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mtd: nand: davinci: add comment on NAND subpage write status on keystone

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Add a comment clarifying that NAND subpage write on keystone works,
but is not being enabled in the interest of backward compatibility.

Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
This commit is contained in:
Sekhar Nori 2017-03-30 20:09:30 +05:30 committed by Boris Brezillon
parent 2d283ede59
commit 65a2c1caa7
1 changed files with 11 additions and 0 deletions
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11
drivers/mtd/nand/davinci_nand.c
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@ -581,6 +581,17 @@ static struct davinci_nand_pdata
"ti,davinci-nand-use-bbt"))
pdata->bbt_options = NAND_BBT_USE_FLASH;
/*
* Since kernel v4.8, this driver has been fixed to enable
* use of 4-bit hardware ECC with subpages and verified on
* TI's keystone EVMs (K2L, K2HK and K2E).
* However, in the interest of not breaking systems using
* existing UBI partitions, sub-page writes are not being
* (re)enabled. If you want to use subpage writes on Keystone
* platforms (i.e. do not have any existing UBI partitions),
* then use "ti,davinci-nand" as the compatible in your
* device-tree file.
*/
if (of_device_is_compatible(pdev->dev.of_node,
"ti,keystone-nand")) {
pdata->options |= NAND_NO_SUBPAGE_WRITE;