diff options
| author | Brian Norris <computersforpeace@gmail.com> | 2013-12-03 15:51:09 -0800 |
|---|---|---|
| committer | Brian Norris <computersforpeace@gmail.com> | 2014-01-13 23:13:05 -0800 |
| commit | 8429bb3975ef81c114cde4da111e64d224d19f83 (patch) | |
| tree | fffbb2465b0ac01d053ba2ba0087a0b0d9db1c8f /include/linux/mtd | |
| parent | ba84fb5952af114e28ac82adcdef75297701ccc1 (diff) | |
mtd: nand: support Micron READ RETRY
Micron provides READ RETRY support via the ONFI vendor-specific
parameter block (to indicate how many read-retry modes are available)
and the ONFI {GET,SET}_FEATURES commands with a vendor-specific feature
address (to support reading/switching the current read-retry mode).
The recommended sequence is as follows:
1. Perform PAGE_READ operation
2. If no ECC error, we are done
3. Run SET_FEATURES with feature address 89h, mode 1
4. Retry PAGE_READ operation
5. If ECC error and there are remaining supported modes, increment the
mode and return to step 3. Otherwise, this is a true ECC error.
6. Run SET_FEATURES with feature address 89h, mode 0, to return to the
default state.
This patch implements the chip->setup_read_retry() callback for
Micron and fills in the chip->read_retries.
Tested on Micron MT29F32G08CBADA, which supports 8 read-retry modes.
The Micron vendor-specific table was checked against the datasheets for
the following Micron NAND:
Needs retry Cell-type Part number Vendor revision Byte 180
----------- --------- ---------------- --------------- ------------
No SLC MT29F16G08ABABA 1 Reserved (0)
No MLC MT29F32G08CBABA 1 Reserved (0)
No SLC MT29F1G08AACWP 1 0
Yes MLC MT29F32G08CBADA 1 08h
Yes MLC MT29F64G08CBABA 2 08h
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
Acked-by: Huang Shijie <b32955@freescale.com>
Diffstat (limited to 'include/linux/mtd')
| -rw-r--r-- | include/linux/mtd/nand.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/mtd/nand.h b/include/linux/mtd/nand.h index 267d61dd89dd..3080a8c8b62e 100644 --- a/include/linux/mtd/nand.h +++ b/include/linux/mtd/nand.h @@ -219,6 +219,9 @@ struct nand_chip; /* ONFI feature address */ #define ONFI_FEATURE_ADDR_TIMING_MODE 0x1 +/* Vendor-specific feature address (Micron) */ +#define ONFI_FEATURE_ADDR_READ_RETRY 0x89 + /* ONFI subfeature parameters length */ #define ONFI_SUBFEATURE_PARAM_LEN 4 |