[PATCH] mtd: nand: Disable subpage writes for drivers without ecc->hwctl

[Helmut Schaa]

Hi Pekon,

On Mon, May 5, 2014 at 10:46 AM, Gupta, Pekon <pekon at ti.com> wrote:
> Any update on below patch? Does this maintain compatibility to
> existing UBIFS images ?

Patch works fine with a VID header offset of 512 and without the crash :)

Feel free to add my

Reported-by: Helmut Schaa <helmut.schaa at googlemail>
Tested-by: Helmut Schaa <helmut.schaa at googlemail>

when sending the patch.

Thanks,
Helmut

> with regards, Pekon
>
>
>
>>>------------------------------------
>>>diff --git a/drivers/mtd/nand/fsl_elbc_nand.c
>>>b/drivers/mtd/nand/fsl_elbc_nand.c
>>>index a21252c..cc79ce4 100644
>>>--- a/drivers/mtd/nand/fsl_elbc_nand.c
>>>+++ b/drivers/mtd/nand/fsl_elbc_nand.c
>>>@@ -723,6 +723,19 @@ static int fsl_elbc_write_page(struct
>>mtd_info
>>>*mtd, struct nand_chip *chip,
>>>        return 0;
>>> }
>>>
>>>+/* ECC will be calculated automatically, and errors will be detected
>>>in
>>>+ * waitfunc.
>>>+ */
>>>+static int fsl_elbc_write_subpage(struct mtd_info *mtd, struct
>>>nand_chip *chip,
>>>+                               uint32_t offset, uint32_t data_len,
>>>+                               const uint8_t *buf, int oob_required)
>>>+{
>>>+       fsl_elbc_write_buf(mtd, buf, mtd->writesize);
>>>+       fsl_elbc_write_buf(mtd, chip->oob_poi, mtd->oobsize);
>>>+
>>>+       return 0;
>>>+}
>>>+
>>> static int fsl_elbc_chip_init(struct fsl_elbc_mtd *priv)
>>> {
>>>        struct fsl_lbc_ctrl *ctrl = priv->ctrl;
>>>@@ -762,6 +775,7 @@ static int fsl_elbc_chip_init(struct
>>fsl_elbc_mtd
>>>*priv)
>>>
>>>        chip->ecc.read_page = fsl_elbc_read_page;
>>>        chip->ecc.write_page = fsl_elbc_write_page;
>>>+       chip->ecc.write_subpage = fsl_elbc_write_subpage;
>>>
>>>        /* If CS Base Register selects full hardware ECC then use it */
>>>        if ((in_be32(&lbc->bank[priv->bank].br) & BR_DECC) ==
>>>
>>>------------------------------------