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net: dsa: microchip: use collision based back pressure mode
Errata DS80000758 states that carrier sense back pressure mode can cause
link down issues in 100BASE-TX half duplex mode. The datasheet also
recommends to always use the collision based back pressure mode.
Fixes: b987e98e50
("dsa: add DSA switch driver for Microchip KSZ9477")
Signed-off-by: Enguerrand de Ribaucourt <enguerrand.de-ribaucourt@savoirfairelinux.com>
Reviewed-by: Woojung Huh <Woojung.huh@microchip.com>
Acked-by: Arun Ramadoss <arun.ramadoss@microchip.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
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@ -1297,6 +1297,10 @@ int ksz9477_setup(struct dsa_switch *ds)
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/* Enable REG_SW_MTU__2 reg by setting SW_JUMBO_PACKET */
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ksz_cfg(dev, REG_SW_MAC_CTRL_1, SW_JUMBO_PACKET, true);
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/* Use collision based back pressure mode. */
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ksz_cfg(dev, REG_SW_MAC_CTRL_1, SW_BACK_PRESSURE,
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SW_BACK_PRESSURE_COLLISION);
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/* Now we can configure default MTU value */
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ret = regmap_update_bits(ksz_regmap_16(dev), REG_SW_MTU__2, REG_SW_MTU_MASK,
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VLAN_ETH_FRAME_LEN + ETH_FCS_LEN);
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@ -247,6 +247,7 @@
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#define REG_SW_MAC_CTRL_1 0x0331
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#define SW_BACK_PRESSURE BIT(5)
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#define SW_BACK_PRESSURE_COLLISION 0
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#define FAIR_FLOW_CTRL BIT(4)
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#define NO_EXC_COLLISION_DROP BIT(3)
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#define SW_JUMBO_PACKET BIT(2)
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