linux-kernel - Re: [PATCH 2/6] ARM: ep93xx: enable SPARSE

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Message-Id: <20191019222413.52f7b79369d085c4ce29bc23@gmail.com>
Date:   Sat, 19 Oct 2019 22:24:13 +0200
From:   Alexander Sverdlin <alexander.sverdlin@...il.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Hubert Feurstein <hubert.feurstein@...tec.at>,
        Hartley Sweeten <hsweeten@...ionengravers.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Lukasz Majewski <lukma@...x.de>
Subject: Re: [PATCH 2/6] ARM: ep93xx: enable SPARSE_IRQ

Hi!

On Sat, 19 Oct 2019 22:08:40 +0200
Arnd Bergmann <arnd@...db.de> wrote:

> > # cat /proc/interrupts
> >            CPU0
> >  39:        146       VIC   7 Edge      eth0
> >  51:     162161       VIC  19 Edge      ep93xx timer
> >  52:        139       VIC  20 Edge      uart-pl010
> >  53:          4       VIC  21 Edge      ep93xx-spi
> >  60:          0       VIC  28 Edge      ep93xx-i2s
> > Err:          0
> 
> I guess that is partial success: some irqs do work ;-)

Yep, VIC1 is working, while VIC0 is not.

> The two interrupts that did not get registered are for the
> dmaengine driver, and that makes sense given the error
> message about the DMA not working. No idea how
> that would be a result of the irq changes though.

Seems, that it has exposed some incompatibilities of
starting IRQ 0 in EP93xx platform fir VIC0 and VIC code
itself, which assumes 0 means "auto assignment" (refer
to vic_init()).

But there are more problems I didn't resolve yet.

-- 
Alexander Sverdlin.