>
> Rework from previous work by:
> Sujit Reddy Thumma <sthumma@xxxxxxxxxxxxxx>
>
> Override auto suspend tunables for UFS device LUNs during initialization so
> as to efficiently manage background operations and the power consumption.
>
> Signed-off-by: Stanley Chu <stanley.chu@xxxxxxxxxxxx>
Reviewed-by: Avri Altman <avri.altman@xxxxxxx>
> ---
> drivers/scsi/ufs/ufshcd.c | 8 ++++++++ drivers/scsi/ufs/ufshcd.h | 10
> ++++++++++
> 2 files changed, 18 insertions(+)
>
> diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c index
> 30b752c61b97..d253a018a73b 100644
> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -88,6 +88,9 @@
> /* Interrupt aggregation default timeout, unit: 40us */
> #define INT_AGGR_DEF_TO 0x02
>
> +/* default delay of autosuspend: 2000 ms */ #define
Typo?
> +RPM_AUTOSUSPEND_DELAY_MS 2000
> +
> #define ufshcd_toggle_vreg(_dev, _vreg, _on) \
> ({ \
> int _ret; \
> @@ -4612,9 +4615,14 @@ static int ufshcd_change_queue_depth(struct
> scsi_device *sdev, int depth)
> */
> static int ufshcd_slave_configure(struct scsi_device *sdev) {
> + struct ufs_hba *hba = shost_priv(sdev->host);
> struct request_queue *q = sdev->request_queue;
>
> blk_queue_update_dma_pad(q, PRDT_DATA_BYTE_COUNT_PAD - 1);
> +
> + if (ufshcd_is_rpm_autosuspend_allowed(hba))
> + sdev->rpm_autosuspend_delay =
> RPM_AUTOSUSPEND_DELAY_MS;
> +
> return 0;
> }
>
> diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h index
> a43c7135f33d..99ea416519af 100644
> --- a/drivers/scsi/ufs/ufshcd.h
> +++ b/drivers/scsi/ufs/ufshcd.h
> @@ -714,6 +714,12 @@ struct ufs_hba {
> * the performance of ongoing read/write operations.
> */
> #define UFSHCD_CAP_KEEP_AUTO_BKOPS_ENABLED_EXCEPT_SUSPEND (1
> << 5)
> + /*
> + * This capability allows host controller driver to automatically
> + * enable runtime power management by itself instead of waiting
> + * for userspace to control the power management.
> + */
> +#define UFSHCD_CAP_RPM_AUTOSUSPEND (1 << 6)
>
> struct devfreq *devfreq;
> struct ufs_clk_scaling clk_scaling; @@ -747,6 +753,10 @@ static inline
> bool ufshcd_can_autobkops_during_suspend(struct ufs_hba *hba) {
> return hba->caps & UFSHCD_CAP_AUTO_BKOPS_SUSPEND; }
> +static inline bool ufshcd_is_rpm_autosuspend_allowed(struct ufs_hba
> +*hba) {
> + return hba->caps & UFSHCD_CAP_RPM_AUTOSUSPEND; }
>
> static inline bool ufshcd_is_intr_aggr_allowed(struct ufs_hba *hba) {
> --
> 2.18.0
