diff options
| author | Masahiro Yamada <yamada.masahiro@socionext.com> | 2017-11-22 02:38:27 +0900 |
|---|---|---|
| committer | Masahiro Yamada <yamada.masahiro@socionext.com> | 2017-11-29 00:28:59 +0900 |
| commit | 436fb2b84dc24853298f1768c596f7ee02d582d7 (patch) | |
| tree | 0d063673734ad1c958df0df91c5d0f03dea17371 /drivers/mtd | |
| parent | c7c553f249f99ae282f1fa5c0e314aae0bce8a26 (diff) | |
mtd: nand: allow drivers to request minimum alignment for passed buffer
In some cases, nand_do_{read,write}_ops is passed with unaligned
ops->datbuf. Drivers using DMA will be unhappy about unaligned
buffer.
The new struct member, buf_align, represents the minimum alignment
the driver require for the buffer. If the buffer passed from the
upper MTD layer does not have enough alignment, nand_do_*_ops will
use bufpoi.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
[Linux commit: 477544c62a84d3bacd9f90ba75ffc16c04d78071]
Diffstat (limited to 'drivers/mtd')
| -rw-r--r-- | drivers/mtd/nand/nand_base.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c index 16d4554fae..f3c515b6df 100644 --- a/drivers/mtd/nand/nand_base.c +++ b/drivers/mtd/nand/nand_base.c @@ -1720,6 +1720,9 @@ static int nand_do_read_ops(struct mtd_info *mtd, loff_t from, if (!aligned) use_bufpoi = 1; + else if (chip->options & NAND_USE_BOUNCE_BUFFER) + use_bufpoi = !IS_ALIGNED((unsigned long)buf, + chip->buf_align); else use_bufpoi = 0; @@ -2575,6 +2578,9 @@ static int nand_do_write_ops(struct mtd_info *mtd, loff_t to, if (part_pagewr) use_bufpoi = 1; + else if (chip->options & NAND_USE_BOUNCE_BUFFER) + use_bufpoi = !IS_ALIGNED((unsigned long)buf, + chip->buf_align); else use_bufpoi = 0; @@ -3119,6 +3125,8 @@ static void nand_set_defaults(struct nand_chip *chip, int busw) init_waitqueue_head(&chip->controller->wq); } + if (!chip->buf_align) + chip->buf_align = 1; } /* Sanitize ONFI strings so we can safely print them */ |