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Date: Fri, 25 Feb 2022 01:21:39 +0530
From: Pratyush Yadav <p.yadav@...com>
To: Tudor Ambarus <tudor.ambarus@...rochip.com>
CC: <michael@...le.cc>, <Takahiro.Kuwano@...ineon.com>,
<miquel.raynal@...tlin.com>, <richard@....at>, <vigneshr@...com>,
<linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
<nicolas.ferre@...rochip.com>, <zhengxunli@...c.com.tw>,
<jaimeliao@...c.com.tw>, <Bacem.Daassi@...ineon.com>
Subject: Re: [PATCH 2/3] mtd: spi-nor: micron-st: Rework
spi_nor_micron_octal_dtr_enable()
Hi Tudor,
On 10/02/22 04:33AM, Tudor Ambarus wrote:
> Introduce template operation to remove code duplication.
> Split spi_nor_micron_octal_dtr_enable() in spi_nor_micron_octal_dtr_en()
> and spi_nor_micron_octal_dtr_dis() as it no longer made sense to try to
> keep everything alltogether: too many "if (enable)" throughout the code,
> which made the code difficult to follow.
>
> Signed-off-by: Tudor Ambarus <tudor.ambarus@...rochip.com>
> ---
> drivers/mtd/spi-nor/micron-st.c | 105 +++++++++++++++++---------------
> 1 file changed, 55 insertions(+), 50 deletions(-)
>
> diff --git a/drivers/mtd/spi-nor/micron-st.c b/drivers/mtd/spi-nor/micron-st.c
> index 7f66b5943ceb..013aa6a52737 100644
> --- a/drivers/mtd/spi-nor/micron-st.c
> +++ b/drivers/mtd/spi-nor/micron-st.c
> @@ -17,73 +17,72 @@
> #define SPINOR_MT_OCT_DTR 0xe7 /* Enable Octal DTR. */
> #define SPINOR_MT_EXSPI 0xff /* Enable Extended SPI (default) */
>
> -static int spi_nor_micron_octal_dtr_enable(struct spi_nor *nor, bool enable)
> +/* Micron ST SPI NOR flash operations. */
> +#define SPI_NOR_MICRON_WR_ANY_REG_OP(naddr, addr, ndata, buf) \
Should change function and variable names based on mwalle's patches
(assuming you agree with that scheme). MICRON_NOR_WR_ANY_REG_OP?
> + SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_MT_WR_ANY_REG, 0), \
> + SPI_MEM_OP_ADDR(naddr, addr, 0), \
> + SPI_MEM_OP_NO_DUMMY, \
> + SPI_MEM_OP_DATA_OUT(ndata, buf, 0))
> +
> +static int spi_nor_micron_octal_dtr_en(struct spi_nor *nor)
micron_nor_octal_dtr_en(). Same for other functions.
> {
> struct spi_mem_op op;
> u8 *buf = nor->bouncebuf;
> int ret;
>
> - if (enable) {
> - /* Use 20 dummy cycles for memory array reads. */
> - ret = spi_nor_write_enable(nor);
> - if (ret)
> - return ret;
> -
> - *buf = 20;
> - op = (struct spi_mem_op)
> - SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_MT_WR_ANY_REG, 1),
> - SPI_MEM_OP_ADDR(3, SPINOR_REG_MT_CFR1V, 1),
> - SPI_MEM_OP_NO_DUMMY,
> - SPI_MEM_OP_DATA_OUT(1, buf, 1));
> -
> - ret = spi_mem_exec_op(nor->spimem, &op);
> - if (ret)
> - return ret;
> + /* Use 20 dummy cycles for memory array reads. */
> + *buf = 20;
> + op = (struct spi_mem_op)
> + SPI_NOR_MICRON_WR_ANY_REG_OP(3, SPINOR_REG_MT_CFR1V, 1, buf);
> + ret = spi_nor_write_reg(nor, &op, nor->reg_proto);
> + if (ret)
> + return ret;
> + ret = spi_nor_wait_till_ready(nor);
> + if (ret)
> + return ret;
>
> - ret = spi_nor_wait_till_ready(nor);
> - if (ret)
> - return ret;
> - }
> + buf[0] = SPINOR_MT_OCT_DTR;
> + op = (struct spi_mem_op)
> + SPI_NOR_MICRON_WR_ANY_REG_OP(3, SPINOR_REG_MT_CFR0V, 1, buf);
> + ret = spi_nor_write_reg(nor, &op, nor->reg_proto);
> + if (ret)
> + return ret;
>
> - ret = spi_nor_write_enable(nor);
> + /* Read flash ID to make sure the switch was successful. */
> + ret = spi_nor_read_id(nor, 0, 8, buf, SNOR_PROTO_8_8_8_DTR);
> if (ret)
> return ret;
>
> - if (enable) {
> - buf[0] = SPINOR_MT_OCT_DTR;
> - } else {
> - /*
> - * The register is 1-byte wide, but 1-byte transactions are not
> - * allowed in 8D-8D-8D mode. The next register is the dummy
> - * cycle configuration register. Since the transaction needs to
> - * be at least 2 bytes wide, set the next register to its
> - * default value. This also makes sense because the value was
> - * changed when enabling 8D-8D-8D mode, it should be reset when
> - * disabling.
