phy: marvell: a3700: Save/restore selector reg in SGMII init

In SGMII initialization PIN_PIPE_SEL has to be zero when resetting
the PHY. Since comphy_mux already set the selector register to
correct values, we have to store it's value before setting it to 0
and restore it after SGMII init.

Signed-off-by: Marek Behun <marek.behun@nic.cz>
Reviewed-by: Stefan Roese <sr@denx.de>
Signed-off-by: Stefan Roese <sr@denx.de>

drivers/phy/marvell/comphy_a3700.c

@@ -697,13 +697,15 @@ static void comphy_sgmii_phy_init(u32 lane, u32 speed)
 static int comphy_sgmii_power_up(u32 lane, u32 speed, u32 invert)
 {
 	int ret;
+	u32 saved_selector;
 
 	debug_enter();
 
 	/*
 	 * 1. Configure PHY to SATA/SAS mode by setting pin PIN_PIPE_SEL=0
 	 */
-	reg_set(COMPHY_SEL_ADDR, 0, rf_compy_select(lane));
+	saved_selector = readl(COMPHY_SEL_ADDR);
+	reg_set(COMPHY_SEL_ADDR, 0, 0xFFFFFFFF);
 
 	/*
 	 * 2. Reset PHY by setting PHY input port PIN_RESET=1.
@@ -874,6 +876,11 @@ static int comphy_sgmii_power_up(u32 lane, u32 speed, u32 invert)
 	if (!ret)
 		printf("Failed to init RX of SGMII PHY %d\n", lane);
 
+	/*
+	 * Restore saved selector.
+	 */
+	reg_set(COMPHY_SEL_ADDR, saved_selector, 0xFFFFFFFF);
+
 	debug_exit();
 
 	return ret;

drivers/phy/marvell/comphy_a3700.h

@@ -22,7 +22,6 @@
  * COMPHY SB definitions
  */
 #define COMPHY_SEL_ADDR			MVEBU_REG(0x0183FC)
-#define rf_compy_select(lane)		(0x1 << (((lane) == 1) ? 4 : 0))
 
 #define COMPHY_PHY_CFG1_ADDR(lane)	MVEBU_REG(0x018300 + (1 - lane) * 0x28)
 #define rb_pin_pu_iveref		BIT(1)