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

[Boris Brezillon <boris.brezillon@bootlin.com>]

On Mon, 22 Oct 2018 11:03:09 +0000
Yogesh Narayan Gaur <yogeshnarayan.gaur@nxp.com> wrote:

> Hi,
> 
> > -----Original Message-----
> > From: Boris Brezillon [mailto:boris.brezillon@bootlin.com]
> > Sent: Monday, October 22, 2018 4:23 PM
> > To: Yogesh Narayan Gaur <yogeshnarayan.gaur@nxp.com>;
> > Cristian.Birsan@microchip.com
> > Cc: Tudor Ambarus <tudor.ambarus@microchip.com>; richard@nod.at; Mark
> > Brown <broonie@kernel.org>; linux-kernel@vger.kernel.org;
> > nicolas.ferre@microchip.com; marek.vasut@gmail.com;
> > cyrille.pitchen@microchip.com; linux-mtd@lists.infradead.org; Cyrille Pitchen
> > <cyrille.pitchen@wedev4u.fr>; computersforpeace@gmail.com;
> > dwmw2@infradead.org; linux-arm-kernel@lists.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 12:46:27 +0200
> > Boris Brezillon <boris.brezillon@bootlin.com> wrote:
> >   
> > > On Mon, 22 Oct 2018 10:39:48 +0000
> > > Yogesh Narayan Gaur <yogeshnarayan.gaur@nxp.com> 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]

You still have a problem with the for() loop increment. i should be 2
here, not 1. Did you change the i++ by i += 2?
 
> [    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);

Can you print addr and data_byte here?