linux-kernel - [REGRESSION] OCTEON MMC driver failure with v4.19

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Date:   Fri, 26 Oct 2018 23:54:23 +0300
From:   Aaro Koskinen <aaro.koskinen@....fi>
To:     Robin Murphy <robin.murphy@....com>,
        Christoph Hellwig <hch@....de>, linux-mips@...ux-mips.org,
        linux-kernel@...r.kernel.org
Subject: [REGRESSION] OCTEON MMC driver failure with v4.19

Hi,

OCTEON (MIPS64) MMC driver probe fails with v4.19, because with

commit 6c2fb2ea76361da9b420a8e23a2a19e7842cbdda
Author: Robin Murphy <robin.murphy@....com>
Date:   Mon Jul 23 23:16:09 2018 +0100

    of/device: Set bus DMA mask as appropriate

we now get a default 32-bit bus DMA mask, and the device itself has
64-bit mask, so it gets rejected.

With the current mainline, the driver is again working (probably
because of b4ebe6063204 ("dma-direct: implement complete bus_dma_mask
handling")). But I think this is just because I happen to have < 4 GB RAM,
and it probably could still fail on bigger systems..?

A.