scsi: ufs: override auto suspend tunables for ufs

Rework from previous work by:
Sujit Reddy Thumma <sthumma@codeaurora.org>

Override auto suspend tunables for UFS device LUNs during initialization so
as to efficiently manage background operations and the power consumption.

Link: https://lore.kernel.org/r/1568649411-5127-3-git-send-email-stanley.chu@mediatek.com
Reviewed-by: Avri Altman <avri.altman@wdc.com>
Reviewed-by: Bean Huo <beanhuo@micron.com>
Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 034dd9c..b580685 100644 (file)
--- 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 RPM_AUTOSUSPEND_DELAY_MS 2000
+
 #define ufshcd_toggle_vreg(_dev, _vreg, _on)                           \
        ({                                                              \
                int _ret;                                               \
@@ -4631,9 +4634,14 @@ 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 = 1;
+
        return 0;
 }
 
@@ -7069,6 +7077,7 @@ static struct scsi_host_template ufshcd_driver_template = {
        .track_queue_depth      = 1,
        .sdev_groups            = ufshcd_driver_groups,
        .dma_boundary           = PAGE_SIZE - 1,
+       .rpm_autosuspend_delay  = RPM_AUTOSUSPEND_DELAY_MS,
 };
 
 static int ufshcd_config_vreg_load(struct device *dev, struct ufs_vreg *vreg,

diff --git a/drivers/scsi/ufs/ufshcd.h b/drivers/scsi/ufs/ufshcd.h
index c94cfda..e0fe247 100644 (file)
--- a/drivers/scsi/ufs/ufshcd.h
+++ b/drivers/scsi/ufs/ufshcd.h
@@ -716,6 +716,12 @@ 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;
@@ -749,6 +755,10 @@ 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)
 {