scsi: ufs: core: Remove dev cmd clock scaling busy

If a dev command times out, clk_scaling.active_reqs is not decreased which
causes abnormal clock scaling.

It is complicated to handle different dev command timeout cases in both
legacy mode and MCQ mode. Besides, dev cmds are rarely used and the busy
time is short.

Remove clock scaling busy window for dev cmds like we do for UIC or TM cmds
which don't update busy window either.

Signed-off-by: Peter Wang <peter.wang@mediatek.com>
Link: https://lore.kernel.org/r/20231004062454.29165-1-peter.wang@mediatek.com
Reviewed-by: Stanley Chu <stanley.chu@mediatek.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

Author: ptr324

drivers/ufs/core/ufshcd.c

@@ -2165,7 +2165,8 @@ void ufshcd_send_command(struct ufs_hba *hba, unsigned int task_tag,
 	lrbp->compl_time_stamp = ktime_set(0, 0);
 	lrbp->compl_time_stamp_local_clock = 0;
 	ufshcd_add_command_trace(hba, task_tag, UFS_CMD_SEND);
-	ufshcd_clk_scaling_start_busy(hba);
+	if (lrbp->cmd)
+		ufshcd_clk_scaling_start_busy(hba);
 	if (unlikely(ufshcd_should_inform_monitor(hba, lrbp)))
 		ufshcd_start_monitor(hba, lrbp);
 
@@ -5401,7 +5402,6 @@ void ufshcd_compl_one_cqe(struct ufs_hba *hba, int task_tag,
 				lrbp->utr_descriptor_ptr->header.ocs = ocs;
 			}
 			complete(hba->dev_cmd.complete);
-			ufshcd_clk_scaling_update_busy(hba);
 		}
 	}
 }