From e8f65763ef07e0667f57dda7eece657f8fe136a7 Mon Sep 17 00:00:00 2001 From: Masahiro Yamada Date: Mon, 10 Sep 2018 11:17:30 +0900 Subject: [PATCH] mtd: nand: denali: fix unaligned cache operations on ARMv7 SoCs If the OOB size is not multiple of the cache line size, the ARMv7 cache operation still prints "Misaligned operation at range". => 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] ... The cache flushing operations won't happen in this case to cover all of the range to fix this by making sure we have things aligned. Reported-by: Marek Vasut Signed-off-by: Masahiro Yamada [trini: Reword the commit message to be clear this is a direct problem rather than just a warning] --- 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 7302c37003..d1cac063f4 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); } -- 2.30.2