From: Anton Vorontsov <[EMAIL PROTECTED]>
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 <[EMAIL PROTECTED]>
Signed-off-by: Scott Wood <[EMAIL PROTECTED]>
---
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;
}
--
1.5.3
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