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Groups > linux.kernel > #1729243 > unrolled thread

[PATCH] mmc: tegra: Mark 64 bit dma broken on Tegra186

Started byKrishna Reddy <vdumpa@nvidia.com>
First post2017-09-08 22:00 +0200
Last post2017-09-09 00:10 +0200
Articles 2 — 2 participants

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  [PATCH] mmc: tegra: Mark 64 bit dma broken on Tegra186 Krishna Reddy <vdumpa@nvidia.com> - 2017-09-08 22:00 +0200
    Re: [PATCH] mmc: tegra: Mark 64 bit dma broken on Tegra186 Thierry Reding <thierry.reding@gmail.com> - 2017-09-09 00:10 +0200

#1729243 — [PATCH] mmc: tegra: Mark 64 bit dma broken on Tegra186

FromKrishna Reddy <vdumpa@nvidia.com>
Date2017-09-08 22:00 +0200
Subject[PATCH] mmc: tegra: Mark 64 bit dma broken on Tegra186
Message-ID<unxBw-3aB-19@gated-at.bofh.it>
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@nvidia.com>
---
 drivers/mmc/host/sdhci-tegra.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/host/sdhci-tegra.c b/drivers/mmc/host/sdhci-tegra.c
index 0cd6fa80db66..b877c13184c2 100644
--- a/drivers/mmc/host/sdhci-tegra.c
+++ b/drivers/mmc/host/sdhci-tegra.c
@@ -422,7 +422,15 @@ static const struct sdhci_pltfm_data sdhci_tegra186_pdata = {
 		  SDHCI_QUIRK_NO_HISPD_BIT |
 		  SDHCI_QUIRK_BROKEN_ADMA_ZEROLEN_DESC |
 		  SDHCI_QUIRK_CAP_CLOCK_BASE_BROKEN,
-	.quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN,
+	.quirks2 = SDHCI_QUIRK2_PRESET_VALUE_BROKEN |
+		   /* SDHCI controllers on Tegra186 support 40-bit addressing.
+		    * IOVA addresses are 48-bit wide on Tegra186.
+		    * With 64-bit dma mask used for SDHCI, accesses can
+		    * be broken. Disable 64-bit dma, which would fall back
+		    * to 32-bit dma mask. Ideally 40-bit dma mask would work,
+		    * But it is not supported as of now.
+		    */
+		   SDHCI_QUIRK2_BROKEN_64_BIT_DMA,
 	.ops  = &tegra114_sdhci_ops,
 };
 
-- 
2.1.4

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#1729328

FromThierry Reding <thierry.reding@gmail.com>
Date2017-09-09 00:10 +0200
Message-ID<unzDj-4FX-13@gated-at.bofh.it>
In reply to#1729243

[Multipart message — attachments visible in raw view] — view raw

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

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