linux-kernel - Re: [PATCH] mmc: tegra: Mark 64 bit dma broken on Tegra186

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Message-ID: <20170908215636.GA4996@aiwendil>
Date:   Fri, 8 Sep 2017 23:59:22 +0200
From:   Thierry Reding <thierry.reding@...il.com>
To:     Krishna Reddy <vdumpa@...dia.com>
Cc:     adrian.hunter@...el.com, ulf.hansson@...aro.org,
        jonathanh@...dia.com, linux-mmc@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mmc: tegra: Mark 64 bit dma broken on Tegra186

On Fri, Sep 08, 2017 at 12:48:33PM -0700, Krishna Reddy wrote:
> SDHCI controllers on Tegra186 support 40 bit addressing.
> IOVA addresses are 48-bit wide on Tegra186.
> SDHCI host common code sets dma mask as either 32-bit or 64-bit.
> To avoid access issues when SMMU is enabled, disable 64-bit dma.
> 
> Signed-off-by: Krishna Reddy <vdumpa@...dia.com>
> ---
>  drivers/mmc/host/sdhci-tegra.c | 10 +++++++++-
>  1 file changed, 9 insertions(+), 1 deletion(-)

This matches a local commit:

Tested-by: Thierry Reding <treding@...dia.com>
Acked-by: Thierry Reding <treding@...dia.com>

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