diff options
| -rw-r--r-- | drivers/mtd/nand/raw/arasan-nand-controller.c | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/drivers/mtd/nand/raw/arasan-nand-controller.c b/drivers/mtd/nand/raw/arasan-nand-controller.c index d5fab3cbaa54..307300eeb9cb 100644 --- a/drivers/mtd/nand/raw/arasan-nand-controller.c +++ b/drivers/mtd/nand/raw/arasan-nand-controller.c @@ -53,6 +53,7 @@ #define PROG_RST BIT(8) #define PROG_GET_FEATURE BIT(9) #define PROG_SET_FEATURE BIT(10) +#define PROG_CHG_RD_COL_ENH BIT(14) #define INTR_STS_EN_REG 0x14 #define INTR_SIG_EN_REG 0x18 @@ -622,7 +623,23 @@ static int anfc_param_read_type_exec(struct nand_chip *chip, static int anfc_data_read_type_exec(struct nand_chip *chip, const struct nand_subop *subop) { - return anfc_misc_data_type_exec(chip, subop, PROG_PGRD); + u32 prog_reg = PROG_PGRD; + + /* + * Experience shows that while in SDR mode sending a CHANGE READ COLUMN + * command through the READ PAGE "type" always works fine, when in + * NV-DDR mode the same command simply fails. However, it was also + * spotted that any CHANGE READ COLUMN command sent through the CHANGE + * READ COLUMN ENHANCED "type" would correctly work in both cases (SDR + * and NV-DDR). So, for simplicity, let's program the controller with + * the CHANGE READ COLUMN ENHANCED "type" whenever we are requested to + * perform a CHANGE READ COLUMN operation. + */ + if (subop->instrs[0].ctx.cmd.opcode == NAND_CMD_RNDOUT && + subop->instrs[2].ctx.cmd.opcode == NAND_CMD_RNDOUTSTART) + prog_reg = PROG_CHG_RD_COL_ENH; + + return anfc_misc_data_type_exec(chip, subop, prog_reg); } static int anfc_param_write_type_exec(struct nand_chip *chip, |