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Date:   Sun, 17 Feb 2019 01:59:26 -0300
From:   Alexandre Oliva <>
To:     Aaro Koskinen <>, Tom Li <>
Cc:     James Hogan <>,
        Jiaxun Yang <>,
        Huacai Chen <>,
        Ralf Baechle <>,,
Subject: Re: [RFC] On the Current Troubles of Mainlining Loongson Platform Drivers

On Feb 11, 2019, Aaro Koskinen <> 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

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

Alexandre Oliva, freedom fighter
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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