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From:   Yogesh Narayan Gaur <yogeshnarayan.gaur@nxp.com>
To:     Boris Brezillon <boris.brezillon@bootlin.com>
CC:     "Cristian.Birsan@microchip.com" <Cristian.Birsan@microchip.com>,
        Tudor Ambarus <tudor.ambarus@microchip.com>,
        "richard@nod.at" <richard@nod.at>, Mark Brown <broonie@kernel.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "nicolas.ferre@microchip.com" <nicolas.ferre@microchip.com>,
        "marek.vasut@gmail.com" <marek.vasut@gmail.com>,
        "cyrille.pitchen@microchip.com" <cyrille.pitchen@microchip.com>,
        "linux-mtd@lists.infradead.org" <linux-mtd@lists.infradead.org>,
        Cyrille Pitchen <cyrille.pitchen@wedev4u.fr>,
        "computersforpeace@gmail.com" <computersforpeace@gmail.com>,
        "dwmw2@infradead.org" <dwmw2@infradead.org>,
        "linux-arm-kernel@lists.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
Thread-Topic: [PATCH v3 1/2] mtd: spi-nor: add support to non-uniform SFDP SPI
 NOR flash memories
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Date:   Tue, 23 Oct 2018 09:15:43 +0000
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Hi,

> -----Original Message-----
> From: Boris Brezillon [mailto:boris.brezillon@bootlin.com]
> Sent: Tuesday, October 23, 2018 2:40 PM
> To: Yogesh Narayan Gaur <yogeshnarayan.gaur@nxp.com>
> Cc: Cristian.Birsan@microchip.com; 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 Pit=
chen
> <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
>=20
> On Tue, 23 Oct 2018 09:05:23 +0000
> Yogesh Narayan Gaur <yogeshnarayan.gaur@nxp.com> wrote:
>=20
> > Hi,
> >
> > > -----Original Message-----
> > > From: Boris Brezillon [mailto:boris.brezillon@bootlin.com]
> > > Sent: Tuesday, October 23, 2018 2:31 PM
> > > To: Yogesh Narayan Gaur <yogeshnarayan.gaur@nxp.com>
> > > Cc: Cristian.Birsan@microchip.com; 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 Tue, 23 Oct 2018 10:48:27 +0200
> > > Boris Brezillon <boris.brezillon@bootlin.com> wrote:
> > >
> > > > On Tue, 23 Oct 2018 08:18:35 +0000 Yogesh Narayan Gaur
> > > > <yogeshnarayan.gaur@nxp.com> wrote:
> > > >
> > > > >
> > > > > I have added the prints in m25p80_read() and in flexspi
> > > > > controller prepare_lut
> > > and read_rxfifo() func.
> > > > > In these have added prints for data variable of struct op and
> > > > > data which
> > > being read by the controller from the flash.
> > > > >
> > > > > [    2.091467] smpt[0]=3D[addr_width:00000003, read_dumy:00000008=
,
> > > read_opcode:00000065, data_mask:00000008]
> > > > > [    2.099113] m25p80_read, nor[op:00000065 addr_width:00000003,
> > > dummy:00000008, len:00000001
> > > > > [    2.107367] m25p80_read, cmd[opcode:65 bwidth:1] aadr[val:4,
> nbytes:3,
> > > bwidth:1]
> > > > > [    2.114753] m25p80_read, dummy[nbytes:1 bwidth:1] data[bwidth:=
1,
> > > nbytes:1]
> > > > > [    2.121706] nxp_fspi_prepare_lut cmd[opcode:65 bwidth:1] aadr[=
val:4,
> > > nbytes:3, bwidth:1]
> > > > > [    2.129786] dummy[nbytes:1 bwidth:1] data[dir:0 bwidth:1, nbyt=
es:1]
> > > > > [    2.136132] nxp-fspi 20c0000.flexspi: CMD[65] lutval[0:8180465
> > > 1:24003008      2:0     3:0]
> > > > > [    2.144223] nxp_fspi_read_rxfifo, ReadData op.buf[0x00]
> > > > > [    2.151004] smpt_read[1] addr[00000004], data_byte[00000000]
> > > err:00000000
> > > > >
> > > > >
> > > > > [    2.157782] smpt[2]=3D[addr_width:00000003, read_dumy:00000008=
,
> > > read_opcode:00000065, data_mask:00000004]
> > > > > [    2.165429] m25p80_read, nor[op:00000065 addr_width:00000003,
> > > dummy:00000008, len:00000001
