CSRT has an information about address width, which is supported by the certain DMA controller. Use information from CSRT to set up DMA mask for shared controller. Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx> --- drivers/dma/acpi-dma.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/dma/acpi-dma.c b/drivers/dma/acpi-dma.c index 30243f5c0710..4d66ee059808 100644 --- a/drivers/dma/acpi-dma.c +++ b/drivers/dma/acpi-dma.c @@ -10,6 +10,7 @@ */ #include <linux/device.h> +#include <linux/dma-mapping.h> #include <linux/err.h> #include <linux/module.h> #include <linux/kernel.h> @@ -82,6 +83,12 @@ static int acpi_dma_parse_resource_group(const struct acpi_csrt_group *grp, if (si->base_request_line == 0 && si->num_handshake_signals == 0) return 0; + /* Set up DMA mask based on value from CSRT */ + ret = dma_coerce_mask_and_coherent(&adev->dev, + DMA_BIT_MASK(si->dma_address_width)); + if (ret) + return 0; + adma->base_request_line = si->base_request_line; adma->end_request_line = si->base_request_line + si->num_handshake_signals - 1; -- 2.20.1
