Jacky Chou 72bc82bd1c net: mdio: aspeed: add dummy read to avoid read-after-write issue ...

[ Upstream commit d1a1a4bade ]

The Aspeed MDIO controller may return incorrect data when a read operation
follows immediately after a write. Due to a controller bug, the subsequent
read can latch stale data, causing the polling logic to terminate earlier
than expected.

To work around this hardware issue, insert a dummy read after each write
operation. This ensures that the next actual read returns the correct
data and prevents premature polling exit.

This workaround has been verified to stabilize MDIO transactions on
affected Aspeed platforms.

Fixes: f160e99462 ("net: phy: Add mdio-aspeed")
Signed-off-by: Jacky Chou <jacky_chou@aspeedtech.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://patch.msgid.link/20251211-aspeed_mdio_add_dummy_read-v3-1-382868869004@aspeedtech.com
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

2026-01-08 10:14:32 +01:00

..

acpi_mdio.c

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fwnode_mdio.c

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Kconfig

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Makefile

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mdio-aspeed.c

net: mdio: aspeed: add dummy read to avoid read-after-write issue

2026-01-08 10:14:32 +01:00

mdio-bcm-iproc.c

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mdio-bcm-unimac.c

net: mdio: mdio-bcm-unimac: Correct rate fallback logic

2025-08-15 12:14:06 +02:00

mdio-bitbang.c

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mdio-cavium.c

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mdio-cavium.h

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mdio-gpio.c

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mdio-hisi-femac.c

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mdio-i2c.c

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mdio-ipq4019.c

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mdio-ipq8064.c

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mdio-moxart.c

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mdio-mscc-miim.c

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mdio-mux-bcm6368.c

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mdio-mux-bcm-iproc.c

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mdio-mux-gpio.c

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mdio-mux-meson-g12a.c

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mdio-mux-meson-gxl.c

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mdio-mux-mmioreg.c

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mdio-mux-multiplexer.c

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mdio-mux.c

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mdio-mvusb.c

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mdio-octeon.c

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mdio-regmap.c

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mdio-sun4i.c

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mdio-thunder.c

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mdio-xgene.c

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of_mdio.c

net: phy: fixed_phy: let fixed_phy_unregister free the phy_device

2025-11-13 15:34:15 -05:00