| Message ID | 20200305040704.10645-4-stanley.chu@mediatek.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | scsi: ufs: some cleanups and make the delay for host enabling customizable | expand |
Hi Stanley, On 2020-03-05 12:07, Stanley Chu wrote: > Currently a 1 ms delay is applied before polling CONTROLLER_ENABLE > bit. This delay may not be required or can be changed in different > controllers. Make the delay as a changeable value in struct ufs_hba to > allow it customized by vendors. > > Signed-off-by: Stanley Chu <stanley.chu@mediatek.com> Reviewed-by: Can Guo <cang@codeaurora.org> > --- > drivers/scsi/ufs/ufshcd.c | 6 +++++- > drivers/scsi/ufs/ufshcd.h | 1 + > 2 files changed, 6 insertions(+), 1 deletion(-) > > diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c > index ed61ecb98b2d..39cae907abd0 100644 > --- a/drivers/scsi/ufs/ufshcd.c > +++ b/drivers/scsi/ufs/ufshcd.c > @@ -4282,7 +4282,10 @@ int ufshcd_hba_enable(struct ufs_hba *hba) > * instruction might be read back. > * This delay can be changed based on the controller. > */ > - usleep_range(1000, 1100); > + if (hba->hba_enable_delay_us) { > + usleep_range(hba->hba_enable_delay_us, > + hba->hba_enable_delay_us + 100); > + } > > /* wait for the host controller to complete initialization */ > retry = 10; > @@ -8402,6 +8405,7 @@ int ufshcd_init(struct ufs_hba *hba, void > __iomem *mmio_base, unsigned int irq) > > hba->mmio_base = mmio_base; > hba->irq = irq; > + hba->hba_enable_delay_us = 1000; > > err = ufshcd_hba_init(hba); > if (err) > diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h > index 49ade1bfd085..baf1143d4839 100644 > --- a/drivers/scsi/ufs/ufshcd.h > +++ b/drivers/scsi/ufs/ufshcd.h > @@ -662,6 +662,7 @@ struct ufs_hba { > u32 eh_flags; > u32 intr_mask; > u16 ee_ctrl_mask; > + u16 hba_enable_delay_us; > bool is_powered; > > /* Work Queues */
diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index ed61ecb98b2d..39cae907abd0 100644 --- a/drivers/scsi/ufs/ufshcd.c +++ b/drivers/scsi/ufs/ufshcd.c @@ -4282,7 +4282,10 @@ int ufshcd_hba_enable(struct ufs_hba *hba) * instruction might be read back. * This delay can be changed based on the controller. */ - usleep_range(1000, 1100); + if (hba->hba_enable_delay_us) { + usleep_range(hba->hba_enable_delay_us, + hba->hba_enable_delay_us + 100); + } /* wait for the host controller to complete initialization */ retry = 10; @@ -8402,6 +8405,7 @@ int ufshcd_init(struct ufs_hba *hba, void __iomem *mmio_base, unsigned int irq) hba->mmio_base = mmio_base; hba->irq = irq; + hba->hba_enable_delay_us = 1000; err = ufshcd_hba_init(hba); if (err) diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h index 49ade1bfd085..baf1143d4839 100644 --- a/drivers/scsi/ufs/ufshcd.h +++ b/drivers/scsi/ufs/ufshcd.h @@ -662,6 +662,7 @@ struct ufs_hba { u32 eh_flags; u32 intr_mask; u16 ee_ctrl_mask; + u16 hba_enable_delay_us; bool is_powered; /* Work Queues */
Currently a 1 ms delay is applied before polling CONTROLLER_ENABLE bit. This delay may not be required or can be changed in different controllers. Make the delay as a changeable value in struct ufs_hba to allow it customized by vendors. Signed-off-by: Stanley Chu <stanley.chu@mediatek.com> --- drivers/scsi/ufs/ufshcd.c | 6 +++++- drivers/scsi/ufs/ufshcd.h | 1 + 2 files changed, 6 insertions(+), 1 deletion(-)