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mtd: spi-nor: spansion: preserve CFR2V[7] when writing MEMLAT
CFR2V[7] is assigned to Flash's address mode (3- or 4-ybte) and must not
be changed when writing MEMLAT (CFR2V[3:0]). CFR2V shall be used in a read,
update, write back fashion.
Fixes: c3266af101
("mtd: spi-nor: spansion: add support for Cypress Semper flash")
Signed-off-by: Takahiro Kuwano <Takahiro.Kuwano@infineon.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20230726075257.12985-3-tudor.ambarus@linaro.org
Signed-off-by: Tudor Ambarus <tudor.ambarus@linaro.org>
This commit is contained in:
parent
d534fd9787
commit
1e611e104b
1 changed files with 13 additions and 1 deletions
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@ -4,6 +4,7 @@
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* Copyright (C) 2014, Freescale Semiconductor, Inc.
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*/
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#include <linux/bitfield.h>
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#include <linux/device.h>
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#include <linux/mtd/spi-nor.h>
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@ -28,6 +29,7 @@
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#define SPINOR_REG_CYPRESS_CFR2 0x3
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#define SPINOR_REG_CYPRESS_CFR2V \
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(SPINOR_REG_CYPRESS_VREG + SPINOR_REG_CYPRESS_CFR2)
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#define SPINOR_REG_CYPRESS_CFR2_MEMLAT_MASK GENMASK(3, 0)
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#define SPINOR_REG_CYPRESS_CFR2_MEMLAT_11_24 0xb
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#define SPINOR_REG_CYPRESS_CFR2_ADRBYT BIT(7)
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#define SPINOR_REG_CYPRESS_CFR3 0x4
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@ -161,8 +163,18 @@ static int cypress_nor_octal_dtr_en(struct spi_nor *nor)
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int ret;
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u8 addr_mode_nbytes = nor->params->addr_mode_nbytes;
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op = (struct spi_mem_op)
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CYPRESS_NOR_RD_ANY_REG_OP(addr_mode_nbytes,
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SPINOR_REG_CYPRESS_CFR2V, 0, buf);
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ret = spi_nor_read_any_reg(nor, &op, nor->reg_proto);
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if (ret)
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return ret;
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/* Use 24 dummy cycles for memory array reads. */
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*buf = SPINOR_REG_CYPRESS_CFR2_MEMLAT_11_24;
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*buf &= ~SPINOR_REG_CYPRESS_CFR2_MEMLAT_MASK;
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*buf |= FIELD_PREP(SPINOR_REG_CYPRESS_CFR2_MEMLAT_MASK,
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SPINOR_REG_CYPRESS_CFR2_MEMLAT_11_24);
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op = (struct spi_mem_op)
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CYPRESS_NOR_WR_ANY_REG_OP(addr_mode_nbytes,
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SPINOR_REG_CYPRESS_CFR2V, 1, buf);
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