[PATCH] spi: spi-fsl-dspi: fix DMA mapping

From: Michael Walle
Date: Tue Mar 10 2020 - 03:33:34 EST


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.

Signed-off-by: Michael Walle <michael@xxxxxxxx>
---
drivers/spi/spi-fsl-dspi.c | 17 ++++++++++-------
1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/drivers/spi/spi-fsl-dspi.c b/drivers/spi/spi-fsl-dspi.c
index cf8a141bbaf2..ad63804ef690 100644
--- a/drivers/spi/spi-fsl-dspi.c
+++ b/drivers/spi/spi-fsl-dspi.c
@@ -510,14 +510,16 @@ static int dspi_request_dma(struct fsl_dspi *dspi, phys_addr_t phy_addr)
goto err_tx_channel;
}

- dma->tx_dma_buf = dma_alloc_coherent(dev, dspi->devtype_data->dma_bufsize,
+ dma->tx_dma_buf = dma_alloc_coherent(dma->chan_tx->device->dev,
+ dspi->devtype_data->dma_bufsize,
&dma->tx_dma_phys, GFP_KERNEL);
if (!dma->tx_dma_buf) {
ret = -ENOMEM;
goto err_tx_dma_buf;
}

- dma->rx_dma_buf = dma_alloc_coherent(dev, dspi->devtype_data->dma_bufsize,
+ dma->rx_dma_buf = dma_alloc_coherent(dma->chan_rx->device->dev,
+ dspi->devtype_data->dma_bufsize,
&dma->rx_dma_phys, GFP_KERNEL);
if (!dma->rx_dma_buf) {
ret = -ENOMEM;
@@ -554,10 +556,12 @@ static int dspi_request_dma(struct fsl_dspi *dspi, phys_addr_t phy_addr)
return 0;

err_slave_config:
- dma_free_coherent(dev, dspi->devtype_data->dma_bufsize,
+ dma_free_coherent(dma->chan_rx->device->dev,
+ dspi->devtype_data->dma_bufsize,
dma->rx_dma_buf, dma->rx_dma_phys);
err_rx_dma_buf:
- dma_free_coherent(dev, dspi->devtype_data->dma_bufsize,
+ dma_free_coherent(dma->chan_tx->device->dev,
+ dspi->devtype_data->dma_bufsize,
dma->tx_dma_buf, dma->tx_dma_phys);
err_tx_dma_buf:
dma_release_channel(dma->chan_tx);
@@ -573,20 +577,19 @@ static int dspi_request_dma(struct fsl_dspi *dspi, phys_addr_t phy_addr)
static void dspi_release_dma(struct fsl_dspi *dspi)
{
struct fsl_dspi_dma *dma = dspi->dma;
- struct device *dev = &dspi->pdev->dev;

if (!dma)
return;

if (dma->chan_tx) {
- dma_unmap_single(dev, dma->tx_dma_phys,
+ dma_unmap_single(dma->chan_tx->device->dev, dma->tx_dma_phys,
dspi->devtype_data->dma_bufsize,
DMA_TO_DEVICE);
dma_release_channel(dma->chan_tx);
}

if (dma->chan_rx) {
- dma_unmap_single(dev, dma->rx_dma_phys,
+ dma_unmap_single(dma->chan_rx->device->dev, dma->rx_dma_phys,
dspi->devtype_data->dma_bufsize,
DMA_FROM_DEVICE);
dma_release_channel(dma->chan_rx);
--
2.20.1