linux-kernel - Re: [PATCH v3 1/2] mtd: spi-nor: add support to non-uniform SFDP SPI NOR flash memories

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Date:   Mon, 22 Oct 2018 12:26:59 +0200
From:   Boris Brezillon <boris.brezillon@...tlin.com>
To:     Yogesh Narayan Gaur <yogeshnarayan.gaur@....com>
Cc:     Tudor Ambarus <tudor.ambarus@...rochip.com>,
        "richard@....at" <richard@....at>, Mark Brown <broonie@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "nicolas.ferre@...rochip.com" <nicolas.ferre@...rochip.com>,
        "marek.vasut@...il.com" <marek.vasut@...il.com>,
        "cyrille.pitchen@...rochip.com" <cyrille.pitchen@...rochip.com>,
        "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
        "Cristian.Birsan@...rochip.com" <Cristian.Birsan@...rochip.com>,
        Cyrille Pitchen <cyrille.pitchen@...ev4u.fr>,
        "computersforpeace@...il.com" <computersforpeace@...il.com>,
        "dwmw2@...radead.org" <dwmw2@...radead.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v3 1/2] mtd: spi-nor: add support to non-uniform SFDP
 SPI NOR flash memories

On Mon, 22 Oct 2018 10:03:55 +0000
Yogesh Narayan Gaur <yogeshnarayan.gaur@....com> wrote:

> --- a/drivers/mtd/spi-nor/spi-nor.c
> +++ b/drivers/mtd/spi-nor/spi-nor.c
> @@ -2863,26 +2863,36 @@ static u8 spi_nor_smpt_read_dummy(const struct spi_nor *nor, const u32 settings)
>   * @nor:       pointer to a 'struct spi_nor'
>   * @smpt:      pointer to the sector map parameter table
>   */
> -static const u32 *spi_nor_get_map_in_use(struct spi_nor *nor, const u32 *smpt)
> +static const u32 *spi_nor_get_map_in_use(struct spi_nor *nor, const u32 *smpt, u32 smpt_len)
>  {
>         const u32 *ret = NULL;
> -       u32 i, addr;
> +       u32 i, addr, nmaps;
>         int err;
>         u8 addr_width, read_opcode, read_dummy;
>         u8 read_data_mask, data_byte, map_id;
> +       bool map_id_is_valid = false;
> 
>         addr_width = nor->addr_width;
>         read_dummy = nor->read_dummy;
>         read_opcode = nor->read_opcode;
> 
> +       pr_info("Start [addr_width:%08x, read_dumy:%0x8, read_opcode:%08x]\n", nor->addr_width, nor->read_dummy, nor->read_opcode);
> +
> +       for (i = 0; i<smpt_len; i++)
> +               pr_info("%s:%i smpt[%d]=%08x\n", __func__, __LINE__, i, smpt[i]);
> +
>         map_id = 0;
> -       i = 0;
>         /* Determine if there are any optional Detection Command Descriptors */
> -       while (!(smpt[i] & SMPT_DESC_TYPE_MAP)) {
> +       for (i = 0; i< smpt_len; i++) {

				   ^ i += 2) {

> +               if ((smpt[i] & SMPT_DESC_TYPE_MAP))
> +                       break;
> +
>                 read_data_mask = SMPT_CMD_READ_DATA(smpt[i]);
>                 nor->addr_width = spi_nor_smpt_addr_width(nor, smpt[i]);
>                 nor->read_dummy = spi_nor_smpt_read_dummy(nor, smpt[i]);
>                 nor->read_opcode = SMPT_CMD_OPCODE(smpt[i]);
> +               pr_info("smpt[%d]=[addr_width:%08x, read_dumy:%0x8, read_opcode:%08x]\n", i, nor->addr_width, nor->read_dummy, nor->read_opcode);
> +
>                 addr = smpt[i + 1];
> 
>                 err = spi_nor_read_raw(nor, addr, 1, &data_byte);
> @@ -2894,18 +2904,36 @@ static const u32 *spi_nor_get_map_in_use(struct spi_nor *nor, const u32 *smpt)
>                  * Configuration that is currently in use.
>                  */
>                 map_id = map_id << 1 | !!(data_byte & read_data_mask);
> +               map_id_is_valid = true;
>                 i = i + 2;

Drop the above line (i = i + 2).

>         }
> 
> -       /* Find the matching configuration map */
> -       while (SMPT_MAP_ID(smpt[i]) != map_id) {
> -               if (smpt[i] & SMPT_DESC_END)
> -                       goto out;
> +       if (map_id_is_valid)
> +               pr_info("%s:%i map_id=%d\n", __func__, __LINE__, map_id);
> +       else
> +               pr_info("%s:%i NO map_id\n", __func__, __LINE__);
> +
> +       for (nmaps = 0; i< smpt_len; nmaps++) {
> +               if((smpt[i] & SMPT_DESC_TYPE_MAP))
> +                       continue;
> +
> +               if(!map_id_is_valid) {
> +                       if (nmaps) {
> +                               ret = NULL;
> +                               break;
> +                       }
> +
> +                       ret = smpt+i;
> +               } else if (map_id == SMPT_MAP_ID(smpt[i])) {
> +                       ret = smpt+i;
> +                       break;
> +               }
> +
>                 /* increment the table index to the next map */
>                 i += SMPT_MAP_REGION_COUNT(smpt[i]) + 1;
>         }
> 
> -       ret = smpt + i;
> +       pr_info("End [addr_width:%08x, read_dumy:%0x8, read_opcode:%08x]\n", nor->addr_width, nor->read_dummy, nor->read_opcode);
>         /* fall through */
>  out:
>         nor->addr_width = addr_width;