Using current driver on the MPC837X CPUs elbc hangs during nand write.
Reading last byte helps though (thanks to Scott Wood for the idea).
Signed-off-by: Anton Vorontsov <[EMAIL PROTECTED]>
---
drivers/mtd/nand/fsl_elbc_nand.c | 12 +++++++++++-
1 files changed, 11 insertions(+), 1 deletions(-)
diff --git a/drivers/mtd/nand/fsl_elbc_nand.c b/drivers/mtd/nand/fsl_elbc_nand.c
index 378b7aa..be4c05d 100644
--- a/drivers/mtd/nand/fsl_elbc_nand.c
+++ b/drivers/mtd/nand/fsl_elbc_nand.c
@@ -480,7 +480,7 @@ 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) {
dev_err(ctrl->dev, "write_buf of %d bytes", len);
ctrl->status = 0;
return;
@@ -495,6 +495,16 @@ static void fsl_elbc_write_buf(struct mtd_info *mtd, const
u8 *buf, int len)
}
memcpy_toio(&ctrl->addr[ctrl->index], buf, len);
+#ifdef CONFIG_PPC_MPC837x
+ /*
+ * This is workaround for the weird elbc hangs on the MPC837X CPUs,
+ * 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);
+#endif
ctrl->index += len;
}
--
1.5.2.2
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