On 09/10/2018 04:17 AM, Masahiro Yamada wrote:

If the OOB size is not multiple of the cache line size, the ARMv7 cache operation still warns "Misaligned operation at range".

The real cache coherency problem was fixed by commit e3332e1a1a04 ("Make kmalloc'ed memory really DMA-safe"). Now it is the matter of the warning messages.

The cache ops won't happen if the address isn't aligned, so this is needed on armv7a anyway. It's not just about silencing the messages, this patch is actually required.

=> nand info

Device 0: nand0, sector size 256 KiB Page size 4096 b OOB size 224 b Erase size 262144 b subpagesize 4096 b options 0x00104200 bbt options 0x00060000 => nand dump 0 CACHE: Misaligned operation at range [9fb15280, 9fb16360] CACHE: Misaligned operation at range [9fb15280, 9fb16360] CACHE: Misaligned operation at range [9fb15280, 9fb16360] CACHE: Misaligned operation at range [9fb15280, 9fb16360] ...

Reported-by: Marek Vasut marex@denx.de Signed-off-by: Masahiro Yamada yamada.masahiro@socionext.com

---

drivers/mtd/nand/denali.c | 4 ++++ 1 file changed, 4 insertions(+)

diff --git a/drivers/mtd/nand/denali.c b/drivers/mtd/nand/denali.c index 7302c37..d1cac06 100644 --- a/drivers/mtd/nand/denali.c +++ b/drivers/mtd/nand/denali.c @@ -21,6 +21,8 @@ static dma_addr_t dma_map_single(void *dev, void *ptr, size_t size, { unsigned long addr = (unsigned long)ptr;

• size = ALIGN(size, ARCH_DMA_MINALIGN);
• if (dir == DMA_FROM_DEVICE) invalidate_dcache_range(addr, addr + size); else

@@ -32,6 +34,8 @@ static dma_addr_t dma_map_single(void *dev, void *ptr, size_t size, static void dma_unmap_single(void *dev, dma_addr_t addr, size_t size, enum dma_data_direction dir) {

• size = ALIGN(size, ARCH_DMA_MINALIGN);
• if (dir != DMA_TO_DEVICE) invalidate_dcache_range(addr, addr + size);

}