[PATCH v1 01/12] dmaengine: acpi: Set up DMA mask based on CSRT
From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Date: 2019-08-06 09:40:58
Subsystem:
dma generic offload engine subsystem, the rest · Maintainers:
Vinod Koul, Linus Torvalds
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@linux.intel.com> --- 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