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ramips: mt7620: allow both internal and external PHYs

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When the new variable ephy_base was introduced,
it was not applied to the if block for mdio_mode.

The first line in the mdio_mode if block
sets the EPHY base address to 12 in the SOC by writing a register,
but the corresponding variable in the driver
was still set to the default of 0.

This causes subsequent lines that write registers with the function
_mt7620_mii_write
to write to PHY addresses 0 through 4
while internal PHYs have been moved to addresses 12 through 16.

All of these lines are intended only for PHYs on the SOC internal switch,
however, they are being written to external ethernet switches
if they exist at those PHY addresses 0 through 4.
This causes some ethernet ports to be broken on boards with AR8327 or QCA8337 switch.

Other suggested fixes move those lines to the else block of mdio_mode,
but removing the else block completely also fixes it.

Therefore, move the lines to the mt7620_hw_init function main block,
and have only one instance of the function mtk_switch_w32
for writing the register with the EPHY base address.

In theory, this also allows for boards that have both external switches
and internal PHYs that lead to ethernet ports to be supported.

Fixes: 391df37829 ("ramips: mt7620: add EPHY base mdio address changing possibility")
Signed-off-by: Michael Pratt <mcpratt@pm.me>
(cherry picked from commit de5394a29d)
This commit is contained in:
Michael Pratt 2021-04-20 18:45:15 -04:00 committed by Petr Štetiar
parent 01bbed7444
commit 5d7805c78b
1 changed files with 57 additions and 62 deletions
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11
target/linux/ramips/files/drivers/net/ethernet/ralink/gsw_mt7620.c
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@ -98,12 +98,8 @@ static void mt7620_hw_init(struct mt7620_gsw *gsw, int mdio_mode)
mtk_switch_w32(gsw, mtk_switch_r32(gsw, GSW_REG_MIB_CNT_EN) | (1 << 1), GSW_REG_MIB_CNT_EN);
if (mdio_mode) {
u32 val;
/* turn off ephy and set phy base addr to 12 */
mtk_switch_w32(gsw, mtk_switch_r32(gsw, GSW_REG_GPC1) |
(0x1f << 24) | (0xc << 16),
GSW_REG_GPC1);
if (!gsw->ephy_base)
gsw->ephy_base = 12;
/* set MT7530 central align */
val = mt7530_mdio_r32(gsw, 0x7830);
@ -116,7 +112,7 @@ static void mt7620_hw_init(struct mt7620_gsw *gsw, int mdio_mode)
mt7530_mdio_w32(gsw, 0x7a40, val);
mt7530_mdio_w32(gsw, 0x7a78, 0x855);
} else {
}
if (gsw->ephy_base) {
/* set phy base addr to ephy_base */
@ -174,7 +170,6 @@ static void mt7620_hw_init(struct mt7620_gsw *gsw, int mdio_mode)
val |= BMCR_ANRESTART | BMCR_ANENABLE | BMCR_SPEED100;
_mt7620_mii_write(gsw, gsw->ephy_base + i, MII_BMCR, val);
}
}
/* global page 0 */
_mt7620_mii_write(gsw, gsw->ephy_base + 1, 31, 0x8000);