AW: [PATCH v6 00/12] i2c: fix, rework and extend RTL9300 I2C driver

[<markus.stockhausen@gmx.de>]

> Von: Jonas Jelonek <jelonek.jonas@gmail.com> 
> Gesendet: Sonntag, 24. August 2025 13:34
> Betreff: [PATCH v6 00/12] i2c: fix, rework and extend RTL9300 I2C driver
>
> This patch series for the RTL9300 I2C driver:
>     - fixes issues, one of them in some cases causing data corruption
>     - reworks significant parts of the current implementation
>     - add support for the (quite similar) RTL9310 series
>
> Goal of this is to fix critical issues, improve overall code quality and
> simplify maintainance and further extension of the driver. Moreover, it
> should be brought on par feature-wise with OpenWrt's downstream driver
> to be able to drop the downstream version.
>
> The first three patches address bugs in the current implementation, on
> of them being critical and causing data corruption under certain
> circumstances. Although the hardware doesn't support SMBus Quick Write,
> the driver claims to support it with a broken implementation. This
> causes to execute a 16-byte Write instead of a Quick Write, e.g. causing
> corruption on not-write-protected SFP EEPROMs and soft-bricking them.
> These three patches are also sent to 'stable' because they fix critical
> issues.
>
> Subsequent patches introduce various smaller and bigger enhancements.
> These include:
>     - use regmap_field + its API instead of macros + GENMASK + shifts
>     - refactor xfer handling
>     - variable renaming to avoid confusion
>     - move some register operations, calling them somewhere else and
>       less frequently
>     - use guarded mutex instead of explicit mutex_lock/_unlock to
>       simplify control flow
>
> Finally, the last two patches add support for RTL9310 (mango) series to
> the driver and adjust the dt-bindings accordingly.
>
> Simple operations have been tested successfully on:
>     - Zyxel XGS1210-12 (RTL9302B)
>     - TP-Link TL-ST1008F v2.0 (RTL9303)
>     - Netgear MS510TXM (RTL9313)
>
> with Byte-Read, Word-Read and I2C-Block-Read. Other operations need
> testing from people with devices available.
>
> Compile-tested with Linux, run-tested as backport in OpenWrt on the
> aforementioned devices.

Repeated the downstream tests with this series backported to 6.12. 
Successfully tested on Linksys LGS328C (RTL9301) and LGS352C (RTL9311)

Tested-by: Markus Stockhausen <markus.stockhausen@gmx.de