[U-Boot] [PATCH] sf: stmicro: dont send 4 bytes when reading status register

[Mike Frysinger]

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 at gentoo.org>
CC: Jason McMullan <mcmullan at netapp.com>
CC: TsiChung Liew <Tsi-Chung.Liew at freescale.com>
---
 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;
 	}
 
-- 
1.6.2