diff options
Diffstat (limited to 'drivers/acpi/arm64/iort.c')
| -rw-r--r-- | drivers/acpi/arm64/iort.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c index 47bace8eafb6..e0d2e6e6e40c 100644 --- a/drivers/acpi/arm64/iort.c +++ b/drivers/acpi/arm64/iort.c @@ -547,6 +547,28 @@ static const struct iommu_ops *iort_iommu_xlate(struct device *dev, } /** + * iort_set_dma_mask - Set-up dma mask for a device. + * + * @dev: device to configure + */ +void iort_set_dma_mask(struct device *dev) +{ + /* + * Set default coherent_dma_mask to 32 bit. Drivers are expected to + * setup the correct supported mask. + */ + if (!dev->coherent_dma_mask) + dev->coherent_dma_mask = DMA_BIT_MASK(32); + + /* + * Set it to coherent_dma_mask by default if the architecture + * code has not set it. + */ + if (!dev->dma_mask) + dev->dma_mask = &dev->coherent_dma_mask; +} + +/** * iort_iommu_configure - Set-up IOMMU configuration for a device. * * @dev: device to configure |