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Date:   Sun, 17 Feb 2019 01:59:26 -0300
From:   Alexandre Oliva <lxoliva@...la.org>
To:     Aaro Koskinen <aaro.koskinen@....fi>, Tom Li <tomli@...li.me>
Cc:     James Hogan <jhogan@...nel.org>,
        Jiaxun Yang <jiaxun.yang@...goat.com>,
        Huacai Chen <chenhc@...ote.com>,
        Ralf Baechle <ralf@...ux-mips.org>, linux-mips@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC] On the Current Troubles of Mainlining Loongson Platform Drivers

On Feb 11, 2019, Aaro Koskinen <aaro.koskinen@....fi> wrote:

> ATA (libata) CS5536 driver is having issues with spurious IRQs and often
> disables IRQs completely during the boot. You should see a warning
> in dmesg. This was the reason for slowness on my FuLoong mini-PC. A
> workaround is to switch to old IDE driver.

Thanks.  I see a NIEN quirk in ide-iops.c that's enabled for the hard
drive model I've got on my yeeloong, but that's not even compiled in my
freeloong builds.  I don't see any changes in libata between 4.19 and
4.20 that could explain the regression either.

I'm afraid there's no observable change in behavior after installing the
proposed patch at
https://lore.kernel.org/linux-mips/20190106124607.GK27785@darkstar.musicnaut.iki.fi/

The kernel still disables irq14 early on, and then runs slow.


Tom, why do you say bisecting this is impossible?  I realize you wrote
you did so for 24 hours non-stop, but...  I'm curious as to what
obstacles you ran into.  It's such a reproducible problem for me that I
can't see how bisecting it might be difficult.

Or were by any chance you talking about the reboot/shutdown problem
then?

-- 
Alexandre Oliva, freedom fighter   https://FSFLA.org/blogs/lxo
Be the change, be Free!         FSF Latin America board member
GNU Toolchain Engineer                Free Software Evangelist
Hay que enGNUrecerse, pero sin perder la terGNUra jamás-GNUChe

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