Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-12-30 14:52:05 +00:00
Code Issues Packages Projects Releases Wiki Activity

mtd: spi-nor: wait until lock/unlock operations are ready

Browse Source 
On Micron and Numonyx devices, the status register write command
(WRSR), raises a work-in-progress bit (WIP) on the status register.
The datasheets for these devices specify that while the status
register write is in progress, the status register WIP bit can still
be read to check the end of the operation.

This commit adds a wait_till_ready call on lock/unlock operations,
which is required for Micron and Numonyx but should be harmless for
others. This is needed to prevent applications from issuing erase or
program operations before the unlock operation is completed.

Reported-by: Stas Sergeev <stsp@list.ru>
Signed-off-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
This commit is contained in:
Ezequiel García 2015-12-28 17:54:51 -03:00 committed by Brian Norris
parent 6e75632ac3
commit 32321e950d
1 changed files with 10 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
drivers/mtd/spi-nor/spi-nor.c
View File

@ -481,6 +481,7 @@ static int stm_lock(struct spi_nor *nor, loff_t ofs, uint64_t len)
int status_old, status_new;
u8 mask = SR_BP2 | SR_BP1 | SR_BP0;
u8 shift = ffs(mask) - 1, pow, val;
int ret;
status_old = read_sr(nor);
if (status_old < 0)
@ -519,7 +520,10 @@ static int stm_lock(struct spi_nor *nor, loff_t ofs, uint64_t len)
return -EINVAL;
write_enable(nor);
return write_sr(nor, status_new);
ret = write_sr(nor, status_new);
if (ret)
return ret;
return spi_nor_wait_till_ready(nor);
}
/*
@ -533,6 +537,7 @@ static int stm_unlock(struct spi_nor *nor, loff_t ofs, uint64_t len)
int status_old, status_new;
u8 mask = SR_BP2 | SR_BP1 | SR_BP0;
u8 shift = ffs(mask) - 1, pow, val;
int ret;
status_old = read_sr(nor);
if (status_old < 0)
@ -569,7 +574,10 @@ static int stm_unlock(struct spi_nor *nor, loff_t ofs, uint64_t len)
return -EINVAL;
write_enable(nor);
return write_sr(nor, status_new);
ret = write_sr(nor, status_new);
if (ret)
return ret;
return spi_nor_wait_till_ready(nor);
}
/*