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| author | Angus Clark <angus.clark@st.com> | 2014-03-26 16:39:17 +0000 |
|---|---|---|
| committer | Brian Norris <computersforpeace@gmail.com> | 2014-04-14 11:22:59 -0700 |
| commit | cc6668637ebed620eaafc807802f3d85b193f534 (patch) | |
| tree | 0465203ccba705e77131e9bcdb8a3c143f490078 | |
| parent | 009e7e61b1f15b16964f1b4b6bb1e30e6b03dc3b (diff) | |
| download | linux-cc6668637ebed620eaafc807802f3d85b193f534.tar.gz | |
mtd: st_spi_fsm: Update Macronix 'QE' configuration
Update the configuration of the Macronix 'QE' bit, such that we only set or clear the bit if required. Signed-off-by: Angus Clark <angus.clark@st.com> Signed-off-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Brian Norris <computersforpeace@gmail.com>
| -rw-r--r-- | drivers/mtd/devices/st_spi_fsm.c | 23 |
1 files changed, 19 insertions, 4 deletions
diff --git a/drivers/mtd/devices/st_spi_fsm.c b/drivers/mtd/devices/st_spi_fsm.c index 40eb830eea21..f86d3e01433b 100644 --- a/drivers/mtd/devices/st_spi_fsm.c +++ b/drivers/mtd/devices/st_spi_fsm.c @@ -1164,12 +1164,27 @@ static int stfsm_mx25_config(struct stfsm *fsm) CFG_ERASESEC_TOGGLE_32BIT_ADDR); } - /* For QUAD mode, set 'QE' STATUS bit */ + /* Check status of 'QE' bit */ + stfsm_read_status(fsm, FLASH_CMD_RDSR, &sta); data_pads = ((fsm->stfsm_seq_read.seq_cfg >> 16) & 0x3) + 1; if (data_pads == 4) { - stfsm_read_status(fsm, FLASH_CMD_RDSR, &sta); - sta |= MX25_STATUS_QE; - stfsm_write_status(fsm, sta, 1); + if (!(sta & MX25_STATUS_QE)) { + /* Set 'QE' */ + sta |= MX25_STATUS_QE; + + stfsm_write_status(fsm, sta, 1); + + stfsm_wait_busy(fsm); + } + } else { + if (sta & MX25_STATUS_QE) { + /* Clear 'QE' */ + sta &= ~MX25_STATUS_QE; + + stfsm_write_status(fsm, sta, 1); + + stfsm_wait_busy(fsm); + } } return 0; |