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mtd: nand: mxs invalidate dcache before DMA read

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Follow linux dma flow:
Before DMA read, be sure to invalidate the cache over the address
range of DMA buffer to prevent cache coherency problems.
After DMA read, invalidate dcache again.

Signed-off-by: Peng Fan <Peng.Fan@freescale.com>
Acked-by: Marek Vasut <marex@denx.de>
Acked-by: Tim Harvey <tharvey@gateworks.com>
This commit is contained in:
Peng Fan 2015-07-21 16:15:21 +08:00 • committed by Scott Wood
parent 63b29d8082
commit ecfb8768b1
1 changed files with 6 additions and 0 deletions
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6
drivers/mtd/nand/mxs_nand.c
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@ -462,6 +462,9 @@ static void mxs_nand_read_buf(struct mtd_info *mtd, uint8_t *buf, int length)
mxs_dma_desc_append(channel, d);
/* Invalidate caches */
mxs_nand_inval_data_buf(nand_info);
/* Execute the DMA chain. */
ret = mxs_dma_go(channel);
if (ret) {
@ -628,6 +631,9 @@ static int mxs_nand_ecc_read_page(struct mtd_info *mtd, struct nand_chip *nand,
mxs_dma_desc_append(channel, d);
/* Invalidate caches */
mxs_nand_inval_data_buf(nand_info);
/* Execute the DMA chain. */
ret = mxs_dma_go(channel);
if (ret) {