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Date:   Mon, 22 Oct 2018 09:34:15 +0200
From:   Boris Brezillon <boris.brezillon@bootlin.com>
To:     Yogesh Narayan Gaur <yogeshnarayan.gaur@nxp.com>
Cc:     Cyrille Pitchen <cyrille.pitchen@wedev4u.fr>,
        Tudor Ambarus <tudor.ambarus@microchip.com>,
        "marek.vasut@gmail.com" <marek.vasut@gmail.com>,
        "dwmw2@infradead.org" <dwmw2@infradead.org>,
        "computersforpeace@gmail.com" <computersforpeace@gmail.com>,
        "richard@nod.at" <richard@nod.at>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "nicolas.ferre@microchip.com" <nicolas.ferre@microchip.com>,
        "cyrille.pitchen@microchip.com" <cyrille.pitchen@microchip.com>,
        "linux-mtd@lists.infradead.org" <linux-mtd@lists.infradead.org>,
        "linux-arm-kernel@lists.infradead.org" 
        <linux-arm-kernel@lists.infradead.org>,
        "Cristian.Birsan@microchip.com" <Cristian.Birsan@microchip.com>,
        Mark Brown <broonie@kernel.org>
Subject: Re: [PATCH v3 1/2] mtd: spi-nor: add support to non-uniform SFDP
 SPI NOR flash memories
Message-ID: <20181022093415.131b75bc@bbrezillon>
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On Mon, 22 Oct 2018 06:04:13 +0000
Yogesh Narayan Gaur <yogeshnarayan.gaur@nxp.com> wrote:

> Hi Boris, Tudor,
> 
> > -----Original Message-----
> > From: Boris Brezillon [mailto:boris.brezillon@bootlin.com]
> > Sent: Wednesday, October 17, 2018 3:23 PM
> > To: Yogesh Narayan Gaur <yogeshnarayan.gaur@nxp.com>
> > Cc: Cyrille Pitchen <cyrille.pitchen@wedev4u.fr>; Tudor Ambarus
> > <tudor.ambarus@microchip.com>; marek.vasut@gmail.com;
> > dwmw2@infradead.org; computersforpeace@gmail.com; richard@nod.at;
> > linux-kernel@vger.kernel.org; nicolas.ferre@microchip.com;
> > cyrille.pitchen@microchip.com; linux-mtd@lists.infradead.org; linux-arm-
> > kernel@lists.infradead.org; Cristian.Birsan@microchip.com
> > Subject: Re: [PATCH v3 1/2] mtd: spi-nor: add support to non-uniform SFDP SPI
> > NOR flash memories
> > 
> > On Wed, 17 Oct 2018 07:46:30 +0000
> > Yogesh Narayan Gaur <yogeshnarayan.gaur@nxp.com> wrote:
> >   
> > > Hi Boris,
> > >  
> > > > -----Original Message-----
> > > > From: Boris Brezillon [mailto:boris.brezillon@bootlin.com]
> > > > Sent: Wednesday, October 17, 2018 1:00 PM
> > > > To: Yogesh Narayan Gaur <yogeshnarayan.gaur@nxp.com>
> > > > Cc: Cyrille Pitchen <cyrille.pitchen@wedev4u.fr>; Tudor Ambarus
> > > > <tudor.ambarus@microchip.com>; marek.vasut@gmail.com;
> > > > dwmw2@infradead.org; computersforpeace@gmail.com; richard@nod.at;
> > > > linux-kernel@vger.kernel.org; nicolas.ferre@microchip.com;
> > > > cyrille.pitchen@microchip.com; linux-mtd@lists.infradead.org;
> > > > linux-arm- kernel@lists.infradead.org; Cristian.Birsan@microchip.com
> > > > Subject: Re: [PATCH v3 1/2] mtd: spi-nor: add support to non-uniform
> > > > SFDP SPI NOR flash memories
> > > >
> > > > On Wed, 17 Oct 2018 09:10:45 +0200
> > > > Boris Brezillon <boris.brezillon@bootlin.com> wrote:
> > > >  
> > > > > On Wed, 17 Oct 2018 09:07:24 +0200 Boris Brezillon
> > > > > <boris.brezillon@bootlin.com> wrote:
> > > > >  
> > > > > > On Wed, 17 Oct 2018 02:07:43 +0000 Yogesh Narayan Gaur
> > > > > > <yogeshnarayan.gaur@nxp.com> wrote:
> > > > > >  
> > > > > > > >  
> > > > > > > Actually there is no entry of s25fs512s in current spi-nor.c file.
> > > > > > > For my connected flash part, jedec ID read points to
> > > > > > > s25fl512s. I have asked my board team to confirm the name of
> > > > > > > exact connected flash part. When I check the data sheet of
> > > > > > > s25fs512s, it also points to the same Jedec ID information. {
> > > > > > > "s25fl512s", INFO(0x010220, 0x4d00, 256
> > > > > > > * 1024, 256, ....}
> > > > > > >
> > > > > > > But as stated earlier, if I skip reading SFDP or read using
> > > > > > > 1-1-1 protocol then read are always correct. For 1-4-4
> > > > > > > protocol read are wrong and on further debugging found that
> > > > > > > Read code of 0x6C is being send as opcode instead of 0xEC.
> > > > > > >
> > > > > > > If I revert this patch, reads are working fine.  
> > > > > >
> > > > > > Can you try with the following patch?
> > > > > >  
> > > > >
> > > > > Hm, nevermind. The problem is actually not related to 4B vs non-4B
> > > > > mode but 1-1-4 vs 1-4-4 modes.  
> > > Yes, that's only I have stated in my first mail that instead of 1-4-4 mode read  
> > opcode is being sent for 1-1-4 mode.  
> > > > >  
> > > >
> > > > Can you try with this patch applied?
> > > >  
> > > With suggested patch, read for protocol 1-4-4 working correctly.
> > >
> > > 	[    1.625360] m25p80 spi0.0: found s25fl512s, expected m25p80
> > > 	[    1.631094] m25p80 spi0.0: failed to parse SMPT (err = -22)
> > > 	[    1.636661] 261 8c4c780 opcode(read:eb, pp:2, erase:d8)
> > > 	[    1.641878] 266 8c4c780 opcode(read:ec, pp:12, erase:dc)
> > > 	[    1.647200] m25p80 spi0.0: s25fl512s (65536 Kbytes)
> > >  
> > 
> > Okay, let's try this one to see why the SMPT parsing fails.
> >   
> 
> Please find the below info for the SMPT table read from the flash
> [    1.631085] spi_nor_get_map_in_use:2880 smpt[0]=08ff65fc   
> [    1.636393] spi_nor_get_map_in_use:2880 smpt[1]=00000004   
> [    1.641696] spi_nor_get_map_in_use:2880 smpt[2]=04ff65fc   
> [    1.646998] spi_nor_get_map_in_use:2880 smpt[3]=00000002   
> [    1.652302] spi_nor_get_map_in_use:2880 smpt[4]=02ff65fd   
> [    1.657606] spi_nor_get_map_in_use:2880 smpt[5]=00000004   
> [    1.662911] spi_nor_get_map_in_use:2880 smpt[6]=ff0201fe   
> [    1.668215] spi_nor_get_map_in_use:2880 smpt[7]=00007ff1   
> [    1.673520] spi_nor_get_map_in_use:2880 smpt[8]=00037ff4   
> [    1.678825] spi_nor_get_map_in_use:2880 smpt[9]=03fbfff4   
> [    1.684128] spi_nor_get_map_in_use:2880 smpt[10]=ff0203fe   
> [    1.689519] spi_nor_get_map_in_use:2880 smpt[11]=03fbfff4   
> [    1.694911] spi_nor_get_map_in_use:2880 smpt[12]=00037ff4   
> [    1.700303] spi_nor_get_map_in_use:2880 smpt[13]=00007ff1   
> [    1.705693] spi_nor_get_map_in_use:2880 smpt[14]=ff0005ff   
> [    1.711081] spi_nor_get_map_in_use:2880 smpt[15]=03fffff4   
> [    1.716470] spi_nor_get_map_in_use:2910 NO map_id           
> [    1.721165] spi_nor_parse_smpt:3055                         
> [    1.724645] m25p80 spi0.0: failed to parse SMPT (err = -22)
> 
> I have checked that all these information are matching with the fields specified in this flash data sheet [1], page 131-133.
> 
> Below is the full debug patch.
> 
> --- a/drivers/mtd/spi-nor/spi-nor.c
> +++ b/drivers/mtd/spi-nor/spi-nor.c
> @@ -2863,22 +2863,28 @@ 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;
> 
> +       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]);
> @@ -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;
>         }
> 
> -       /* 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; nmaps< smpt_len; nmaps++) {
> +               if(!(smpt[nmaps] & SMPT_DESC_TYPE_MAP))

