mtd: spi-nor: fix the wrong dummy value

For the DDR Quad read, the dummy cycles maybe 3 or 6 which is less then 8.
The dummy cycles is actually 8 for SPI fast/dual/quad read.

This patch makes preparations for the DDR quad read, it fixes the wrong dummy
value for both the spi-nor.c and m25p80.c.

Signed-off-by: Huang Shijie <b32955@freescale.com>
Acked-by: Marek Vasut <marex@denx.de>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c
index ed827cf..5d44825 100644 (file)
--- a/drivers/mtd/devices/m25p80.c
+++ b/drivers/mtd/devices/m25p80.c
@@ -128,9 +128,12 @@ static int m25p80_read(struct spi_nor *nor, loff_t from, size_t len,
        struct spi_device *spi = flash->spi;
        struct spi_transfer t[2];
        struct spi_message m;
-       int dummy = nor->read_dummy;
+       unsigned int dummy = nor->read_dummy;
        int ret;
 
+       /* convert the dummy cycles to the number of bytes */
+       dummy /= 8;
+
        /* Wait till previous write/erase is done. */
        ret = nor->wait_till_ready(nor);
        if (ret)

diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
index a98c134..ea6516d 100644 (file)
--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -98,7 +98,7 @@ static inline int spi_nor_read_dummy_cycles(struct spi_nor *nor)
        case SPI_NOR_FAST:
        case SPI_NOR_DUAL:
        case SPI_NOR_QUAD:
-               return 1;
+               return 8;
        case SPI_NOR_NORMAL:
                return 0;
        }