linux-kernel - Re: (EXT) Re: [PATCH v9 RESEND 01/13] spi: imx: add dma_sync_sg_for

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Message-ID: <20200609132617.GF4583@sirena.org.uk>
Date:   Tue, 9 Jun 2020 14:26:18 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Matthias Schiffer <matthias.schiffer@...tq-group.com>
Cc:     Robin Murphy <robin.murphy@....com>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "martin.fuzzey@...wbird.group" <martin.fuzzey@...wbird.group>,
        "catalin.marinas@....com" <catalin.marinas@....com>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "will.deacon@....com" <will.deacon@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-spi@...r.kernel.org" <linux-spi@...r.kernel.org>,
        "vkoul@...nel.org" <vkoul@...nel.org>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        dl-linux-imx <linux-imx@....com>,
        "festevam@...il.com" <festevam@...il.com>,
        "u.kleine-koenig@...gutronix.de" <u.kleine-koenig@...gutronix.de>,
        "dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
        "dan.j.williams@...el.com" <dan.j.williams@...el.com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Robin Gong <yibin.gong@....com>
Subject: Re: (EXT) Re: [PATCH v9 RESEND 01/13] spi: imx: add
 dma_sync_sg_for_device after fallback from dma

On Tue, Jun 09, 2020 at 12:09:09PM +0200, Matthias Schiffer wrote:

> I assume the actual issue is that the SDMA controller is considered
> registered before the firmware load has finished, but I have no idea
> how feasible it would be to change that (some comments in the code
> explain why this currently isn't the case).

Right, this is what's causing trouble (or at least the DMA driver not
doing PIO behind the driver I guess but that's pretty nasty).

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