linux-kernel - Re: [BISECTED, REGRESSION] OMAP3 onenand/DMA broken

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Date:   Fri, 3 Jan 2020 19:23:27 +0200
From:   Aaro Koskinen <aaro.koskinen@....fi>
To:     "H. Nikolaus Schaller" <hns@...delico.com>
Cc:     Peter Ujfalusi <peter.ujfalusi@...com>,
        Tony Lindgren <tony@...mide.com>,
        Linux-OMAP <linux-omap@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Discussions about the Letux Kernel 
        <letux-kernel@...nphoenux.org>
Subject: Re: [BISECTED, REGRESSION] OMAP3 onenand/DMA broken

Hi,

On Fri, Jan 03, 2020 at 09:46:58AM +0100, H. Nikolaus Schaller wrote:
> > Am 03.01.2020 um 09:17 schrieb Aaro Koskinen <aaro.koskinen@....fi>:
> > When booting v5.4 (or v5.5-rc4) on N900, the console gets flooded with:
> > 
> > [    8.335754] omap2-onenand 1000000.onenand: timeout waiting for DMA
> > [    8.365753] omap2-onenand 1000000.onenand: timeout waiting for DMA
> > [    8.395751] omap2-onenand 1000000.onenand: timeout waiting for DMA
> > [    8.425750] omap2-onenand 1000000.onenand: timeout waiting for DMA
> > [    8.455749] omap2-onenand 1000000.onenand: timeout waiting for DMA
> > [    8.485748] omap2-onenand 1000000.onenand: timeout waiting for DMA
> > [    8.515777] omap2-onenand 1000000.onenand: timeout waiting for DMA
> > [    8.545776] omap2-onenand 1000000.onenand: timeout waiting for DMA
> > [    8.575775] omap2-onenand 1000000.onenand: timeout waiting for DMA
> > 
> > making the system unusable.
> 
> I can confirm that this issue exists but so far we failed to bisect
> and make a proper report.
> 
> Sometimes the system boots fine and sometimes it fails.
> 
> It happens on omap3-gta04a5one.dts only, but not with omap3-gta04a4.dts
> (both dm3730 but different NAND).

I tried three different boards (N810, N900 and N950) and it always
fails reliably.

A.