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 4:23 PM
> To: Yogesh Narayan Gaur <yogeshnarayan.gaur@xxxxxxx>;
> Cristian.Birsan@xxxxxxxxxxxxx
> 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; 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 12:46:27 +0200
> Boris Brezillon <boris.brezillon@xxxxxxxxxxx> wrote:
> 
> > On Mon, 22 Oct 2018 10:39:48 +0000
> > Yogesh Narayan Gaur <yogeshnarayan.gaur@xxxxxxx> wrote:
> >
> > >
> > > [    1.632190] Start [addr_width:00000000, read_dumy:08,
> read_opcode:00000000]
> > > [    1.639148] spi_nor_get_map_in_use:2882 smpt[0]=08ff65fc
> > > [    1.644451] spi_nor_get_map_in_use:2882 smpt[1]=00000004
> > > [    1.649755] spi_nor_get_map_in_use:2882 smpt[2]=04ff65fc
> > > [    1.655057] spi_nor_get_map_in_use:2882 smpt[3]=00000002
> > > [    1.660360] spi_nor_get_map_in_use:2882 smpt[4]=02ff65fd
> > > [    1.665662] spi_nor_get_map_in_use:2882 smpt[5]=00000004
> > > [    1.670965] spi_nor_get_map_in_use:2882 smpt[6]=ff0201fe
> > > [    1.676267] spi_nor_get_map_in_use:2882 smpt[7]=00007ff1
> > > [    1.681571] spi_nor_get_map_in_use:2882 smpt[8]=00037ff4
> > > [    1.686874] spi_nor_get_map_in_use:2882 smpt[9]=03fbfff4
> > > [    1.692176] spi_nor_get_map_in_use:2882 smpt[10]=ff0203fe
> > > [    1.697566] spi_nor_get_map_in_use:2882 smpt[11]=03fbfff4
> > > [    1.702954] spi_nor_get_map_in_use:2882 smpt[12]=00037ff4
> > > [    1.708343] spi_nor_get_map_in_use:2882 smpt[13]=00007ff1
> > > [    1.713732] spi_nor_get_map_in_use:2882 smpt[14]=ff0005ff
> > > [    1.719120] spi_nor_get_map_in_use:2882 smpt[15]=03fffff4
> > > [    1.724509] smpt[0]=[addr_width:00000000, read_dumy:08,
> read_opcode:00000065]
> > > [    1.731650] smpt[1]=[addr_width:00000000, read_dumy:08,
> read_opcode:00000000]
> > > [    1.738791] smpt[2]=[addr_width:00000000, read_dumy:08,
> read_opcode:00000065]
> >
> > You still don't print read_dummy correctly: %0x8 -> %08x.
> >
> > Can you add
> >
> > 	if (!nor->addr_width)
> > 		nor->addr_width = 3;
> >
> > After the
> >
> > 	nor->addr_width = spi_nor_smpt_addr_width(nor, smpt[i]);
> >
> > line.
> 
> And you should also try to force ->read_dummy to 8, because according to the
> spec, the default read_latency is 8 for this chip. With that in place, you should
> get an map_id of 1, 3 or 5.
> 

Below is the log output.
I have forced the read_dummy as 8 and addr_width is programmed as 3.

[    1.625176] m25p80 spi0.0: found s25fl512s, expected m25p80                                                                   
[    1.630875] Start [addr_width:00000000, read_dumy:00000000, read_opcode:00000000]                                             
[    1.638352] spi_nor_get_map_in_use:2882 smpt[0]=08ff65fc                                                                      
[    1.643658] spi_nor_get_map_in_use:2882 smpt[1]=00000004                                                                      
[    1.648963] spi_nor_get_map_in_use:2882 smpt[2]=04ff65fc                                                                      
[    1.654266] spi_nor_get_map_in_use:2882 smpt[3]=00000002                                                                      
[    1.659569] spi_nor_get_map_in_use:2882 smpt[4]=02ff65fd                                                                      
[    1.664872] spi_nor_get_map_in_use:2882 smpt[5]=00000004                                                                      
[    1.670175] spi_nor_get_map_in_use:2882 smpt[6]=ff0201fe                                                                      
[    1.675477] spi_nor_get_map_in_use:2882 smpt[7]=00007ff1                                                                      
[    1.680782] spi_nor_get_map_in_use:2882 smpt[8]=00037ff4                                                                      
[    1.686084] spi_nor_get_map_in_use:2882 smpt[9]=03fbfff4                                                                      
[    1.691391] spi_nor_get_map_in_use:2882 smpt[10]=ff0203fe                                                                     
[    1.696782] spi_nor_get_map_in_use:2882 smpt[11]=03fbfff4                                                                     
[    1.702171] spi_nor_get_map_in_use:2882 smpt[12]=00037ff4                                                                     
[    1.707561] spi_nor_get_map_in_use:2882 smpt[13]=00007ff1                                                                     
[    1.712951] spi_nor_get_map_in_use:2882 smpt[14]=ff0005ff                                                                     
[    1.718340] spi_nor_get_map_in_use:2882 smpt[15]=03fffff4                                                                     
[    1.723731] smpt[0]=[addr_width:00000003, read_dumy:00000008, read_opcode:00000065]                                           
[    1.731393] smpt[1]=[addr_width:00000003, read_dumy:00000008, read_opcode:00000000]                                           
[    1.739056] smpt[2]=[addr_width:00000003, read_dumy:00000008, read_opcode:00000065]                                           
[    1.746721] spi_nor_get_map_in_use:2914 map_id=0 smpt_len:16 i=:3                                                             
[    1.752807] End [addr_width:00000003, read_dumy:00000008, read_opcode:00000065]                                               
[    1.760125] m25p80 spi0.0: s25fl512s (65536 Kbytes)  

                read_data_mask = SMPT_CMD_READ_DATA(smpt[i]);
                nor->addr_width = spi_nor_smpt_addr_width(nor, smpt[i]);
                if (!nor->addr_width)
                        nor->addr_width = 3;

                nor->read_dummy = 8; 
                nor->read_opcode = SMPT_CMD_OPCODE(smpt[i]);
                pr_info("smpt[%d]=[addr_width:%08x, read_dumy:%08x, 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);
                if (err)
                        goto out;

--
Regards
Yogesh Gaur.

> >
> > > [    1.745932] spi_nor_get_map_in_use:2911 map_id=0 smpt_len:16 i=:3
> > > [    1.752018] End [addr_width:00000000, read_dumy:08,
> read_opcode:00000065]
> > >
> > > Also, one more thing when we are returning from the function, we are over-
> writing the values of addr_widthm read_dummy and read_opcode.
> > > Is this correct?
> >
> > Yes, that's correct.
> >
> > >
> > > out:
> > >         nor->addr_width = addr_width;
> > >         nor->read_dummy = read_dummy;
> > >         nor->read_opcode = read_opcode;
> > >         return ret;
> > > }
> > >
> >
> >


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