net: phy: realtek: improve firmware write speed

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Firmware execution routine unconditionally uses phy_modify_mmd() for
all OP_WRITE entries which introduces an unnecessary read transaction
when updating an entire 16-bit register. So we optimize this by
checking bitmask boundaries. Use phy_write_mmd() directly to speed up
firmware loading process.

Benchmark number from tracing MDC/MDIO hardware transactions during
firmware loading process:
 - Unpatched: about 28,000 MDIO transactions
 - Patched: about 9,600 MDIO transactions
This results in an approx 65% reduction in MDIO traffic.

Signed-off-by: Javen Xu <javen_xu@realsil.com.cn>
Reviewed-by: Nicolai Buchwitz <nb@tipi-net.de>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://patch.msgid.link/20260911094527.1928-1-javen_xu@realsil.com.cn
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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Javen Xu 2026-09-11 17:45:27 +08:00 • committed by Jakub Kicinski

parent b785f5c56f

commit 3d989d1f40

1 changed files with 6 additions and 2 deletions

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drivers/net/phy/realtek/realtek_main.c

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