mtd: nand: mxs: fix PIO_WORD number

In this driver, the CMDPIOWORDS field doesn't always reflect the real number of pio_words sent in the actual DMA transfer (see iMX6 Reference Manual, Ch. 14.2) This patchset fixes them.

Luca Ellero (2):
mtd: nand: mxs: fix PIO_WORDs in mxs_nand_read_buf()
mtd: nand: mxs: fix PIO_WORDs in mxs_nand_write_buf()

 drivers/mtd/nand/mxs_nand.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

1.7.10.4

There is only one pio_word in this DMA transaction so data field must be 1.

---
 drivers/mtd/nand/mxs_nand.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

index 616c9ca..d17e0d0 100644
@@ -453,7 +453,7 @@ static void mxs_nand_read_buf(struct mtd_info *mtd, uint8_t *buf, int length)
 	d->cmd.data =
 		MXS_DMA_DESC_COMMAND_NO_DMAXFER | MXS_DMA_DESC_IRQ |
 		MXS_DMA_DESC_NAND_WAIT_4_READY | MXS_DMA_DESC_DEC_SEM |
-		MXS_DMA_DESC_WAIT4END | (4 << MXS_DMA_DESC_PIO_WORDS_OFFSET);
+		MXS_DMA_DESC_WAIT4END | (1 << MXS_DMA_DESC_PIO_WORDS_OFFSET);
 
 	d->cmd.address = 0;
 

1.7.10.4

There is only one pio_word in this DMA transaction so data field must be 1.

---
 drivers/mtd/nand/mxs_nand.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

index d17e0d0..428a250 100644
@@ -510,7 +510,7 @@ static void mxs_nand_write_buf(struct mtd_info *mtd, const uint8_t *buf,
 	d->cmd.data =
 		MXS_DMA_DESC_COMMAND_DMA_READ | MXS_DMA_DESC_IRQ |
 		MXS_DMA_DESC_DEC_SEM | MXS_DMA_DESC_WAIT4END |
-		(4 << MXS_DMA_DESC_PIO_WORDS_OFFSET) |
+		(1 << MXS_DMA_DESC_PIO_WORDS_OFFSET) |
 		(length << MXS_DMA_DESC_BYTES_OFFSET);
 
 	d->cmd.address = (dma_addr_t)nand_info->data_buf;

1.7.10.4

Technically, this all makes sense. I see no reason to oppose this series, even if there really was no explicit bug in the first place.

Thank you for fixing this!

Best regards,
Marek Vasut