linux-kernel - Re: [PATCH] spi: spi-fsl-dspi: fix DMA mapping

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Message-ID: <4beb5200a76f2d817be7276444543de4@walle.cc>
Date:   Tue, 10 Mar 2020 08:40:28 +0100
From:   Michael Walle <michael@...le.cc>
To:     linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-media@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linaro-mm-sig@...ts.linaro.org
Cc:     Sumit Semwal <sumit.semwal@...aro.org>,
        Mark Brown <broonie@...nel.org>,
        Vladimir Oltean <vladimir.oltean@....com>
Subject: Re: [PATCH] spi: spi-fsl-dspi: fix DMA mapping

Am 2020-03-10 08:33, schrieb Michael Walle:
> Use the correct device to request the DMA mapping. Otherwise the IOMMU
> doesn't get the mapping and it will generate a page fault.
> 
> The error messages look like:
> [    3.008452] arm-smmu 5000000.iommu: Unhandled context fault:
> fsr=0x402, iova=0xf9800000, fsynr=0x3f0022, cbfrsynra=0x828, cb=8
> [    3.020123] arm-smmu 5000000.iommu: Unhandled context fault:
> fsr=0x402, iova=0xf9800000, fsynr=0x3f0022, cbfrsynra=0x828, cb=8
> 
> This was tested on a custom board with a LS1028A SoC.

Oh fu.. please disregard this patch. DMA mapping still isn't working.
Somehow I missed that the transfer mode was turned back to its default
XSPI mode.

-michael