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| author | Anton Vorontsov <avorontsov@ru.mvista.com> | 2008-03-28 22:10:54 +0300 |
|---|---|---|
| committer | Scott Wood <scottwood@freescale.com> | 2008-08-12 11:31:26 -0500 |
| commit | 9c814b0a716aae884bec977b9a032dfa59cfb79a (patch) | |
| tree | 6dff09b10e545767db8d595ccadbcefcd5905ef6 | |
| parent | 9fd020d6b4b36b9fb67cd834bc1ae7fdba15ee9e (diff) | |
| download | u-boot-imx-9c814b0a716aae884bec977b9a032dfa59cfb79a.zip u-boot-imx-9c814b0a716aae884bec977b9a032dfa59cfb79a.tar.gz u-boot-imx-9c814b0a716aae884bec977b9a032dfa59cfb79a.tar.bz2 | |
fsl_elbc_nand: workaround for hangs during nand write
Using current driver elbc sometimes hangs during nand write. Reading back
last byte helps though (thanks to Scott Wood for the idea).
Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com>
Signed-off-by: Scott Wood <scottwood@freescale.com>
| -rw-r--r-- | drivers/mtd/nand/fsl_elbc_nand.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/drivers/mtd/nand/fsl_elbc_nand.c b/drivers/mtd/nand/fsl_elbc_nand.c index c1644c0..ab3e0fd 100644 --- a/drivers/mtd/nand/fsl_elbc_nand.c +++ b/drivers/mtd/nand/fsl_elbc_nand.c @@ -489,7 +489,7 @@ static void fsl_elbc_write_buf(struct mtd_info *mtd, const u8 *buf, int len) struct fsl_elbc_ctrl *ctrl = priv->ctrl; unsigned int bufsize = mtd->writesize + mtd->oobsize; - if (len < 0) { + if (len <= 0) { printf("write_buf of %d bytes", len); ctrl->status = 0; return; @@ -503,6 +503,15 @@ static void fsl_elbc_write_buf(struct mtd_info *mtd, const u8 *buf, int len) } memcpy_toio(&ctrl->addr[ctrl->index], buf, len); + /* + * This is workaround for the weird elbc hangs during nand write, + * Scott Wood says: "...perhaps difference in how long it takes a + * write to make it through the localbus compared to a write to IMMR + * is causing problems, and sync isn't helping for some reason." + * Reading back the last byte helps though. + */ + in_8(&ctrl->addr[ctrl->index] + len - 1); + ctrl->index += len; } |