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Date: Mon, 22 Oct 2018 09:34:15 +0200
From: Boris Brezillon <boris.brezillon@...tlin.com>
To: Yogesh Narayan Gaur <yogeshnarayan.gaur@....com>
Cc: Cyrille Pitchen <cyrille.pitchen@...ev4u.fr>,
Tudor Ambarus <tudor.ambarus@...rochip.com>,
"marek.vasut@...il.com" <marek.vasut@...il.com>,
"dwmw2@...radead.org" <dwmw2@...radead.org>,
"computersforpeace@...il.com" <computersforpeace@...il.com>,
"richard@....at" <richard@....at>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"nicolas.ferre@...rochip.com" <nicolas.ferre@...rochip.com>,
"cyrille.pitchen@...rochip.com" <cyrille.pitchen@...rochip.com>,
"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
"linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"Cristian.Birsan@...rochip.com" <Cristian.Birsan@...rochip.com>,
Mark Brown <broonie@...nel.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 06:04:13 +0000
Yogesh Narayan Gaur <yogeshnarayan.gaur@....com> wrote:
> Hi Boris, Tudor,
>
> > -----Original Message-----
> > From: Boris Brezillon [mailto:boris.brezillon@...tlin.com]
> > Sent: Wednesday, October 17, 2018 3:23 PM
> > To: Yogesh Narayan Gaur <yogeshnarayan.gaur@....com>
> > Cc: Cyrille Pitchen <cyrille.pitchen@...ev4u.fr>; Tudor Ambarus
> > <tudor.ambarus@...rochip.com>; marek.vasut@...il.com;
> > dwmw2@...radead.org; computersforpeace@...il.com; richard@....at;
> > linux-kernel@...r.kernel.org; nicolas.ferre@...rochip.com;
> > cyrille.pitchen@...rochip.com; linux-mtd@...ts.infradead.org; linux-arm-
> > kernel@...ts.infradead.org; Cristian.Birsan@...rochip.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@....com> wrote:
> >
> > > Hi Boris,
> > >
> > > > -----Original Message-----
> > > > From: Boris Brezillon [mailto:boris.brezillon@...tlin.com]
> > > > Sent: Wednesday, October 17, 2018 1:00 PM
> > > > To: Yogesh Narayan Gaur <yogeshnarayan.gaur@....com>
> > > > Cc: Cyrille Pitchen <cyrille.pitchen@...ev4u.fr>; Tudor Ambarus
> > > > <tudor.ambarus@...rochip.com>; marek.vasut@...il.com;
> > > > dwmw2@...radead.org; computersforpeace@...il.com; richard@....at;
> > > > linux-kernel@...r.kernel.org; nicolas.ferre@...rochip.com;
> > > > cyrille.pitchen@...rochip.com; linux-mtd@...ts.infradead.org;
> > > > linux-arm- kernel@...ts.infradead.org; Cristian.Birsan@...rochip.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@...tlin.com> wrote:
> > > >
> > > > > On Wed, 17 Oct 2018 09:07:24 +0200 Boris Brezillon
> > > > > <boris.brezillon@...tlin.com> wrote:
> > > > >
> > > > > > On Wed, 17 Oct 2018 02:07:43 +0000 Yogesh Narayan Gaur
> > > > > > <yogeshnarayan.gaur@....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
> [...]
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