scsi: ufs: set device as active power mode after resetting device

Currently ufshcd driver assumes that bInitPowerMode parameter is not
changed by any vendors thus device power mode can be set as "Active" during
initialization.

According to UFS JEDEC specification, device power mode shall be "Active"
after HW Reset is triggered if the bInitPowerMode parameter in Device
Descriptor is default value.

By above description, we can set device power mode as "Active" after device
reset is triggered by vendor's callback. With this change, the link startup
performance can be improved in some cases by not setting link_startup_again
as true in ufshcd_link_startup().

Link: https://lore.kernel.org/r/[email protected]
Reviewed-by: Can Guo <[email protected]>
Reviewed-by: Asutosh Das <[email protected]>
Signed-off-by: Stanley Chu <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>

Author: Stanley Chu

drivers/scsi/ufs/ufshcd.c

@@ -172,19 +172,6 @@ enum {
 #define ufshcd_clear_eh_in_progress(h) \
 	((h)->eh_flags &= ~UFSHCD_EH_IN_PROGRESS)
 
-#define ufshcd_set_ufs_dev_active(h) \
-	((h)->curr_dev_pwr_mode = UFS_ACTIVE_PWR_MODE)
-#define ufshcd_set_ufs_dev_sleep(h) \
-	((h)->curr_dev_pwr_mode = UFS_SLEEP_PWR_MODE)
-#define ufshcd_set_ufs_dev_poweroff(h) \
-	((h)->curr_dev_pwr_mode = UFS_POWERDOWN_PWR_MODE)
-#define ufshcd_is_ufs_dev_active(h) \
-	((h)->curr_dev_pwr_mode == UFS_ACTIVE_PWR_MODE)
-#define ufshcd_is_ufs_dev_sleep(h) \
-	((h)->curr_dev_pwr_mode == UFS_SLEEP_PWR_MODE)
-#define ufshcd_is_ufs_dev_poweroff(h) \
-	((h)->curr_dev_pwr_mode == UFS_POWERDOWN_PWR_MODE)
-
 struct ufs_pm_lvl_states ufs_pm_lvl_states[] = {
 	{UFS_ACTIVE_PWR_MODE, UIC_LINK_ACTIVE_STATE},
 	{UFS_ACTIVE_PWR_MODE, UIC_LINK_HIBERN8_STATE},

drivers/scsi/ufs/ufshcd.h

@@ -130,6 +130,19 @@ enum uic_link_state {
 #define ufshcd_set_link_hibern8(hba) ((hba)->uic_link_state = \
 				    UIC_LINK_HIBERN8_STATE)
 
+#define ufshcd_set_ufs_dev_active(h) \
+	((h)->curr_dev_pwr_mode = UFS_ACTIVE_PWR_MODE)
+#define ufshcd_set_ufs_dev_sleep(h) \
+	((h)->curr_dev_pwr_mode = UFS_SLEEP_PWR_MODE)
+#define ufshcd_set_ufs_dev_poweroff(h) \
+	((h)->curr_dev_pwr_mode = UFS_POWERDOWN_PWR_MODE)
+#define ufshcd_is_ufs_dev_active(h) \
+	((h)->curr_dev_pwr_mode == UFS_ACTIVE_PWR_MODE)
+#define ufshcd_is_ufs_dev_sleep(h) \
+	((h)->curr_dev_pwr_mode == UFS_SLEEP_PWR_MODE)
+#define ufshcd_is_ufs_dev_poweroff(h) \
+	((h)->curr_dev_pwr_mode == UFS_POWERDOWN_PWR_MODE)
+
 /*
  * UFS Power management levels.
  * Each level is in increasing order of power savings.
@@ -1084,6 +1097,7 @@ static inline void ufshcd_vops_device_reset(struct ufs_hba *hba)
 {
 	if (hba->vops && hba->vops->device_reset) {
 		hba->vops->device_reset(hba);
+		ufshcd_set_ufs_dev_active(hba);
 		ufshcd_update_reg_hist(&hba->ufs_stats.dev_reset, 0);
 	}
 }