[PATCH 03/15] mtd: st_spi_fsm: Update Macronix 'QE' configuration
From: Lee Jones <hidden>
Date: 2014-03-26 16:45:50
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Subsystem:
memory technology devices (mtd), the rest · Maintainers:
Miquel Raynal, Richard Weinberger, Vignesh Raghavendra, Linus Torvalds
From: Angus Clark <redacted> Update the configuration of the Macronix 'QE' bit, such that we only set or clear the bit if required. Signed-off-by: Angus Clark <redacted> Signed-off-by: Lee Jones <redacted> --- drivers/mtd/devices/st_spi_fsm.c | 23 +++++++++++++++++++---- 1 file changed, 19 insertions(+), 4 deletions(-)
diff --git a/drivers/mtd/devices/st_spi_fsm.c b/drivers/mtd/devices/st_spi_fsm.c
index 31bbf28..fabba2c 100644
--- a/drivers/mtd/devices/st_spi_fsm.c
+++ b/drivers/mtd/devices/st_spi_fsm.c@@ -1163,12 +1163,27 @@ 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;
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1.8.3.2