Patchwork [U-Boot] mtd: eLBC NAND: remove elbc_fcm_ctrl->oob_poi

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Submitter Mike Hench
Date July 11, 2011, 3:19 p.m.
Message ID <F87D23B7E1F84E4AB52E4FA4A55F85DC026DA014@tpamail.elutions.com>
Download mbox | patch
Permalink /patch/104240/
State Superseded
Headers show

Comments

Mike Hench - July 11, 2011, 3:19 p.m.
The eLBC NAND driver currently follows up each program/write operation
with a
read-back of the page, in order to [ostensibly] fill in ECC data for the
caller. However, the page address used for this read is always -1, so
the read
will never work correctly.  Remove this useless (and potentially
problematic)
block of code.


Signed-off-by: mhench <mhench@elutions.com>
---
 drivers/mtd/nand/fsl_elbc_nand.c |   32
++------------------------------
 1 files changed, 2 insertions(+), 30 deletions(-)

*/
 };
 
 /* These map to the positions used by the FCM hardware ECC generator */
@@ -436,7 +435,6 @@ static void fsl_elbc_cmdfunc(struct mtd_info *mtd,
unsigned int command,
 
 	/* PAGEPROG reuses all of the setup from SEQIN and adds the
length */
 	case NAND_CMD_PAGEPROG: {
-		int full_page;
 		vdbg("fsl_elbc_cmdfunc: NAND_CMD_PAGEPROG "
 		     "writing %d bytes.\n", ctrl->index);
 
@@ -445,34 +443,13 @@ static void fsl_elbc_cmdfunc(struct mtd_info *mtd,
unsigned int command,
 		 * write so the HW generates the ECC.
 		 */
 		if (ctrl->oob || ctrl->column != 0 ||
-		    ctrl->index != mtd->writesize + mtd->oobsize) {
+		    ctrl->index != mtd->writesize + mtd->oobsize)
 			out_be32(&lbc->fbcr, ctrl->index);
-			full_page = 0;
-		} else {
+		else
 			out_be32(&lbc->fbcr, 0);
-			full_page = 1;
-		}
 
 		fsl_elbc_run_command(mtd);
 
-		/* Read back the page in order to fill in the ECC for
the
-		 * caller.  Is this really needed?
-		 */
-		if (full_page && ctrl->oob_poi) {
-			out_be32(&lbc->fbcr, 3);
-			set_addr(mtd, 6, page_addr, 1);
-
-			ctrl->read_bytes = mtd->writesize + 9;
-
-			fsl_elbc_do_read(chip, 1);
-			fsl_elbc_run_command(mtd);
-
-			memcpy_fromio(ctrl->oob_poi + 6,
-				      &ctrl->addr[ctrl->index], 3);
-			ctrl->index += 3;
-		}
-
-		ctrl->oob_poi = NULL;
 		return;
 	}
 
@@ -680,13 +657,8 @@ static void fsl_elbc_write_page(struct mtd_info
*mtd,
 				struct nand_chip *chip,
 				const uint8_t *buf)
 {
-	struct fsl_elbc_mtd *priv = chip->priv;
-	struct fsl_elbc_ctrl *ctrl = priv->ctrl;
-
 	fsl_elbc_write_buf(mtd, buf, mtd->writesize);
 	fsl_elbc_write_buf(mtd, chip->oob_poi, mtd->oobsize);
-
-	ctrl->oob_poi = chip->oob_poi;
 }
 
 static struct fsl_elbc_ctrl *elbc_ctrl;
Scott Wood - July 11, 2011, 7:58 p.m.
On Mon, 11 Jul 2011 11:19:12 -0400
Mike Hench <mhench@elutions.com> wrote:

> The eLBC NAND driver currently follows up each program/write operation
> with a
> read-back of the page, in order to [ostensibly] fill in ECC data for the
> caller. However, the page address used for this read is always -1, so
> the read
> will never work correctly.  Remove this useless (and potentially
> problematic)
> block of code.
> 
> 
> Signed-off-by: mhench <mhench@elutions.com>
> ---
>  drivers/mtd/nand/fsl_elbc_nand.c |   32
> ++------------------------------
>  1 files changed, 2 insertions(+), 30 deletions(-)

Patch is line wrapped.

-Scott

Patch

diff --git a/drivers/mtd/nand/fsl_elbc_nand.c
b/drivers/mtd/nand/fsl_elbc_nand.c
index acdb431..4d1e527 100644
--- a/drivers/mtd/nand/fsl_elbc_nand.c
+++ b/drivers/mtd/nand/fsl_elbc_nand.c
@@ -85,7 +85,6 @@  struct fsl_elbc_ctrl {
 	unsigned int mdr;        /* UPM/FCM Data Register value
*/
 	unsigned int use_mdr;    /* Non zero if the MDR is to be set
*/
 	unsigned int oob;        /* Non zero if operating on OOB data
*/
-	uint8_t *oob_poi;        /* Place to write ECC after read back