linux-kernel - Re: [PATCH] Revert "serial: 8250: Fix clearing FIFOs in RS485 mode again"

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Date:   Sun, 16 Dec 2018 22:35:12 +0000
From:   Paul Burton <paul.burton@...s.com>
To:     Ezequiel Garcia <ezequiel@...guardiasur.com.ar>
CC:     Marek Vasut <marex@...x.de>,
        "linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Paul Burton <pburton@...ecomp.com>,
        Daniel Jedrychowski <avistel@...il.com>,
        "linux-mips@...r.kernel.org" <linux-mips@...r.kernel.org>,
        stable <stable@...r.kernel.org>,
        Ezequiel Garcia <ezequiel@...labora.com>
Subject: Re: [PATCH] Revert "serial: 8250: Fix clearing FIFOs in RS485 mode
 again"

Hi Ezequiel,

On Sun, Dec 16, 2018 at 07:28:22PM -0300, Ezequiel Garcia wrote:
> On Sun, 16 Dec 2018 at 19:24, Paul Burton <paul.burton@...s.com> wrote:
> > This helps, but it only addresses one part of one of the 4 reasons I
> > listed as motivation for my revert. For example serial8250_do_shutdown()
> > also clearly intends to disable the FIFOs.
> >
> 
> OK. So, let's fix that :-)

I already did, or at least tried to, on Thursday [1].

> By all means, it would be really nice to push forward and fix the garbage
> issue on JZ4780, as well as the transmission issue on AM335x.
>
> AM335x is a wildly popular platform, and it's not funny to break it.

Well, clearly not if it was broken in v4.10 & only just fixed..? And
from Marek's commit message the patch in v4.10 doesn't break the whole
system just RS485.

> So, let's please stop discussing which board we'll break and just fix both.

I completely agree that would be ideal and I wrote a patch hoping to do
that on Thursday, but didn't get any response on testing. It's late in
the cycle hence a revert made sense. Simple as that.

Thanks,
    Paul

[1] https://lore.kernel.org/lkml/20181213014805.77u5dzydo23cm6fq@pburton-laptop/