net: phy: realtek: Fix setting of PHY LEDs Mode B bit on RTL8211F

The current implementation incorrectly sets the mode bit of the PHY chip.
Bit 15 (RTL8211F_LEDCR_MODE) should not be shifted together with the
configuration nibble of a LED- it should be set independently of the
index of the LED being configured.
As a consequence, the RTL8211F LED control is actually operating in Mode A.
Fix the error by or-ing final register value to write with a const-value of
RTL8211F_LEDCR_MODE, thus setting Mode bit explicitly.

Fixes: 1778480 ("net: phy: realtek: Add support for PHY LEDs on RTL8211F")
Signed-off-by: Sava Jakovljev <[email protected]>
Reviewed-by: Marek Vasut <[email protected]>
Link: https://patch.msgid.link/PAWP192MB21287372F30C4E55B6DF6158C38E2@PAWP192MB2128.EURP192.PROD.OUTLOOK.COM
Signed-off-by: Paolo Abeni <[email protected]>

Author: sava-msli

drivers/net/phy/realtek.c

@@ -555,7 +555,7 @@ static int rtl8211f_led_hw_control_set(struct phy_device *phydev, u8 index,
 				       unsigned long rules)
 {
 	const u16 mask = RTL8211F_LEDCR_MASK << (RTL8211F_LEDCR_SHIFT * index);
-	u16 reg = RTL8211F_LEDCR_MODE;	/* Mode B */
+	u16 reg = 0;
 
 	if (index >= RTL8211F_LED_COUNT)
 		return -EINVAL;
@@ -575,6 +575,7 @@ static int rtl8211f_led_hw_control_set(struct phy_device *phydev, u8 index,
 	}
 
 	reg <<= RTL8211F_LEDCR_SHIFT * index;
+	reg |= RTL8211F_LEDCR_MODE;	 /* Mode B */
 
 	return phy_modify_paged(phydev, 0xd04, RTL8211F_LEDCR, mask, reg);
 }