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authorAndrew Caldwell <Andrew.Caldwell@analog.com>2010-05-07 15:10:07 -0400
committerScott Wood <scottwood@freescale.com>2010-05-26 17:59:13 -0500
commitc941b77adc40f344215e367b3d1fc638addff870 (patch)
tree915f8d635c114f064a0fe24cd554506f875fe99f /drivers/mtd/nand
parent01f03bda5b22e5aeae5f02fd537da97a41485c73 (diff)
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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 <Andrew.Caldwell@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'drivers/mtd/nand')
-rw-r--r--drivers/mtd/nand/bfin_nand.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/mtd/nand/bfin_nand.c b/drivers/mtd/nand/bfin_nand.c
index f134ef1..6d3d450 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;
}
/*