Re: [PATCH v7 1/9] serial: max310x: don't clobber the TX break bit in set_termios

[Hugo Villeneuve]

On Tue, 6 Oct 2026 07:06:06 +0300
Tapio Reijonen <tapio.reijonen@xxxxxxxxxxx> wrote:

> Hi Hugo,
> 
> On 10/5/26 18:57, Hugo Villeneuve wrote:
> 
> > You commit message indicate only part of what your patch changed,
> > but not why.
> >
> > In this case, IIUC, your patch prevent ending a preconfigured
> > TX break when calling set_termios()?
> 
> Yes, exactly: a break asserted with TIOCSBRK must stay on the wire
> until TIOCCBRK, but any termios change landing in between rewrote the
> whole LCR register and silently ended the break early. The second
> hunk covers the leftover that fix exposes: nothing clears a break
> still asserted when the port is closed - the unconditional LCR write
> was the accidental recovery - so startup() now clears it, the same
> way 8250 does.
> 
> I can reword the message for a v8 to lead with that user-visible
> failure rather than the register mechanics.

Hi Tapio,
some other patches in your series also have a title that simply state
what is done, but not why, so make sure to check their titles
too.


-- 
Hugo Villeneuve