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Date:   Tue, 23 Oct 2018 07:39:46 +0200
From:   Boris Brezillon <boris.brezillon@...tlin.com>
To:     Yogesh Narayan Gaur <yogeshnarayan.gaur@....com>
Cc:     "Cristian.Birsan@...rochip.com" <Cristian.Birsan@...rochip.com>,
        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>,
        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 Tue, 23 Oct 2018 04:47:33 +0000
Yogesh Narayan Gaur <yogeshnarayan.gaur@....com> wrote:

> Hi,
> 
> > -----Original Message-----
> > From: Boris Brezillon [mailto:boris.brezillon@...tlin.com]
> > Sent: Monday, October 22, 2018 5:22 PM
> > To: Yogesh Narayan Gaur <yogeshnarayan.gaur@....com>
> > Cc: Cristian.Birsan@...rochip.com; Tudor Ambarus
> > <tudor.ambarus@...rochip.com>; richard@....at; Mark Brown
> > <broonie@...nel.org>; linux-kernel@...r.kernel.org;
> > nicolas.ferre@...rochip.com; marek.vasut@...il.com;
> > cyrille.pitchen@...rochip.com; linux-mtd@...ts.infradead.org; Cyrille Pitchen
> > <cyrille.pitchen@...ev4u.fr>; computersforpeace@...il.com;
> > dwmw2@...radead.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 11:46:55 +0000
> > Yogesh Narayan Gaur <yogeshnarayan.gaur@....com> wrote:
> >   
> > > Hi,
> > >  
> > > > -----Original Message-----
> > > > From: Boris Brezillon [mailto:boris.brezillon@...tlin.com]
> > > > Sent: Monday, October 22, 2018 5:13 PM
> > > > To: Yogesh Narayan Gaur <yogeshnarayan.gaur@....com>
> > > > Cc: Cristian.Birsan@...rochip.com; Tudor Ambarus
> > > > <tudor.ambarus@...rochip.com>; richard@....at; Mark Brown
> > > > <broonie@...nel.org>; linux-kernel@...r.kernel.org;
> > > > nicolas.ferre@...rochip.com; marek.vasut@...il.com;
> > > > cyrille.pitchen@...rochip.com; linux-mtd@...ts.infradead.org;
> > > > Cyrille Pitchen <cyrille.pitchen@...ev4u.fr>;
> > > > computersforpeace@...il.com; dwmw2@...radead.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 11:03:09 +0000
> > > > Yogesh Narayan Gaur <yogeshnarayan.gaur@....com> wrote:
> > > >  
> > > > > Hi,
> > > > >  
> > > > > > -----Original Message-----
> > > > > > From: Boris Brezillon [mailto:boris.brezillon@...tlin.com]
> > > > > > Sent: Monday, October 22, 2018 4:23 PM
> > > > > > To: Yogesh Narayan Gaur <yogeshnarayan.gaur@....com>;
> > > > > > Cristian.Birsan@...rochip.com
> > > > > > Cc: Tudor Ambarus <tudor.ambarus@...rochip.com>; richard@....at;
> > > > > > Mark Brown <broonie@...nel.org>; linux-kernel@...r.kernel.org;
> > > > > > nicolas.ferre@...rochip.com; marek.vasut@...il.com;
> > > > > > cyrille.pitchen@...rochip.com; linux-mtd@...ts.infradead.org;
> > > > > > Cyrille Pitchen <cyrille.pitchen@...ev4u.fr>;
> > > > > > computersforpeace@...il.com; dwmw2@...radead.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 12:46:27 +0200 Boris Brezillon
> > > > > > <boris.brezillon@...tlin.com> wrote:
> > > > > >  
> > > > > > > On Mon, 22 Oct 2018 10:39:48 +0000 Yogesh Narayan Gaur
> > > > > > > <yogeshnarayan.gaur@....com> wrote:
> > > > > > >  
> > > Patch used
> > >
> > > --- a/drivers/mtd/spi-nor/spi-nor.c
> > > +++ b/drivers/mtd/spi-nor/spi-nor.c
> > > @@ -2863,26 +2863,39 @@ static u8 spi_nor_smpt_read_dummy(const struct
> > > spi_nor *nor, const u32 settings)  
> >   
> > >         /* Determine if there are any optional Detection Command Descriptors */
> > > -       while (!(smpt[i] & SMPT_DESC_TYPE_MAP)) {
> > > +       for (i = 0; i< smpt_len; i++) {  
> > 
> > See, you should have i += 2 here, not i++.  
> 
> Ok
> >   
> > > +               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]);
> > > +               if (!nor->addr_width)
> > > +                       nor->addr_width = 3;
> > > +
> > > +               nor->read_dummy = 8; //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:%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);  
> > 
> > And add a trace here to print data_byte and addr.
> >   
> Logs:
> [    1.625840] m25p80 spi0.0: found s25fl512s, expected m25p80                                                                   
> [    1.631536] Start [addr_width:00000000, read_dumy:00000000, read_opcode:00000000]                                             
> [    1.639013] spi_nor_get_map_in_use:2882 smpt[0]=08ff65fc                                                                      
> [    1.644317] spi_nor_get_map_in_use:2882 smpt[1]=00000004                                                                      
> [    1.649621] spi_nor_get_map_in_use:2882 smpt[2]=04ff65fc                                                                      
> [    1.654924] spi_nor_get_map_in_use:2882 smpt[3]=00000002                                                                      
> [    1.660229] spi_nor_get_map_in_use:2882 smpt[4]=02ff65fd                                                                      
> [    1.665532] spi_nor_get_map_in_use:2882 smpt[5]=00000004                                                                      
> [    1.670836] spi_nor_get_map_in_use:2882 smpt[6]=ff0201fe                                                                      
> [    1.676140] spi_nor_get_map_in_use:2882 smpt[7]=00007ff1                                                                      
> [    1.681444] spi_nor_get_map_in_use:2882 smpt[8]=00037ff4                                                                      
> [    1.686748] spi_nor_get_map_in_use:2882 smpt[9]=03fbfff4                                                                      
> [    1.692052] spi_nor_get_map_in_use:2882 smpt[10]=ff0203fe                                                                     
> [    1.697441] spi_nor_get_map_in_use:2882 smpt[11]=03fbfff4                                                                     
> [    1.702830] spi_nor_get_map_in_use:2882 smpt[12]=00037ff4                                                                     
> [    1.708220] spi_nor_get_map_in_use:2882 smpt[13]=00007ff1                                                                     
> [    1.713608] spi_nor_get_map_in_use:2882 smpt[14]=ff0005ff                                                                     
> [    1.718999] spi_nor_get_map_in_use:2882 smpt[15]=03fffff4                                                                     
> [    1.724388] smpt[0]=[addr_width:00000003, read_dumy:00000008, read_opcode:00000065]                                           
> [    1.732050] smpt_read[1] addr[00000004], data_byte[00000000] err:00000000                                                     
> [    1.738830] smpt[2]=[addr_width:00000003, read_dumy:00000008, read_opcode:00000065]                                           
> [    1.746491] smpt_read[3] addr[00000002], data_byte[00000002] err:00000000                                                     
> [    1.753270] smpt[4]=[addr_width:00000003, read_dumy:00000008, read_opcode:00000065]                                           
> [    1.760930] smpt_read[5] addr[00000004], data_byte[00000000] err:00000000  

