Re: [PATCH net-next 2/2] net: dsa: mxl862xx: use RST_DATA to skip writing zero words

[Andrew Lunn]

On Sat, Mar 21, 2026 at 05:20:14AM +0000, Daniel Golle wrote:
> Issue the firmware's RST_DATA command before writing data payloads that
> contain many zero words. RST_DATA zeroes both the firmware's internal
> buffer and the MMD data registers in a single command, allowing the
> driver to skip individual MDIO writes for zero-valued words. This
> reduces bus traffic for the common case where API structs have many
> unused or default-zero fields.
> 
> The optimization is applied when at least 5 zero words are found in the
> payload, roughly the break-even point against the cost of the extra
> RST_DATA command round-trip.

Reviewed-by: Andrew Lunn <andrew@xxxxxxx>

    Andrew