Commit 65a2c1ca authored by Sekhar Nori's avatar Sekhar Nori Committed by Boris Brezillon

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

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: default avatarSekhar Nori <nsekhar@ti.com>
Signed-off-by: default avatarBoris Brezillon <boris.brezillon@free-electrons.com>
parent 2d283ede
...@@ -581,6 +581,17 @@ static struct davinci_nand_pdata ...@@ -581,6 +581,17 @@ static struct davinci_nand_pdata
"ti,davinci-nand-use-bbt")) "ti,davinci-nand-use-bbt"))
pdata->bbt_options = NAND_BBT_USE_FLASH; 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, if (of_device_is_compatible(pdev->dev.of_node,
"ti,keystone-nand")) { "ti,keystone-nand")) {
pdata->options |= NAND_NO_SUBPAGE_WRITE; pdata->options |= NAND_NO_SUBPAGE_WRITE;
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment