diff options
| author | Adrian Hunter <adrian.hunter@intel.com> | 2018-03-20 16:07:38 +0300 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2018-03-22 04:21:25 +0300 |
| commit | ad448378825f5746c5fa37718724bc8f4e7b6945 (patch) | |
| tree | 0ebb00a59acf4e870228d90900fe8c39b5dfbc30 /drivers/scsi/ufs/ufshci.h | |
| parent | 114c1aa210494a02c26aa33f793e5b641df01989 (diff) | |
| download | linux-ad448378825f5746c5fa37718724bc8f4e7b6945.tar.xz | |
scsi: ufs: Add support for Auto-Hibernate Idle Timer
UFS host controllers may support an autonomous power management feature
called the Auto-Hibernate Idle Timer. The timer is set to the number of
microseconds of idle time before the UFS host controller will autonomously
put the link into Hibernate state. That will save power at the expense of
increased latency. Any access to the host controller interface registers
will automatically put the link out of Hibernate state. So once configured,
the feature is transparent to the driver.
Expose the Auto-Hibernate Idle Timer value via SysFS to allow users to
choose between power efficiency or lower latency. Set a default value of
150 ms.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Stanislav Nijnikov <stanislav.nijnikov@wdc.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/ufs/ufshci.h')
| -rw-r--r-- | drivers/scsi/ufs/ufshci.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/scsi/ufs/ufshci.h b/drivers/scsi/ufs/ufshci.h index 1a1b5d9fe514..bb5d9c7f3353 100644 --- a/drivers/scsi/ufs/ufshci.h +++ b/drivers/scsi/ufs/ufshci.h @@ -86,6 +86,7 @@ enum { enum { MASK_TRANSFER_REQUESTS_SLOTS = 0x0000001F, MASK_TASK_MANAGEMENT_REQUEST_SLOTS = 0x00070000, + MASK_AUTO_HIBERN8_SUPPORT = 0x00800000, MASK_64_ADDRESSING_SUPPORT = 0x01000000, MASK_OUT_OF_ORDER_DATA_DELIVERY_SUPPORT = 0x02000000, MASK_UIC_DME_TEST_MODE_SUPPORT = 0x04000000, @@ -119,6 +120,12 @@ enum { #define MANUFACTURE_ID_MASK UFS_MASK(0xFFFF, 0) #define PRODUCT_ID_MASK UFS_MASK(0xFFFF, 16) +/* AHIT - Auto-Hibernate Idle Timer */ +#define UFSHCI_AHIBERN8_TIMER_MASK GENMASK(9, 0) +#define UFSHCI_AHIBERN8_SCALE_MASK GENMASK(12, 10) +#define UFSHCI_AHIBERN8_SCALE_FACTOR 10 +#define UFSHCI_AHIBERN8_MAX (1023 * 100000) + /* * IS - Interrupt Status - 20h */ |