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spi: spi-cadence-quadspi: add mram unlock path

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Signed-off-by: Heinrich Toews <ht@twx-software.de>
This commit is contained in:
Heinrich Toews
2026-02-17 12:55:46 +01:00
parent a0085a9cb9
commit 50d61d9673
1 changed files with 11 additions and 2 deletions
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drivers/mtd/spi-nor/everspin.c
+11 -2
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@@ -49,8 +49,17 @@ static void everspin_mram_default_init(struct spi_nor *nor)
u8 sr1 = nor->bouncebuf[0];
u8 bp_bits = (sr1 & GENMASK(5, 2)) >> 2;
dev_info(nor->dev, "SR1: 0x%02x | BP bits: 0x%x (0 = no protection)\n", sr1, bp_bits);
if (bp_bits)
dev_warn(nor->dev, "Hardware write protection (BP bits) is active!\n");
if (bp_bits) {
dev_info(nor->dev, "Unlocking MRAM (clearing BP bits)...\n");
spi_nor_write_enable(nor);
nor->bouncebuf[0] = 0;
op = (struct spi_mem_op)
SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_WRSR, 1),
SPI_MEM_OP_NO_ADDR,
SPI_MEM_OP_NO_DUMMY,
SPI_MEM_OP_DATA_OUT(1, nor->bouncebuf, 1));
spi_nor_write_any_volatile_reg(nor, &op, nor->reg_proto);
}
}
/* 2. Switch to Octal Mode via CFR1V */