phy: cadence-torrent: Add separate functions for reusable code

Torrent PHY driver currently supports single link DP configuration.
Prepare driver to support multilink DP configurations by adding
separate functions for common initialization sequence.

Signed-off-by: Swapnil Jakhade <sjakhade@cadence.com>
Reviewed-by: Kishon Vijay Abraham I <kishon@ti.com>
Link: https://lore.kernel.org/r/20210728145454.15945-8-sjakhade@cadence.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

drivers/phy/cadence/phy-cadence-torrent.c

@@ -1472,24 +1472,11 @@ static int cdns_torrent_phy_off(struct phy *phy)
 	return reset_control_assert(inst->lnk_rst);
 }
 
-static int cdns_torrent_dp_init(struct phy *phy)
+static void cdns_torrent_dp_common_init(struct cdns_torrent_phy *cdns_phy,
+					struct cdns_torrent_inst *inst)
 {
-	unsigned char lane_bits;
-	int ret;
-	struct cdns_torrent_inst *inst = phy_get_drvdata(phy);
-	struct cdns_torrent_phy *cdns_phy = dev_get_drvdata(phy->dev.parent);
 	struct regmap *regmap = cdns_phy->regmap_dptx_phy_reg;
-
-	switch (cdns_phy->ref_clk_rate) {
-	case CLK_19_2_MHZ:
-	case CLK_25_MHZ:
-	case CLK_100_MHZ:
-		/* Valid Ref Clock Rate */
-		break;
-	default:
-		dev_err(cdns_phy->dev, "Unsupported Ref Clock Rate\n");
-		return -EINVAL;
-	}
+	unsigned char lane_bits;
 
 	cdns_torrent_dp_write(regmap, PHY_AUX_CTRL, 0x0003); /* enable AUX */
 
@@ -1510,8 +1497,10 @@ static int cdns_torrent_dp_init(struct phy *phy)
 	/* release pma_xcvr_pllclk_en_ln_*, only for the master lane */
 	cdns_torrent_dp_write(regmap, PHY_PMA_XCVR_PLLCLK_EN, 0x0001);
 
-	/* PHY PMA registers configuration functions */
-	/* Initialize PHY with max supported link rate, without SSC. */
+	/*
+	 * PHY PMA registers configuration functions
+	 * Initialize PHY with max supported link rate, without SSC.
+	 */
 	if (cdns_phy->ref_clk_rate == CLK_19_2_MHZ)
 		cdns_torrent_dp_pma_cmn_vco_cfg_19_2mhz(cdns_phy,
 							cdns_phy->max_bit_rate,
@@ -1530,6 +1519,13 @@ static int cdns_torrent_dp_init(struct phy *phy)
 
 	/* take out of reset */
 	regmap_field_write(cdns_phy->phy_reset_ctrl, 0x1);
+}
+
+static int cdns_torrent_dp_start(struct cdns_torrent_phy *cdns_phy,
+				 struct cdns_torrent_inst *inst,
+				 struct phy *phy)
+{
+	int ret;
 
 	cdns_torrent_phy_on(phy);
 
@@ -1542,6 +1538,27 @@ static int cdns_torrent_dp_init(struct phy *phy)
 	return ret;
 }
 
+static int cdns_torrent_dp_init(struct phy *phy)
+{
+	struct cdns_torrent_inst *inst = phy_get_drvdata(phy);
+	struct cdns_torrent_phy *cdns_phy = dev_get_drvdata(phy->dev.parent);
+
+	switch (cdns_phy->ref_clk_rate) {
+	case CLK_19_2_MHZ:
+	case CLK_25_MHZ:
+	case CLK_100_MHZ:
+		/* Valid Ref Clock Rate */
+		break;
+	default:
+		dev_err(cdns_phy->dev, "Unsupported Ref Clock Rate\n");
+		return -EINVAL;
+	}
+
+	cdns_torrent_dp_common_init(cdns_phy, inst);
+
+	return cdns_torrent_dp_start(cdns_phy, inst, phy);
+}
+
 static int cdns_torrent_derived_refclk_enable(struct clk_hw *hw)
 {
 	struct cdns_torrent_derived_refclk *derived_refclk = to_cdns_torrent_derived_refclk(hw);