diff options
| author | Roger Quadros <rogerq@kernel.org> | 2022-02-02 13:21:36 +0200 |
|---|---|---|
| committer | Praneeth Bajjuri <praneeth@ti.com> | 2022-02-02 16:22:01 -0600 |
| commit | a92af887be23d4935d6b05ccdc7a0b0d6a752485 (patch) | |
| tree | ebcb5d4324540cd69f2f77363967b0768ddffe49 /include | |
| parent | cb5e0eb1512c49a54ec01c72efbd00b44d8e2bde (diff) | |
mtd: rawnand: Add quirk to avoid 8-bit and 16-bit reads
Some platforms (e.g. TI AM64) have a limitation that 8-bit
and 16-bit reads do not behave correctly. We need to force 32-bit
reads on such platforms.
Try to use read_buf() ops as much as possible as platform driver
can take care of the quirk. For other places where we cannot use
read_buf() use the quirk flag to limit to 32-bit read.
There are still 2 places where read_byte/read_word is still in use
- nand_block_bad()
- nand_status_op()
A more proper fix will be to move to exec_op() like interface in
the kernel. But for now that might be an overkill.
Signed-off-by: Roger Quadros <rogerq@kernel.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/mtd/rawnand.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/mtd/rawnand.h b/include/linux/mtd/rawnand.h index 66febc6b72..d110f0109e 100644 --- a/include/linux/mtd/rawnand.h +++ b/include/linux/mtd/rawnand.h @@ -783,6 +783,10 @@ nand_get_sdr_timings(const struct nand_data_interface *conf) return &conf->timings.sdr; } +/* NAND Controller Quirks */ + +#define NAND_QUIRK_FORCE_32BIT_READS BIT(0) + /** * struct nand_chip - NAND Private Flash Chip Data * @mtd: MTD device registered to the MTD framework @@ -884,6 +888,7 @@ nand_get_sdr_timings(const struct nand_data_interface *conf) * devices. * @priv: [OPTIONAL] pointer to private chip data * @write_page: [REPLACEABLE] High-level page write function + * @quirks: Platform specific quirks */ struct nand_chip { @@ -968,6 +973,7 @@ struct nand_chip { struct nand_bbt_descr *badblock_pattern; void *priv; + u32 quirks; }; static inline void nand_set_flash_node(struct nand_chip *chip, |