> - */
> - buf[0] = SPINOR_MT_EXSPI;
> - buf[1] = SPINOR_REG_MT_CFR1V_DEF;
> - }
> + if (memcmp(buf, nor->info->id, nor->info->id_len))
> + return -EINVAL;
>
> - op = (struct spi_mem_op)
> - SPI_MEM_OP(SPI_MEM_OP_CMD(SPINOR_OP_MT_WR_ANY_REG, 1),
> - SPI_MEM_OP_ADDR(enable ? 3 : 4,
> - SPINOR_REG_MT_CFR0V, 1),
> - SPI_MEM_OP_NO_DUMMY,
> - SPI_MEM_OP_DATA_OUT(enable ? 1 : 2, buf, 1));
> + return 0;
> +}
>
> - if (!enable)
> - spi_nor_spimem_setup_op(nor, &op, SNOR_PROTO_8_8_8_DTR);
> +static int spi_nor_micron_octal_dtr_dis(struct spi_nor *nor)
> +{
> + struct spi_mem_op op;
> + u8 *buf = nor->bouncebuf;
> + int ret;
>
> - ret = spi_mem_exec_op(nor->spimem, &op);
> + /*
> + * The register is 1-byte wide, but 1-byte transactions are not allowed
> + * in 8D-8D-8D mode. The next register is the dummy cycle configuration
> + * register. Since the transaction needs to be at least 2 bytes wide,
> + * set the next register to its default value. This also makes sense
> + * because the value was changed when enabling 8D-8D-8D mode, it should
> + * be reset when disabling.
> + */
> + buf[0] = SPINOR_MT_EXSPI;
> + buf[1] = SPINOR_REG_MT_CFR1V_DEF;
> + op = (struct spi_mem_op)
> + SPI_NOR_MICRON_WR_ANY_REG_OP(4, SPINOR_REG_MT_CFR0V, 2, buf);
> + ret = spi_nor_write_reg(nor, &op, SNOR_PROTO_8_8_8_DTR);
> if (ret)
> return ret;
>
> /* Read flash ID to make sure the switch was successful. */
> - if (enable)
> - ret = spi_nor_read_id(nor, 0, 8, buf, SNOR_PROTO_8_8_8_DTR);
> - else
> - ret = spi_nor_read_id(nor, 0, 0, buf, nor->reg_proto);
> + ret = spi_nor_read_id(nor, 0, 0, buf, nor->reg_proto);
nor->reg_proto is not updated yet. It will be updated _after_ this
function completes. So you would end up calling read ID in 8D-8D-8D
mode, which would be bogus.
I tried with Micron MT35XU512ABA. Enable works fine, but disable fails
(it succeeds in reality but the function is unable to verify that)
because of this. Changing nor->reg_proto to SNOR_PROTO_1_1_1 fixes it.
Looks like the problem is not introduced by this patch though. It seems
to come from patch 5 of your mx66 series. I see the same with the
Cypress flash too but I have not tested it yet.
> if (ret)
> return ret;
>
> @@ -93,6 +92,12 @@ static int spi_nor_micron_octal_dtr_enable(struct spi_nor *nor, bool enable)
> return 0;
> }
>
> +static int spi_nor_micron_octal_dtr_enable(struct spi_nor *nor, bool enable)
> +{
> + return enable ? spi_nor_micron_octal_dtr_en(nor) :
> + spi_nor_micron_octal_dtr_dis(nor);
> +}
> +
> static void mt35xu512aba_default_init(struct spi_nor *nor)
> {
> nor->params->octal_dtr_enable = spi_nor_micron_octal_dtr_enable;
> --
> 2.25.1
>
--
Regards,
Pratyush Yadav
Texas Instruments Inc.
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