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[MTD] [NAND] 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> Acked-by: Scott Wood <scottwood@freescale.com> Signed-off-by: David Woodhouse <dwmw2@infradead.org>
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@ -481,7 +481,7 @@ static void fsl_elbc_write_buf(struct mtd_info *mtd, const u8 *buf, int len)
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struct fsl_elbc_ctrl *ctrl = priv->ctrl;
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unsigned int bufsize = mtd->writesize + mtd->oobsize;
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if (len < 0) {
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if (len <= 0) {
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dev_err(ctrl->dev, "write_buf of %d bytes", len);
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ctrl->status = 0;
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return;
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@ -496,6 +496,15 @@ static void fsl_elbc_write_buf(struct mtd_info *mtd, const u8 *buf, int len)
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}
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memcpy_toio(&ctrl->addr[ctrl->index], buf, len);
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/*
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* This is workaround for the weird elbc hangs during nand write,
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* Scott Wood says: "...perhaps difference in how long it takes a
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* write to make it through the localbus compared to a write to IMMR
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* is causing problems, and sync isn't helping for some reason."
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* Reading back the last byte helps though.
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*/
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in_8(&ctrl->addr[ctrl->index] + len - 1);
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ctrl->index += len;
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}
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