From: Anton Vorontsov avorontsov@ru.mvista.com
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 --- 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; }