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

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Date:   Fri, 3 Jan 2020 10:17:26 +0200
From:   Aaro Koskinen <aaro.koskinen@....fi>
To:     Peter Ujfalusi <peter.ujfalusi@...com>,
        Tony Lindgren <tony@...mide.com>
Cc:     linux-omap@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [BISECTED, REGRESSION] OMAP3 onenand/DMA broken

Hi,

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.

Bisected to:

4689d35c765c696bdf0535486a990038b242a26b is the first bad commit
commit 4689d35c765c696bdf0535486a990038b242a26b
Author: Peter Ujfalusi <peter.ujfalusi@...com>
Date:   Tue Jul 16 11:24:59 2019 +0300

    dmaengine: ti: omap-dma: Improved memcpy polling support

The commit does not revert cleanly anymore. Any ideas how to fix this?

A.