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mtd: spi-nor: fix the wrong dummy value

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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>
This commit is contained in:
Huang Shijie 2014-04-28 11:53:38 +08:00 committed by Brian Norris
parent 438320dd34
commit 0b78a2cf2a
2 changed files with 5 additions and 2 deletions
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5
drivers/mtd/devices/m25p80.c
View File

@ -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)

2
drivers/mtd/spi-nor/spi-nor.c
View File

@ -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;
}