b/drivers/ufs/core/ufshcd.c
> > @@ -89,6 +89,9 @@
> > /* Polling time to wait for fDeviceInit */
> > #define FDEVICEINIT_COMPL_TIMEOUT 1500 /* millisecs */
> >
> > +/* Default value of turn off VCC rail: 5000us */
> > +#define UFS_VCC_TURNOFF_DELAY_US 5000
> > +
> > #define ufshcd_toggle_vreg(_dev, _vreg, _on) \
> > ({ \
> > int _ret; \
> > @@ -7784,6 +7787,10 @@ static int ufs_get_device_desc(struct ufs_hba *hba)
> >
> > ufs_fixup_device_setup(hba);
> >
> > + if (hba->dev_quirks & UFS_DEVICE_QUIRK_DELAY_AFTER_LPM &&
> > + !hba->vreg_info.vcc->turnoff_delay_us)
> > + hba->vreg_info.vcc->turnoff_delay_us =
> > UFS_VCC_TURNOFF_DELAY_US;
> > +
> You answered my question to your v1 - where otherwise you are setting this value:
> "We are still preparing and discussing our own UFS host driver code,
> which will be uploaded once we are done."
>
> Well until then - this isn't very useful.
>
> Thanks,
> Avri
>
> > ufshcd_wb_probe(hba, desc_buf);
> >
> > ufshcd_temp_notif_probe(hba, desc_buf);
> > @@ -8918,7 +8925,7 @@ static void ufshcd_vreg_set_lpm(struct ufs_hba *hba)
> > */
> > if (vcc_off && hba->vreg_info.vcc &&
> > hba->dev_quirks & UFS_DEVICE_QUIRK_DELAY_AFTER_LPM)
> > - usleep_range(5000, 5100);
> > + ufshcd_delay_us(hba->vreg_info.vcc->turnoff_delay_us, 100);
> > }
> >
> > #ifdef CONFIG_PM
> > diff --git a/include/ufs/ufs.h b/include/ufs/ufs.h
> > index 1bba3fead2ce..792335dfd70b 100644
> > --- a/include/ufs/ufs.h
> > +++ b/include/ufs/ufs.h
> > @@ -569,6 +569,7 @@ struct ufs_vreg {
> > bool always_on;
> > bool enabled;
> > int max_uA;
> > + u32 turnoff_delay_us;
> > };
> >
> > struct ufs_vreg_info {
> > --
> > 2.17.1
>
OK, thanks for your review.
Thanks,
Zhe Wang