Ok, so now the opcode and address are matching the values in the spec.
Can you check what's sent to the SPI controller side (in your
->exec_op() implementation), just to make sure the m25p80 propagates
the information correctly? When you do that, make sure you also print
the buswidth of each element (op->cmd.buswidth, op->addr.buswidth,
op->dummy.buswidth and op->data.buswidth).

Can you also print the read_data_mask value here.

Next thing you can do is read the CR2NV reg (using the RDAR command) and
check the RL (Read Latency) and AL (Address Length) values.

> [    1.767710] spi_nor_get_map_in_use:2915 map_id=0 smpt_len:16 i=:6                                                             
> [    1.773794] End [addr_width:00000003, read_dumy:00000008, read_opcode:00000065] ReturnVal:00000000                                
> [    1.781092] spi_nor_parse_smpt:3065                                                                                           
> [    1.784573] m25p80 spi0.0: failed to parse SMPT (err = -22)                                                                   
> [    1.790153] m25p80 spi0.0: s25fl512s (65536 Kbytes)  
> 
> 
> Code:
>         for (i = 0; i< smpt_len; 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]);
>                 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);
>                 pr_info("smpt_read[%d] addr[%08x], data_byte[%08x] err:%08x\n", (i+1), addr, data_byte, err);
>                 if (err)
>                         goto out;
> 
>                 /*
>                  * Build an index value that is used to select the Sector Map
>                  * Configuration that is currently in use.
>                  */
>                 map_id = map_id << 1 | !!(data_byte & read_data_mask);
>                 map_id_is_valid = true;
>         }
> 
>         if (map_id_is_valid)
>                 pr_info("%s:%i map_id=%d smpt_len:%d i=:%d\n", __func__, __LINE__, map_id, smpt_len, i);
>         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)) {
>                         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;
>         }
> 
>         pr_info("End [addr_width:%08x, read_dumy:%08x, read_opcode:%08x] ReturnVal:%08x\n", nor->addr_width, nor->read_dummy, nor->read_opcode, ret);
> 
> --
> Thanks
> Yogesh Gaur.
> 
> > Thanks,
> > 
> > Boris  

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