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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>
This commit is contained in:
Angus Clark 2014-03-26 16:39:17 +00:00 committed by Brian Norris
parent 009e7e61b1
commit cc6668637e
1 changed files with 19 additions and 4 deletions
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23
drivers/mtd/devices/st_spi_fsm.c
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@ -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;