scsi: ufs: ufs-mediatek: Fix performance scaling

If clk-scaling is enabled, performance scaling can be bound to the decision
of clk-scaling to avoid unnecessary boosting.

In addition, fix missing initialization of pm-qos request.

Link: https://lore.kernel.org/r/[e-mail]
Reviewed-by: Stanley Chu <[e-mail]>
Signed-off-by: Peter Wang <[e-mail]>
Signed-off-by: Stanley Chu <[e-mail]>
Signed-off-by: Martin K. Petersen <[e-mail]>

drivers/ufs/host/ufs-mediatek.c

···
 				       boost ? 0 : PM_QOS_DEFAULT_VALUE);
 }
 
+static void ufs_mtk_scale_perf(struct ufs_hba *hba, bool scale_up)
+{
+	ufs_mtk_boost_crypt(hba, scale_up);
+	ufs_mtk_boost_pm_qos(hba, scale_up);
+}
+
 static void ufs_mtk_pwr_ctrl(struct ufs_hba *hba, bool on)
 {
 	struct ufs_mtk_host *host = ufshcd_get_variant(hba);
···
 	if (on) {
 		phy_power_on(host->mphy);
 		ufs_mtk_setup_ref_clk(hba, on);
-		ufs_mtk_boost_crypt(hba, on);
-		ufs_mtk_boost_pm_qos(hba, on);
+		if (!ufshcd_is_clkscaling_supported(hba))
+			ufs_mtk_scale_perf(hba, on);
 	} else {
-		ufs_mtk_boost_pm_qos(hba, on);
-		ufs_mtk_boost_crypt(hba, on);
+		if (!ufshcd_is_clkscaling_supported(hba))
+			ufs_mtk_scale_perf(hba, on);
 		ufs_mtk_setup_ref_clk(hba, on);
 		phy_power_off(host->mphy);
 	}
···
 	ufs_mtk_setup_clocks(hba, true, POST_CHANGE);
 
 	host->ip_ver = ufshcd_readl(hba, REG_UFS_MTK_IP_VER);
+
+	/* Initialize pm-qos request */
+	cpu_latency_qos_add_request(&host->pm_qos_req, PM_QOS_DEFAULT_VALUE);
+	host->pm_qos_init = true;
 
 	goto out;