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| author | Mike Frysinger <vapier@gentoo.org> | 2009-04-02 12:51:28 -0400 |
|---|---|---|
| committer | Mike Frysinger <vapier@gentoo.org> | 2009-04-02 12:51:28 -0400 |
| commit | d9596ffbdc79cea285010b67dd20a4618303f624 (patch) | |
| tree | 7ff278dd3468fb85ba484cc641c6c75ac00b7584 | |
| parent | 1abe365ffcfc29c061e8fd8b45551be5ad1428dd (diff) | |
| download | u-boot-imx-d9596ffbdc79cea285010b67dd20a4618303f624.zip u-boot-imx-d9596ffbdc79cea285010b67dd20a4618303f624.tar.gz u-boot-imx-d9596ffbdc79cea285010b67dd20a4618303f624.tar.bz2 | |
sf: stmicro: dont send 4 bytes when reading status register
I can't find anywhere in the datasheet that says the status register needs
3 dummy bytes sent to it before being able to read back the first real
result. Tests on a Blackfin board show that after writing the opcode, the
status register starts coming back immediately. So only write out the
read status register opcode before polling the result.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
CC: Jason McMullan <mcmullan@netapp.com>
CC: TsiChung Liew <Tsi-Chung.Liew@freescale.com>
| -rw-r--r-- | drivers/mtd/spi/stmicro.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/mtd/spi/stmicro.c b/drivers/mtd/spi/stmicro.c index b43e9f4..9b910c1 100644 --- a/drivers/mtd/spi/stmicro.c +++ b/drivers/mtd/spi/stmicro.c @@ -133,12 +133,12 @@ static int stmicro_wait_ready(struct spi_flash *flash, unsigned long timeout) struct spi_slave *spi = flash->spi; unsigned long timebase; int ret; + u8 cmd = CMD_M25PXX_RDSR; u8 status; - u8 cmd[4] = { CMD_M25PXX_RDSR, 0xff, 0xff, 0xff }; - ret = spi_xfer(spi, 32, &cmd[0], NULL, SPI_XFER_BEGIN); + ret = spi_xfer(spi, 8, &cmd, NULL, SPI_XFER_BEGIN); if (ret) { - debug("SF: Failed to send command %02x: %d\n", cmd[0], ret); + debug("SF: Failed to send command %02x: %d\n", cmd, ret); return ret; } |