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@xxxxxxxxxxxxx> --- drivers/mtd/devices/m25p80.c | 5 ++++- drivers/mtd/spi-nor/spi-nor.c | 2 +- 2 files changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/mtd/devices/m25p80.c b/drivers/mtd/devices/m25p80.c index 1557d8f..693e25f 100644 --- 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 byte */ + 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 f76f3fc..1a12f81 100644 --- a/drivers/mtd/spi-nor/spi-nor.c +++ b/drivers/mtd/spi-nor/spi-nor.c @@ -77,7 +77,7 @@ 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; } -- 1.7.2.rc3 -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
