According the datasheet [1] the WEL is automatically reset after the Byte-Program instruction completion. So if we program the device with byte-size set to 32 and starting from an odd address only the first and the last byte is written. Fix this by (re-)anble the write support for the first SPINOR_OP_AAI_WP sequence.
[1] http://ww1.microchip.com/downloads/en/DeviceDoc/20005044C.pdf; "4.3.2 WRITE ENABLE LATCH (WEL)" Signed-off-by: Marco Felsch <m.fel...@pengutronix.de> --- drivers/mtd/spi-nor/sst.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/mtd/spi-nor/sst.c b/drivers/mtd/spi-nor/sst.c index e0af6d25d573..644252e27a2a 100644 --- a/drivers/mtd/spi-nor/sst.c +++ b/drivers/mtd/spi-nor/sst.c @@ -79,6 +79,13 @@ static int sst_write(struct mtd_info *mtd, loff_t to, size_t len, /* Write out most of the data here. */ for (; actual < len - 1; actual += 2) { + /* Enable write support if odd address was written before */ + if (actual == 1) { + ret = spi_nor_write_enable(nor); + if (ret) + goto out; + } + nor->program_opcode = SPINOR_OP_AAI_WP; /* write two bytes. */ -- 2.20.1
