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Message-ID: <20181023111027.54df8650@bbrezillon>
Date: Tue, 23 Oct 2018 11:10:27 +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 09:05:23 +0000
Yogesh Narayan Gaur <yogeshnarayan.gaur@....com> wrote:
> Hi,
>
> > -----Original Message-----
> > From: Boris Brezillon [mailto:boris.brezillon@...tlin.com]
> > Sent: Tuesday, October 23, 2018 2:31 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 Tue, 23 Oct 2018 10:48:27 +0200
> > Boris Brezillon <boris.brezillon@...tlin.com> wrote:
> >
> > > On Tue, 23 Oct 2018 08:18:35 +0000
> > > Yogesh Narayan Gaur <yogeshnarayan.gaur@....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]=[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, nbytes: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]=[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, nbytes: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]=[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, nbytes: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=0 smpt_len:16 i=: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 = -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 operations.
> > > 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.
But I do care about the remaining 3 bytes, otherwise I wouldn't ask you
to print them. Please print the full reg content using %08x.
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