drivers: marvell: comphy-a3700: fix USB3 powering on when on lane 2

When USB3 is on lane 2 and indirect register access is used, the polling
at the end of the mvebu_a3700_comphy_usb3_power_on function is
incorrect.

The LOOPBACK_REG0 register should not be used at all. Instead we have to
write the LANE_STATUS1 register address (with offset
USB3PHY_LANE2_REG_BASE_OFFSET) into the indirect address register and
then we should poll indirect data register.

This fixes problems on Turris Mox, which uses lane 2 for USB3.
Signed-off-by: Marek Behún <marek.behun@nic.cz>
Change-Id: I968b0cccee5ddbe10a2b5614e52e52d87682aacd

drivers/marvell/comphy/phy-comphy-3700.c

@@ -721,11 +721,11 @@ static int mvebu_a3700_comphy_usb3_power_on(uint8_t comphy_index,
 	udelay(PLL_SET_DELAY_US);
 
 	if (comphy_index == COMPHY_LANE2) {
-		data = COMPHY_LOOPBACK_REG0 + USB3PHY_LANE2_REG_BASE_OFFSET;
+		data = COMPHY_REG_LANE_STATUS1_ADDR + USB3PHY_LANE2_REG_BASE_OFFSET;
 		mmio_write_32(reg_base + COMPHY_LANE2_INDIR_ADDR_OFFSET,
 			      data);
 
-		addr = COMPHY_LOOPBACK_REG0 + USB3PHY_LANE2_REG_BASE_OFFSET;
+		addr = reg_base + COMPHY_LANE2_INDIR_DATA_OFFSET;
 		ret = polling_with_timeout(addr, TXDCLK_PCLK_EN, TXDCLK_PCLK_EN,
 					   COMPHY_PLL_TIMEOUT, REG_32BIT);
 	} else {