linux-kernel - Re: various dma

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Date:   Wed, 29 Aug 2018 15:38:21 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Christoph Hellwig <hch@....de>
Cc:     iommu@...ts.linux-foundation.org,
        Robin Murphy <robin.murphy@....com>,
        Meelis Roos <mroos@...ux.ee>,
        Linus Walleij <linus.walleij@...aro.org>,
        sparclinux@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: various dma_mask fixups

On Wed, Aug 29, 2018 at 08:23:58AM +0200, Christoph Hellwig wrote:
> Fix warnings and regressions from requiring a dma mask.

With this series applied, I see the following in my sh4 boot tests.

sb 1-1: new full-speed USB device number 2 using sm501-usb
sm501-usb sm501-usb: OHCI Unrecoverable Error, disabled
sm501-usb sm501-usb: HC died; cleaning up

This is a persistent problem. Reverting upstream commit 2f606da7823
("mfd: sm501: Set coherent_dma_mask when creating subdevices") does not
make a difference.

The problem is gone if I do not apply 'driver core: initialize a default
DMA mask for platform device'.

On the plus side, the sparc warnings are gone.

Guenter