Commit a6bc3323 authored by Andy Shevchenko's avatar Andy Shevchenko Committed by Vinod Koul
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dmaengine: acpi: Set up DMA mask based on CSRT 



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: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20190820131546.75744-2-andriy.shevchenko@linux.intel.com


Signed-off-by: default avatarVinod Koul <vkoul@kernel.org>
parent d071fd29

drivers/dma/acpi-dma.c

+7 −0
Original line number Diff line number Diff line
@@ -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;