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Message-ID: <dd899747-f1eb-2253-9677-8d82c9f73ea6@microchip.com>
Date: Thu, 1 Oct 2020 08:38:38 +0000
From: <Tudor.Ambarus@...rochip.com>
To: <p.yadav@...com>, <miquel.raynal@...tlin.com>, <richard@....at>,
<vigneshr@...com>, <linux-mtd@...ts.infradead.org>,
<linux-kernel@...r.kernel.org>
CC: <nsekhar@...com>, <boris.brezillon@...labora.com>
Subject: Re: [PATCH v14 15/15] mtd: spi-nor: micron-st: allow using
MT35XU512ABA in Octal DTR mode
On 9/30/20 9:57 PM, Pratyush Yadav wrote:
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the content is safe
>
> Since this flash doesn't have a Profile 1.0 table, the Octal DTR
> capabilities are enabled in the post SFDP fixup, along with the 8D-8D-8D
> fast read settings.
>
> Enable Octal DTR mode with 20 dummy cycles to allow running at the
> maximum supported frequency of 200Mhz.
>
> The flash supports the soft reset sequence. So, add the flag in the
> flash's info.
>
> Signed-off-by: Pratyush Yadav <p.yadav@...com>
> ---
> drivers/mtd/spi-nor/micron-st.c | 100 +++++++++++++++++++++++++++++++-
> 1 file changed, 99 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mtd/spi-nor/micron-st.c b/drivers/mtd/spi-nor/micron-st.c
> index ef3695080710..b0002c29fd37 100644
> --- a/drivers/mtd/spi-nor/micron-st.c
> +++ b/drivers/mtd/spi-nor/micron-st.c
> @@ -8,10 +8,108 @@
>
> #include "core.h"
>
> +#define SPINOR_OP_MT_DTR_RD 0xfd /* Fast Read opcode in DTR mode */
> +#define SPINOR_OP_MT_RD_ANY_REG 0x85 /* Read volatile register */
> +#define SPINOR_OP_MT_WR_ANY_REG 0x81 /* Write volatile register */
> +#define SPINOR_REG_MT_CFR0V 0x00 /* For setting octal DTR mode */
> +#define SPINOR_REG_MT_CFR1V 0x01 /* For setting dummy cycles */
> +#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)
> +{
> + 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;
> +
> + ret = spi_nor_wait_till_ready(nor);
> + if (ret)
> + return ret;
> + }
> +
> + ret = spi_nor_write_enable(nor);
> + if (ret)
> + return ret;
> +
> + if (enable)
> + *buf = SPINOR_MT_OCT_DTR;
> + else
> + *buf = SPINOR_MT_EXSPI;
> +
> + 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(1, buf, 1));
> +
> + if (!enable)
> + spi_nor_spimem_setup_op(nor, &op, SNOR_PROTO_8_8_8_DTR);
> +
> + ret = spi_mem_exec_op(nor->spimem, &op);
> + if (ret)
> + return ret;
> +
> + /* Give some time for the mode change to take place. */
> + usleep_range(400, 600);
Don't we need to still read the Status Register here? The same question
applies for the previous patch.
> +
> + return 0;
> +}
> +
> +static void mt35xu512aba_default_init(struct spi_nor *nor)
> +{
> + nor->params->octal_dtr_enable = spi_nor_micron_octal_dtr_enable;
> +}
> +
> +static void mt35xu512aba_post_sfdp_fixup(struct spi_nor *nor)
> +{
> + /* Set the Fast Read settings. */
> + nor->params->hwcaps.mask |= SNOR_HWCAPS_READ_8_8_8_DTR;
> + spi_nor_set_read_settings(&nor->params->reads[SNOR_CMD_READ_8_8_8_DTR],
> + 0, 20, SPINOR_OP_MT_DTR_RD,
> + SNOR_PROTO_8_8_8_DTR);
> +
> + nor->cmd_ext_type = SPI_NOR_EXT_REPEAT;
> + nor->params->rdsr_dummy = 8;
> + nor->params->rdsr_addr_nbytes = 0;
> +
> + /*
> + * The BFPT quad enable field is set to a reserved value so the quad
> + * enable function is ignored by spi_nor_parse_bfpt(). Make sure we
> + * disable it.
> + */
> + nor->params->quad_enable = NULL;
> +}
> +
> +static struct spi_nor_fixups mt35xu512aba_fixups = {
> + .default_init = mt35xu512aba_default_init,
> + .post_sfdp = mt35xu512aba_post_sfdp_fixup,
> +};
> +
> static const struct flash_info micron_parts[] = {
> { "mt35xu512aba", INFO(0x2c5b1a, 0, 128 * 1024, 512,
> SECT_4K | USE_FSR | SPI_NOR_OCTAL_READ |
> - SPI_NOR_4B_OPCODES) },
> + SPI_NOR_4B_OPCODES | SPI_NOR_OCTAL_DTR_READ |
> + SPI_NOR_OCTAL_DTR_PP |
> + SPI_NOR_IO_MODE_EN_VOLATILE)
> + .fixups = &mt35xu512aba_fixups},
> { "mt35xu02g", INFO(0x2c5b1c, 0, 128 * 1024, 2048,
> SECT_4K | USE_FSR | SPI_NOR_OCTAL_READ |
> SPI_NOR_4B_OPCODES) },
> --
> 2.28.0
>
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