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authorPaul Burton <paul.burton@imgtec.com>2016-10-05 20:18:15 +0300
committerRalf Baechle <ralf@linux-mips.org>2016-10-06 19:01:45 +0300
commitcfa93fb9c2eae805f2c16d72bad04ca49b6e16d2 (patch)
tree49fd4fe0ee0eac879ddd62cde0a020f42ef03cd3 /arch/mips/mm
parentf23020230e682a43cc4706cabb041bba469df2d6 (diff)
downloadlinux-cfa93fb9c2eae805f2c16d72bad04ca49b6e16d2.tar.xz
MIPS: dma-default: Don't check hw_coherentio if device is non-coherent
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>
Diffstat (limited to 'arch/mips/mm')
-rw-r--r--arch/mips/mm/dma-default.c7
1 files changed, 3 insertions, 4 deletions
diff --git a/arch/mips/mm/dma-default.c b/arch/mips/mm/dma-default.c
index 8b86c6168239..7ae4c55c935a 100644
--- a/arch/mips/mm/dma-default.c
+++ b/arch/mips/mm/dma-default.c
@@ -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);
if (!plat_device_is_coherent(dev)) {
dma_cache_wback_inv((unsigned long) ret, size);
- if (!hw_coherentio)
- ret = UNCAC_ADDR(ret);
+ ret = UNCAC_ADDR(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);
- if (!plat_device_is_coherent(dev) && !hw_coherentio)
+ if (!plat_device_is_coherent(dev))
addr = CAC_ADDR(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;
int ret = -ENXIO;
- if (!plat_device_is_coherent(dev) && !hw_coherentio)
+ if (!plat_device_is_coherent(dev))
addr = CAC_ADDR(addr);
pfn = page_to_pfn(virt_to_page((void *)addr));