> > > > > [    2.173683] m25p80_read, cmd[opcode:65 bwidth:1] aadr[val:2,
> nbytes:3,
> > > bwidth:1]
> > > > > [    2.181068] m25p80_read, dummy[nbytes:1 bwidth:1] data[bwidth:=
1,
> > > nbytes:1]
> > > > > [    2.188021] nxp_fspi_prepare_lut cmd[opcode:65 bwidth:1] aadr[=
val:2,
> > > nbytes:3, bwidth:1]
> > > > > [    2.196101] dummy[nbytes:1 bwidth:1] data[dir:0 bwidth:1, nbyt=
es:1]
> > > > > [    2.202447] nxp-fspi 20c0000.flexspi: CMD[65] lutval[0:8180465
> > > 1:24003008      2:0     3:0]
> > > > > [    2.210539] nxp_fspi_read_rxfifo, ReadData op.buf[0x02]
> > > > > [    2.217319] smpt_read[3] addr[00000002], data_byte[00000002]
> > > err:00000000
> > > > >
> > > > >
> > > > > [    2.224098] smpt[4]=3D[addr_width:00000003, read_dumy:00000008=
,
> > > read_opcode:00000065, data_mask:00000002]
> > > > > [    2.231744] m25p80_read, nor[op:00000065 addr_width:00000003,
> > > dummy:00000008, len:00000001
> > > > > [    2.239998] m25p80_read, cmd[opcode:65 bwidth:1] aadr[val:4,
> nbytes:3,
> > > bwidth:1]
> > > > > [    2.247383] m25p80_read, dummy[nbytes:1 bwidth:1] data[bwidth:=
1,
> > > nbytes:1]
> > > > > [    2.254336] nxp_fspi_prepare_lut cmd[opcode:65 bwidth:1] aadr[=
val:4,
> > > nbytes:3, bwidth:1]
> > > > > [    2.262416] dummy[nbytes:1 bwidth:1] data[dir:0 bwidth:1, nbyt=
es:1]
> > > > > [    2.268762] nxp-fspi 20c0000.flexspi: CMD[65] lutval[0:8180465
> > > 1:24003008      2:0     3:0]
> > > > > [    2.276854] nxp_fspi_read_rxfifo, ReadData op.buf[0x00]
> > > > > [    2.283634] smpt_read[5] addr[00000004], data_byte[00000000]
> > > err:00000000
> > > > >
> > > > >
> > > > > [    2.290412] spi_nor_get_map_in_use:2915 map_id=3D0 smpt_len:16=
 i=3D:6
> > > > > [    2.296496] End [addr_width:00000003, read_dumy:00000008,
> > > read_opcode:00000065] ReturnVal:00000000
> > > > > [    2.305444] spi_nor_parse_smpt:3065
> > > > > [    2.308924] m25p80 spi0.0: failed to parse SMPT (err =3D -22)
> > > > >
> > > > >
> > > > > >
> > > > > > 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.
> > > > >
> > > > > Please let me know how to read CR2NV register.
> > > >
> > > > Actually, RDAR is already what you use to read the map_id, and we
> > > > need to use it to read the register that contains the number of
> > > > dummy cycles and the number of address bytes to use for RDAR operat=
ions.
> > > > Looks like we have a chicken and egg situation here :-).
> > > >
> > > > Let's try something else:
> > > >
> > > > 1/ create an u8 array of 16 entries named data_bytes
> > > >
> > > > for each loop iteration (the first for loop):
> > > > 2/ set ->addr_width to 3 and ->read_dummy to 0 3/ call
> > > > spi_nor_read_raw(nor, addr, ARRAY_SIZE(data_bytes), data_bytes) 4/
> > > > dump the data_bytes buf 5/ set ->addr_width to 4 6/ call
> > > > spi_nor_read_raw(nor, addr, ARRAY_SIZE(data_bytes), data_bytes) 7/
> > > > dump the data_bytes buf
> > > >
> > > > If the SPI driver is working correctly, we should be able to
> > > > figure out the right value for ->addr_width and ->read_dummy.
> > >
> > > Also, can you add traces in nxp_fspi_read_rxfifo() to print the
> > > value returned by
> > > f->read(base + FSPI_RFDR + j * 4) (there are 2 of them).
> >
> > I have added this and printing the data content, all 4 bytes, after
> > each f->read(base + FSPI_RFDR + j * 4); This I have shown in the logs, =
only 1
> byte i.e. as we are reading only 1 byte so I have deleted content of rest=
 3 bytes
> when sending the logs in mail.
>=20
> But I do care about the remaining 3 bytes, otherwise I wouldn't ask you t=
o print
> them. Please print the full reg content using %08x.

