[PATCH 5.12 141/296] net: dsa: bcm_sf2: Fix bcm_sf2_reg_rgmii_cntrl() call for non-RGMII port

Greg Kroah-Hartman
2021-05-31T16:24:40Z

From: Florian Fainelli <f.fainelli@gmail.com>

commit fc516d3a6aa2c6ffe27d0da8818d13839e023e7e upstream.

We cannot call bcm_sf2_reg_rgmii_cntrl() for a port that is not RGMII,
yet we do that in bcm_sf2_sw_mac_link_up() irrespective of the port's
interface. Move that read until we have properly qualified the PHY
interface mode. This avoids triggering a warning on 7278 platforms that
have GMII ports.

Fixes: 55cfeb396965 ("net: dsa: bcm_sf2: add function finding RGMII register")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Acked-by: Rafał Miłecki <rafal@milecki.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/net/dsa/bcm_sf2.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)

--- a/drivers/net/dsa/bcm_sf2.c
+++ b/drivers/net/dsa/bcm_sf2.c
@@ -775,11 +775,9 @@ static void bcm_sf2_sw_mac_link_up(struc
bcm_sf2_sw_mac_link_set(ds, port, interface, true);

if (port != core_readl(priv, CORE_IMP0_PRT_ID)) {
- u32 reg_rgmii_ctrl;
+ u32 reg_rgmii_ctrl = 0;
u32 reg, offset;

- reg_rgmii_ctrl = bcm_sf2_reg_rgmii_cntrl(priv, port);
-
if (priv->type == BCM4908_DEVICE_ID ||
priv->type == BCM7445_DEVICE_ID)
offset = CORE_STS_OVERRIDE_GMIIP_PORT(port);
@@ -790,6 +788,7 @@ static void bcm_sf2_sw_mac_link_up(struc
interface == PHY_INTERFACE_MODE_RGMII_TXID ||
interface == PHY_INTERFACE_MODE_MII ||
interface == PHY_INTERFACE_MODE_REVMII) {
+ reg_rgmii_ctrl = bcm_sf2_reg_rgmii_cntrl(priv, port);
reg = reg_readl(priv, reg_rgmii_ctrl);
reg &= ~(RX_PAUSE_EN | TX_PAUSE_EN);