scsi: ufs: ufs-qcom: Factor out the logic finding the HS Gear

In the preparation of adding support for new gears, move the logic that
finds the gear for each platform to a new function. This helps with code
readability and also allows the logic to be used in other places of the
driver in future.

While at it, make it clear that this driver only supports symmetric gear
setting (hs_tx_gear == hs_rx_gear).
Reviewed-by: Andrew Halaney <ahalaney@redhat.com>
Tested-by: Andrew Halaney <ahalaney@redhat.com> # Qdrive3/sa8540p-ride
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/ufs/host/ufs-qcom.c

@@ -269,6 +269,25 @@ static int ufs_qcom_host_reset(struct ufs_hba *hba)
 	return 0;
 }
 
+static u32 ufs_qcom_get_hs_gear(struct ufs_hba *hba)
+{
+	struct ufs_qcom_host *host = ufshcd_get_variant(hba);
+
+	if (host->hw_ver.major == 0x1) {
+		/*
+		 * HS-G3 operations may not reliably work on legacy QCOM
+		 * UFS host controller hardware even though capability
+		 * exchange during link startup phase may end up
+		 * negotiating maximum supported gear as G3.
+		 * Hence downgrade the maximum supported gear to HS-G2.
+		 */
+		return UFS_HS_G2;
+	}
+
+	/* Default is HS-G3 */
+	return UFS_HS_G3;
+}
+
 static int ufs_qcom_power_up_sequence(struct ufs_hba *hba)
 {
 	struct ufs_qcom_host *host = ufshcd_get_variant(hba);
@@ -683,19 +702,8 @@ static int ufs_qcom_pwr_change_notify(struct ufs_hba *hba,
 		ufshcd_init_pwr_dev_param(&ufs_qcom_cap);
 		ufs_qcom_cap.hs_rate = UFS_QCOM_LIMIT_HS_RATE;
 
-		if (host->hw_ver.major == 0x1) {
-			/*
-			 * HS-G3 operations may not reliably work on legacy QCOM
-			 * UFS host controller hardware even though capability
-			 * exchange during link startup phase may end up
-			 * negotiating maximum supported gear as G3.
-			 * Hence downgrade the maximum supported gear to HS-G2.
-			 */
-			if (ufs_qcom_cap.hs_tx_gear > UFS_HS_G2)
-				ufs_qcom_cap.hs_tx_gear = UFS_HS_G2;
-			if (ufs_qcom_cap.hs_rx_gear > UFS_HS_G2)
-				ufs_qcom_cap.hs_rx_gear = UFS_HS_G2;
-		}
+		/* This driver only supports symmetic gear setting i.e., hs_tx_gear == hs_rx_gear */
+		ufs_qcom_cap.hs_tx_gear = ufs_qcom_cap.hs_rx_gear = ufs_qcom_get_hs_gear(hba);
 
 		ret = ufshcd_get_pwr_dev_param(&ufs_qcom_cap,
 					       dev_max_params,