linux-kernel - Re: [PATCH 1/6] mtd: spi-nor: Add quad page program support

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Date:   Mon, 29 Aug 2016 18:54:57 +0530
From:   Jagan Teki <jagannadh.teki@...il.com>
To:     "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>
Cc:     David Woodhouse <dwmw2@...radead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Jagan Teki <jteki@...nedev.com>,
        Brian Norris <computersforpeace@...il.com>
Subject: Re: [PATCH 1/6] mtd: spi-nor: Add quad page program support

On Wed, Aug 10, 2016 at 2:10 AM, Jagan Teki <jteki@...nedev.com> wrote:
> Add quad page program support with the use of nor->flags
> and then controller will use 4 lines for data transmission
> which is quite faster than page program(02h)
>
> Cc: Brian Norris <computersforpeace@...il.com>
> Signed-off-by: Jagan Teki <jteki@...nedev.com>
> ---
>  drivers/mtd/spi-nor/spi-nor.c | 13 +++++++++++++
>  include/linux/mtd/spi-nor.h   |  2 ++
>  2 files changed, 15 insertions(+)
>
> diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
> index d0fc165..f88bd7e 100644
> --- a/drivers/mtd/spi-nor/spi-nor.c
> +++ b/drivers/mtd/spi-nor/spi-nor.c
> @@ -75,6 +75,7 @@ struct flash_info {
>                                          * bit. Must be used with
>                                          * SPI_NOR_HAS_LOCK.
>                                          */
> +#define SPI_NOR_QUAD_WRITE     BIT(10) /* Flash supports Quad Write */
>  };
>
>  #define JEDEC_MFR(info)        ((info)->id[0])
> @@ -1306,6 +1307,7 @@ int spi_nor_scan(struct spi_nor *nor, const char *name, enum read_mode mode)
>         struct device *dev = nor->dev;
>         struct mtd_info *mtd = &nor->mtd;
>         struct device_node *np = spi_nor_get_flash_node(nor);
> +       bool need_quad = false;
>         int ret;
>         int i;
>
> @@ -1441,6 +1443,7 @@ int spi_nor_scan(struct spi_nor *nor, const char *name, enum read_mode mode)
>                         return ret;
>                 }
>                 nor->flash_read = SPI_NOR_QUAD;
> +               need_quad = true;
>         } else if (mode == SPI_NOR_DUAL && info->flags & SPI_NOR_DUAL_READ) {
>                 nor->flash_read = SPI_NOR_DUAL;
>         }
> @@ -1465,6 +1468,16 @@ int spi_nor_scan(struct spi_nor *nor, const char *name, enum read_mode mode)
>         }
>
>         nor->program_opcode = SPINOR_OP_PP;
> +       if (nor->flags == SNOR_F_USE_QPP && info->flags & SPI_NOR_QUAD_WRITE) {
> +               if (!need_quad)
> +                       ret = set_quad_mode(nor, info);
> +                       if (ret) {
> +                               dev_err(dev, "quad mode not supported\n");
> +                               return ret;
> +                       }
> +               }
> +               nor->program_opcode = SPINOR_OP_QPP;
> +       }
>
>         if (info->addr_width)
>                 nor->addr_width = info->addr_width;
> diff --git a/include/linux/mtd/spi-nor.h b/include/linux/mtd/spi-nor.h
> index c425c7b..aa0e6cd 100644
> --- a/include/linux/mtd/spi-nor.h
> +++ b/include/linux/mtd/spi-nor.h
> @@ -46,6 +46,7 @@
>  #define SPINOR_OP_READ_1_1_2   0x3b    /* Read data bytes (Dual SPI) */
>  #define SPINOR_OP_READ_1_1_4   0x6b    /* Read data bytes (Quad SPI) */
>  #define SPINOR_OP_PP           0x02    /* Page program (up to 256 bytes) */
> +#define SPINOR_OP_QPP          0x32    /* Quad Page program */
>  #define SPINOR_OP_BE_4K                0x20    /* Erase 4KiB block */
>  #define SPINOR_OP_BE_4K_PMC    0xd7    /* Erase 4KiB block on PMC chips */
>  #define SPINOR_OP_BE_32K       0x52    /* Erase 32KiB block */
> @@ -119,6 +120,7 @@ enum spi_nor_ops {
>  enum spi_nor_option_flags {
>         SNOR_F_USE_FSR          = BIT(0),
>         SNOR_F_HAS_SR_TB        = BIT(1),
> +       SNOR_F_USE_QPP          = BIT(2),
>  };
>
>  /**
> --
> 2.7.4
>

Ping!

-- 
Jagan Teki