From c941b77adc40f344215e367b3d1fc638addff870 Mon Sep 17 00:00:00 2001 From: Andrew Caldwell Date: Fri, 7 May 2010 15:10:07 -0400 Subject: [PATCH] Blackfin: nand: drain the write buffer before returning The current Blackfin nand write function fills up the write buffer but returns before it has had a chance to drain. On faster systems, this isn't a problem as the operation finishes before the ECC registers are read, but on slower systems the ECC may be incomplete when the core tries to read it. So wait for the buffer to drain once we're done writing to it. Signed-off-by: Andrew Caldwell Signed-off-by: Mike Frysinger --- drivers/mtd/nand/bfin_nand.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/drivers/mtd/nand/bfin_nand.c b/drivers/mtd/nand/bfin_nand.c index f134ef100f..6d3d45019c 100644 --- a/drivers/mtd/nand/bfin_nand.c +++ b/drivers/mtd/nand/bfin_nand.c @@ -75,7 +75,7 @@ static void bfin_nfc_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl) int bfin_nfc_devready(struct mtd_info *mtd) { pr_stamp(); - return (bfin_read_NFC_STAT() & NBUSY ? 1 : 0); + return (bfin_read_NFC_STAT() & NBUSY) ? 1 : 0; } /* @@ -132,6 +132,11 @@ static void bfin_nfc_write_buf(struct mtd_info *mtd, const uint8_t *buf, int len bfin_write_NFC_DATA_WR(buf[i]); } + + /* Wait for the buffer to drain before we return */ + while (!(bfin_read_NFC_STAT() & WB_EMPTY)) + if (ctrlc()) + return; } /*