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

[Yogesh Narayan Gaur <yogeshnarayan.gaur@xxxxxxx>]

HI,


> -----Original Message-----
> From: Boris Brezillon [mailto:boris.brezillon@xxxxxxxxxxx]
> Sent: Monday, October 22, 2018 1:32 PM
> To: Yogesh Narayan Gaur <yogeshnarayan.gaur@xxxxxxx>
> Cc: Cyrille Pitchen <cyrille.pitchen@xxxxxxxxxx>; Tudor Ambarus
> <tudor.ambarus@xxxxxxxxxxxxx>; marek.vasut@xxxxxxxxx;
> dwmw2@xxxxxxxxxxxxx; computersforpeace@xxxxxxxxx; richard@xxxxxx;
> linux-kernel@xxxxxxxxxxxxxxx; nicolas.ferre@xxxxxxxxxxxxx;
> cyrille.pitchen@xxxxxxxxxxxxx; linux-mtd@xxxxxxxxxxxxxxxxxxx; linux-arm-
> kernel@xxxxxxxxxxxxxxxxxxx; Cristian.Birsan@xxxxxxxxxxxxx; Mark Brown
> <broonie@xxxxxxxxxx>
> 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:
> 
> > -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;
> >
> > +       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]);
> 
> Could you also print the ->addr_width, ->read_dummy and ->read_opcode here?
> 
It didn't showing any print messages here, did above line "         if (!(smpt[i] & SMPT_DESC_TYPE_MAP))" also needs to be changes to "    if ((smpt[i] & SMPT_DESC_TYPE_MAP))"?

Below is the log, with the suggested change of modifying as
> +       for (nmaps = 0; nmaps< smpt_len; nmaps++) {
> +               if((smpt[nmaps] & SMPT_DESC_TYPE_MAP))

[    1.625992] m25p80 spi0.0: found s25fl512s, expected m25p80                                                                   
[    1.631681] spi_nor_get_map_in_use:2880 smpt[0]=08ff65fc                                                                      
[    1.636988] spi_nor_get_map_in_use:2880 smpt[1]=00000004                                                                      
[    1.642292] spi_nor_get_map_in_use:2880 smpt[2]=04ff65fc                                                                      
[    1.647596] spi_nor_get_map_in_use:2880 smpt[3]=00000002                                                                      
[    1.652898] spi_nor_get_map_in_use:2880 smpt[4]=02ff65fd                                                                      
[    1.658200] spi_nor_get_map_in_use:2880 smpt[5]=00000004                                                                      
[    1.663503] spi_nor_get_map_in_use:2880 smpt[6]=ff0201fe                                                                      
[    1.668806] spi_nor_get_map_in_use:2880 smpt[7]=00007ff1                                                                      
[    1.674108] spi_nor_get_map_in_use:2880 smpt[8]=00037ff4                                                                      
[    1.679412] spi_nor_get_map_in_use:2880 smpt[9]=03fbfff4                                                                      
[    1.684715] spi_nor_get_map_in_use:2880 smpt[10]=ff0203fe                                                                     
[    1.690105] spi_nor_get_map_in_use:2880 smpt[11]=03fbfff4                                                                     
[    1.695495] spi_nor_get_map_in_use:2880 smpt[12]=00037ff4                                                                     
[    1.700886] spi_nor_get_map_in_use:2880 smpt[13]=00007ff1                                                                     
[    1.706275] spi_nor_get_map_in_use:2880 smpt[14]=ff0005ff                                                                     
[    1.711664] spi_nor_get_map_in_use:2880 smpt[15]=03fffff4                                                                     
[    1.717053] spi_nor_get_map_in_use:2910 NO map_id                                                                             
[    1.721777] m25p80 spi0.0: s25fl512s (65536 Kbytes)                

Didn't throw any return error.

--
Regards,
Yogesh Gaur


> > @@ -2894,18 +2900,35 @@ 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;
> >         }


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