Re: [PATCH v2] serial: sh-sci: Support for HSCIF RX sampling point adjustment

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Dear Renesas Open Source team,

We've recently switched from rcar-3.7.x to rcar-3.9.x [1] kernel and the
latter contains this patch [2] by virtue of rcar-3.9.0 commit [3], which
mirrors v4.18-rc1 commit [4] in mainline.

JFYI, quite far away in the delivery chain, we've received below report:

> With this patch [2-4] there are reports about broken data
> communication with 115200 baud with SXM module. Reverting
> this patch results in successful communication, again.

While this scarce information barely helps anybody, I thought that
sharing it with you might be beneficial in case you collect several
reports linked to this specific commit in future, meaning it potentially
adds a regression.

Also, if you are aware of any userland changes that might be
required/assumed by this patch or in case you have any alternative
ideas how to avoid reverting this patch, your feedback would be very
appreciated.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas-bsp.git/tag/?h=rcar-3.9.3
[2] https://patchwork.kernel.org/patch/10322809/
[3] https://git.kernel.org/pub/scm/linux/kernel/git/horms/renesas-bsp.git/commit/?id=e395fc813539
[4] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=63ba1e00f178

Best regards,
Eugeniu.



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