From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Date: Tue, 20 Aug 2019 13:15:37 +0000 (+0300)
Subject: dmaengine: acpi: Set up DMA mask based on CSRT
X-Git-Tag: for-linus-2019-09-27~103^2~21
X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=a6bc332373e5176c2d085657bc643a28950b20b0;p=linux-block.git

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: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20190820131546.75744-2-andriy.shevchenko@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
---

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;