diff options
| author | Paul Burton <paul.burton@imgtec.com> | 2016-10-05 19:18:15 +0200 |
|---|---|---|
| committer | Ralf Baechle <ralf@linux-mips.org> | 2016-10-06 18:01:45 +0200 |
| commit | cfa93fb9c2eae805f2c16d72bad04ca49b6e16d2 (patch) | |
| tree | 49fd4fe0ee0eac879ddd62cde0a020f42ef03cd3 /arch | |
| parent | MIPS: Sanitise coherentio semantics (diff) | |
| download | linux-cfa93fb9c2eae805f2c16d72bad04ca49b6e16d2.tar.xz linux-cfa93fb9c2eae805f2c16d72bad04ca49b6e16d2.zip | |
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')
| -rw-r--r-- | arch/mips/mm/dma-default.c | 7 |
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)); |