linux-kernel - Re: [PATCH v2 3/7] iommu/exynos: Set correct dma mask for SysMMU v5+

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Date:   Tue, 12 Jul 2022 18:21:06 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Sam Protsenko <semen.protsenko@...aro.org>,
        Marek Szyprowski <m.szyprowski@...sung.com>
Cc:     Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Janghyuck Kim <janghyuck.kim@...sung.com>,
        Cho KyongHo <pullip.cho@...sung.com>,
        Daniel Mentz <danielmentz@...gle.com>,
        David Virag <virag.david003@...il.com>,
        Sumit Semwal <sumit.semwal@...aro.org>, iommu@...ts.linux.dev,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/7] iommu/exynos: Set correct dma mask for SysMMU v5+

On 11/07/2022 01:05, Sam Protsenko wrote:
> SysMMU v5+ supports 36 bit physical address space. Set corresponding DMA
> mask to avoid falling back to SWTLBIO usage in dma_map_single() because
> of failed dma_capable() check.
> 
> The original code for this fix was suggested by Marek.
> 
> Signed-off-by: Sam Protsenko <semen.protsenko@...aro.org>
> Co-developed-by: Marek Szyprowski <m.szyprowski@...sung.com>
> Signed-off-by: Marek Szyprowski <m.szyprowski@...sung.com>


Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>


Best regards,
Krzysztof