My bad, this should be

		if(smpt[nmaps] & SMPT_DESC_TYPE_MAP)

Can you try again with this change?

> +                       continue;
> +
> +               if(!map_id_is_valid) {
> +                       if (nmaps) {
> +                               ret = NULL;
> +                               break;
> +                       }
> +
> +                       ret = smpt+nmaps;
> +               } else if (map_id == SMPT_MAP_ID(smpt[nmaps])) {
> +                       ret = smpt+nmaps;
> +                       break;
> +               }
> +
>                 /* increment the table index to the next map */
> -               i += SMPT_MAP_REGION_COUNT(smpt[i]) + 1;
> +               nmaps += SMPT_MAP_REGION_COUNT(smpt[nmaps]) + 1;
>         }
> 
> -       ret = smpt + i;
>         /* fall through */
>  out:
>         nor->addr_width = addr_width;
> @@ -3027,8 +3050,9 @@ static int spi_nor_parse_smpt(struct spi_nor *nor,
>         for (i = 0; i < smpt_header->length; i++)
>                 smpt[i] = le32_to_cpu(smpt[i]);
> 
> -       sector_map = spi_nor_get_map_in_use(nor, smpt);
> +       sector_map = spi_nor_get_map_in_use(nor, smpt, smpt_header->length);
>         if (!sector_map) {
> +               pr_info("%s:%i\n", __func__, __LINE__);
>                 ret = -EINVAL;
>                 goto out;
>         }
> @@ -3139,6 +3167,17 @@ static int spi_nor_parse_sfdp(struct spi_nor *nor,
>                 switch (SFDP_PARAM_HEADER_ID(param_header)) {
>                 case SFDP_SECTOR_MAP_ID:
>                         err = spi_nor_parse_smpt(nor, param_header);
> +                       if (err) {
> +                               dev_warn(dev,
> +                               "failed to parse SMPT (err = %d)\n",
> +                               err);
> +                               /*
> +                                * SMPT parsing is optional, let's not drop
> +                                * all information we extracted so far just
> +                                * because it failed.
> +                                */
> +                               err = 0;
> +                       }
>                         break;
> 
>                 default:
> [1] http://www.cypress.com/documentation/datasheets/s25fs512s-512-mbit-18-v-serial-peripheral-interface-multi-io-non-volatile
> 
> --
> Regards
> Yogesh Gaur
> [...]