Ok, logs with rxbuf content of 4 bytes, please check.
[    2.091412] smpt[0]=3D[addr_width:00000003, read_dumy:00000008, read_opc=
ode:00000065 data_mask:00000008]                       =20
[    2.100708] m25p80_read, nor[op:00000065 addr_width:00000003, dummy:0000=
0008, len:00000001                                   =20
[    2.108962] m25p80_read, cmd[opcode:65 bwidth:1] aadr[val:4, nbytes:3, b=
width:1]                                             =20
[    2.116349] m25p80_read, dummy[nbytes:1 bwidth:1] data[bwidth:1, nbytes:=
1]                                                   =20
[    2.123302] nxp_fspi_prepare_lut cmd[opcode:65 bwidth:1] aadr[val:4, nby=
tes:3, bwidth:1]                                     =20
[    2.131382] dummy[nbytes:1 bwidth:1] data[dir:0 bwidth:1, nbytes:1]     =
                                                     =20
[    2.137729] nxp-fspi 20c0000.flexspi: CMD[65] lutval[0:8180465        1:=
24003008      2:0     3:0]                           =20
[    2.145821] nxp_fspi_read_rxfifo, ReadData op.buf[0x00, 0x53, 0x46, 0x44=
]                                                    =20
[    2.152602] smpt_read[1] addr[00000004], data_byte[00000000] err:0000000=
0=20

                                                   =20
[    2.159380] smpt[2]=3D[addr_width:00000003, read_dumy:00000008, read_opc=
ode:00000065 data_mask:00000004]                       =20
[    2.168677] m25p80_read, nor[op:00000065 addr_width:00000003, dummy:0000=
0008, len:00000001                                   =20
[    2.176931] m25p80_read, cmd[opcode:65 bwidth:1] aadr[val:2, nbytes:3, b=
width:1]                                             =20
[    2.184318] m25p80_read, dummy[nbytes:1 bwidth:1] data[bwidth:1, nbytes:=
1]                                                   =20
[    2.191271] nxp_fspi_prepare_lut cmd[opcode:65 bwidth:1] aadr[val:2, nby=
tes:3, bwidth:1]                                     =20
[    2.199352] dummy[nbytes:1 bwidth:1] data[dir:0 bwidth:1, nbytes:1]     =
                                                     =20
[    2.205698] nxp-fspi 20c0000.flexspi: CMD[65] lutval[0:8180465        1:=
24003008      2:0     3:0]                           =20
[    2.213792] nxp_fspi_read_rxfifo, ReadData op.buf[0x02, 0x53, 0x46, 0x44=
]                                                    =20
[    2.220573] smpt_read[3] addr[00000002], data_byte[00000002] err:0000000=
0                                                    =20


[    2.227352] smpt[4]=3D[addr_width:00000003, read_dumy:00000008, read_opc=
ode:00000065 data_mask:00000002]                       =20
[    2.236648] m25p80_read, nor[op:00000065 addr_width:00000003, dummy:0000=
0008, len:00000001                                   =20
[    2.244902] m25p80_read, cmd[opcode:65 bwidth:1] aadr[val:4, nbytes:3, b=
width:1]                                             =20
[    2.252288] m25p80_read, dummy[nbytes:1 bwidth:1] data[bwidth:1, nbytes:=
1]                                                   =20
[    2.259242] nxp_fspi_prepare_lut cmd[opcode:65 bwidth:1] aadr[val:4, nby=
tes:3, bwidth:1]                                     =20
[    2.267322] dummy[nbytes:1 bwidth:1] data[dir:0 bwidth:1, nbytes:1]     =
                                                     =20
[    2.273669] nxp-fspi 20c0000.flexspi: CMD[65] lutval[0:8180465        1:=
24003008      2:0     3:0]                           =20
[    2.281761] nxp_fspi_read_rxfifo, ReadData op.buf[0x00, 0x53, 0x46, 0x44=
]                                                    =20
[    2.288541] smpt_read[5] addr[00000004], data_byte[00000000] err:0000000=
0                                                    =20


[    2.295320] spi_nor_get_map_in_use:2915 map_id=3D0 smpt_len:16 i=3D:6   =
                                                         =20
[    2.301405] End [addr_width:00000003, read_dumy:00000008, read_opcode:00=
000065] ReturnVal:00000000                           =20
[    2.310353] spi_nor_parse_smpt:3065                                     =
                                                     =20
[    2.313834] m25p80 spi0.0: failed to parse SMPT (err =3D -22)           =
                                =20