[U-Boot] [PATCH 08/15] sunxi_nand_spl: Add proper cache flusing

[Hans de Goede]

We are using dma, so we should flush the cache before starting the dma,
and invalidate it once the dma is done.

Things are working without this by mostly luck, but lets not rely on that.

Signed-off-by: Hans de Goede <hdegoede at redhat.com>
---
 drivers/mtd/nand/sunxi_nand_spl.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/mtd/nand/sunxi_nand_spl.c b/drivers/mtd/nand/sunxi_nand_spl.c
index 147d476..663c03e 100644
--- a/drivers/mtd/nand/sunxi_nand_spl.c
+++ b/drivers/mtd/nand/sunxi_nand_spl.c
@@ -266,6 +266,10 @@ static void nand_read_page(unsigned int real_addr, dma_addr_t dst,
 		writel(oob_offset, SUNXI_NFC_BASE + NFC_SPARE_AREA);
 	}
 
+	flush_dcache_range(dst,
+			   ALIGN(dst + CONFIG_NAND_SUNXI_SPL_ECC_PAGE_SIZE,
+				 ARCH_DMA_MINALIGN));
+
 	/* SUNXI_DMA */
 	writel(0x0, SUNXI_DMA_BASE + SUNXI_DMA_CFG_REG0); /* clr dma cmd */
 	/* read from REG_IO_DATA */
@@ -311,6 +315,10 @@ static void nand_read_page(unsigned int real_addr, dma_addr_t dst,
 		return;
 	}
 
+	invalidate_dcache_range(dst,
+			ALIGN(dst + CONFIG_NAND_SUNXI_SPL_ECC_PAGE_SIZE,
+			      ARCH_DMA_MINALIGN));
+
 	if (readl(SUNXI_NFC_BASE + NFC_ECC_ST))
 		(*ecc_errors)++;
 }
-- 
2.4.3