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MIPS: dma-default: Don't check hw_coherentio if device is non-coherent

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There are no cases where plat_device_is_coherent() will return zero
whilst hw_coherentio is non-zero, and acting any differently in such a
case doesn't make much sense - if a device is non-coherent with the CPU
caches then access to memory "coherent" with DMA must be uncached. Clean
up the nonsensical case.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/14348/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Paul Burton 2016-10-05 18:18:15 +01:00 committed by Ralf Baechle
parent f23020230e
commit cfa93fb9c2
1 changed files with 3 additions and 4 deletions
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7
arch/mips/mm/dma-default.c
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@ -161,8 +161,7 @@ static void *mips_dma_alloc_coherent(struct device *dev, size_t size,
*dma_handle = plat_map_dma_mem(dev, ret, size); *dma_handle = plat_map_dma_mem(dev, ret, size);
if (!plat_device_is_coherent(dev)) { if (!plat_device_is_coherent(dev)) {
dma_cache_wback_inv((unsigned long) ret, size); dma_cache_wback_inv((unsigned long) ret, size);
if (!hw_coherentio) ret = UNCAC_ADDR(ret);
ret = UNCAC_ADDR(ret);
} }
return ret; return ret;
@ -190,7 +189,7 @@ static void mips_dma_free_coherent(struct device *dev, size_t size, void *vaddr,
plat_unmap_dma_mem(dev, dma_handle, size, DMA_BIDIRECTIONAL); plat_unmap_dma_mem(dev, dma_handle, size, DMA_BIDIRECTIONAL);
if (!plat_device_is_coherent(dev) && !hw_coherentio) if (!plat_device_is_coherent(dev))
addr = CAC_ADDR(addr); addr = CAC_ADDR(addr);
page = virt_to_page((void *) addr); page = virt_to_page((void *) addr);
@ -210,7 +209,7 @@ static int mips_dma_mmap(struct device *dev, struct vm_area_struct *vma,
unsigned long pfn; unsigned long pfn;
int ret = -ENXIO; int ret = -ENXIO;
if (!plat_device_is_coherent(dev) && !hw_coherentio) if (!plat_device_is_coherent(dev))
addr = CAC_ADDR(addr); addr = CAC_ADDR(addr);
pfn = page_to_pfn(virt_to_page((void *)addr)); pfn = page_to_pfn(virt_to_page((void *)addr));