redonkable
/
remarkable-linux
1
0
Fork 0
Code Releases Activity

mmc: sdhci-of-esdhc: set proper dma mask for ls104x chips 

[ Upstream commit 5552d7ad59 ]

SDHCI controller in ls1043a and ls1046a generate 40-bit wide addresses
when doing DMA. Make sure that the corresponding dma mask is correctly
configured.

Context: when enabling smmu on these chips the following problem is
encountered: the smmu input address size is 48 bits so the dma mappings
for sdhci end up 48-bit wide. However, on these chips sdhci only use
40-bits of that address size when doing dma.
So you end up with a 48-bit address translation in smmu but the device
generates transactions with clipped 40-bit addresses, thus smmu context
faults are triggered. Setting up the correct dma mask fixes this
situation.

Signed-off-by: Laurentiu Tudor <laurentiu.tudor@nxp.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/10/head
Laurentiu Tudor 2018-07-04 14:34:20 +03:00 committed by Greg Kroah-Hartman
parent 49c90d012a
commit 58d402738d
1 changed files with 6 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/mmc/host/sdhci-of-esdhc.c
View File

@ -22,6 +22,7 @@
#include <linux/sys_soc.h>
#include <linux/clk.h>
#include <linux/ktime.h>
#include <linux/dma-mapping.h>
#include <linux/mmc/host.h>
#include "sdhci-pltfm.h"
#include "sdhci-esdhc.h"
@ -427,6 +428,11 @@ static void esdhc_of_adma_workaround(struct sdhci_host *host, u32 intmask)
static int esdhc_of_enable_dma(struct sdhci_host *host)
{
u32 value;
struct device *dev = mmc_dev(host->mmc);
if (of_device_is_compatible(dev->of_node, "fsl,ls1043a-esdhc") ||
of_device_is_compatible(dev->of_node, "fsl,ls1046a-esdhc"))
dma_set_mask_and_coherent(dev, DMA_BIT_MASK(40));
value = sdhci_readl(host, ESDHC_DMA_SYSCTL);
value |= ESDHC_DMA_SNOOP;