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Date:   Fri, 6 Mar 2020 15:19:50 +0100
From:   Christoph Hellwig <hch@lst.de>
To:     Ulf Hansson <ulf.hansson@linaro.org>
Cc:     Christoph Hellwig <hch@lst.de>,
        Linus Walleij <linus.walleij@linaro.org>,
        Greg KH <gregkh@linuxfoundation.org>,
        Arnd Bergmann <arnd@arndb.de>, Haibo Chen <haibo.chen@nxp.com>,
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        "linux-mmc@vger.kernel.org" <linux-mmc@vger.kernel.org>,
        dl-linux-imx <linux-imx@nxp.com>
Subject: Re: [PATCH v4 14/14] mmc: queue: create dev->dma_parms before call
 dma_set_max_seg_size()
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References: <1582100757-20683-1-git-send-email-haibo.chen@nxp.com> <1582100757-20683-9-git-send-email-haibo.chen@nxp.com> <CAPDyKFrR3oawA0o8KJ1ZEP41Ydb+-QWFbtxLua5TLemHybQ6QQ@mail.gmail.com> <20200304162844.GA11727@lst.de> <CACRpkdakLfH_bpU5W44HGZ8XBYGqNsH7B+zuVKs2AXuJLwDtPw@mail.gmail.com> <20200305152337.GC4870@lst.de> <CAPDyKFovCm5r7J4pQNfV21KiyAC+VGHvowddgkdzkSE4f3UnGA@mail.gmail.com>
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On Fri, Mar 06, 2020 at 03:02:09PM +0100, Ulf Hansson wrote:
> That makes sense to me, but we also have other bus types to consider,
> like the amba bus for example.
> 
> So, in principle, those buses that may get DMA capable devices
> attached, needs to do the allocation, that's what you are proposing?

Having a dma_params allocated doesn't mean all devices are dma capable,
for example there are PCI devices that aren't as well.