Re: [PATCH v3 1/2] mtd: spi-nor: add support to non-uniform SFDP SPI NOR flash memories
From: Boris Brezillon
Date: Mon Oct 22 2018 - 06:10:59 EST
On Mon, 22 Oct 2018 10:03:55 +0000
Yogesh Narayan Gaur <yogeshnarayan.gaur@xxxxxxx> wrote:
> Hi,
>
>
> > -----Original Message-----
> > From: Boris Brezillon [mailto:boris.brezillon@xxxxxxxxxxx]
> > Sent: Monday, October 22, 2018 2:46 PM
> > To: Yogesh Narayan Gaur <yogeshnarayan.gaur@xxxxxxx>
> > Cc: Tudor Ambarus <tudor.ambarus@xxxxxxxxxxxxx>; richard@xxxxxx; Mark
> > Brown <broonie@xxxxxxxxxx>; linux-kernel@xxxxxxxxxxxxxxx;
> > nicolas.ferre@xxxxxxxxxxxxx; marek.vasut@xxxxxxxxx;
> > cyrille.pitchen@xxxxxxxxxxxxx; linux-mtd@xxxxxxxxxxxxxxxxxxx;
> > Cristian.Birsan@xxxxxxxxxxxxx; Cyrille Pitchen <cyrille.pitchen@xxxxxxxxxx>;
> > computersforpeace@xxxxxxxxx; dwmw2@xxxxxxxxxxxxx; linux-arm-
> > kernel@xxxxxxxxxxxxxxxxxxx
> > Subject: Re: [PATCH v3 1/2] mtd: spi-nor: add support to non-uniform SFDP SPI
> > NOR flash memories
> >
> > On Mon, 22 Oct 2018 06:04:13 +0000
> > Yogesh Narayan Gaur <yogeshnarayan.gaur@xxxxxxx> wrote:
> >
> >
> With below patch, it gets stuck in for loop of "+ for (nmaps = 0; i< smpt_len; nmaps++) {".
>
> [ 1.624684] m25p80 spi0.0: found s25fl512s, expected m25p80
> [ 1.630377] Start [addr_width:00000000, read_dumy:08, read_opcode:00000000]
> [ 1.637335] spi_nor_get_map_in_use:2882 smpt[0]=08ff65fc
> [ 1.642641] spi_nor_get_map_in_use:2882 smpt[1]=00000004
> [ 1.647945] spi_nor_get_map_in_use:2882 smpt[2]=04ff65fc
> [ 1.653248] spi_nor_get_map_in_use:2882 smpt[3]=00000002
> [ 1.658551] spi_nor_get_map_in_use:2882 smpt[4]=02ff65fd
> [ 1.663855] spi_nor_get_map_in_use:2882 smpt[5]=00000004
> [ 1.669158] spi_nor_get_map_in_use:2882 smpt[6]=ff0201fe
> [ 1.674461] spi_nor_get_map_in_use:2882 smpt[7]=00007ff1
> [ 1.679766] spi_nor_get_map_in_use:2882 smpt[8]=00037ff4
> [ 1.685070] spi_nor_get_map_in_use:2882 smpt[9]=03fbfff4
> [ 1.690375] spi_nor_get_map_in_use:2882 smpt[10]=ff0203fe
> [ 1.695768] spi_nor_get_map_in_use:2882 smpt[11]=03fbfff4
> [ 1.701158] spi_nor_get_map_in_use:2882 smpt[12]=00037ff4
> [ 1.706550] spi_nor_get_map_in_use:2882 smpt[13]=00007ff1
> [ 1.711940] spi_nor_get_map_in_use:2882 smpt[14]=ff0005ff
> [ 1.717330] spi_nor_get_map_in_use:2882 smpt[15]=03fffff4
> [ 1.722720] smpt[0]=[addr_width:00000000, read_dumy:08, read_opcode:00000065]
> [ 1.729861] spi_nor_get_map_in_use:2912 map_id=1
>
>
> --- 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++) {
> + 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;
> }
>
> - /* 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;
Try to Replace the above if block by:
if (!(smpt[i] & SMPT_DESC_TYPE_MAP)) {
i += 2;
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;