Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 0ff6631b authored by Anton Vorontsov's avatar Anton Vorontsov Committed by David Woodhouse
Browse files

[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: default avatarAnton Vorontsov <avorontsov@ru.mvista.com>
Acked-by: default avatarScott Wood <scottwood@freescale.com>
Signed-off-by: default avatarDavid Woodhouse <dwmw2@infradead.org>
parent 93919d38

drivers/mtd/nand/fsl_elbc_nand.c

+10 −1
Original line number Diff line number Diff line
@@ -481,7 +481,7 @@ 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;
@@ -496,6 +496,15 @@ 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;

}