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m68k: Set default dma mask for platform devices 

This avoids a WARNING splat when loading the macsonic or macmace driver.
Please see commit 205e1b7f51 ("dma-mapping: warn when there is no
coherent_dma_mask").

This implementation of arch_setup_pdev_archdata() differs from the
powerpc one, in that this one avoids clobbering a device dma mask
which has already been initialized.

Cc: Christoph Hellwig <hch@lst.de>
Cc: Greg Ungerer <gerg@linux-m68k.org>
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Acked-by: Greg Ungerer <gerg@linux-m68k.org>
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
This commit is contained in:
Finn Thain 2018-05-17 20:07:13 +10:00 committed by Geert Uytterhoeven
parent 3f90f9ef2d
commit b12c8a7064
1 changed files with 10 additions and 0 deletions
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10
arch/m68k/kernel/dma.c
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@ -9,6 +9,7 @@
#include <linux/dma-mapping.h>
#include <linux/device.h>
#include <linux/kernel.h>
#include <linux/platform_device.h>
#include <linux/scatterlist.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
@ -165,3 +166,12 @@ const struct dma_map_ops m68k_dma_ops = {
.sync_sg_for_device = m68k_dma_sync_sg_for_device,
};
EXPORT_SYMBOL(m68k_dma_ops);
void arch_setup_pdev_archdata(struct platform_device *pdev)
{
if (pdev->dev.coherent_dma_mask == DMA_MASK_NONE &&
pdev->dev.dma_mask == NULL) {
pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
}
}