Hi, > -----Original Message----- > From: Boris Brezillon [mailto:boris.brezil...@bootlin.com] > Sent: Tuesday, October 23, 2018 2:31 PM > To: Yogesh Narayan Gaur <yogeshnarayan.g...@nxp.com> > Cc: cristian.bir...@microchip.com; Tudor Ambarus > <tudor.amba...@microchip.com>; rich...@nod.at; Mark Brown > <broo...@kernel.org>; linux-kernel@vger.kernel.org; > nicolas.fe...@microchip.com; marek.va...@gmail.com; > cyrille.pitc...@microchip.com; linux-...@lists.infradead.org; Cyrille Pitchen > <cyrille.pitc...@wedev4u.fr>; computersforpe...@gmail.com; > dw...@infradead.org; linux-arm-ker...@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.brezil...@bootlin.com> wrote: > > > On Tue, 23 Oct 2018 08:18:35 +0000 > > Yogesh Narayan Gaur <yogeshnarayan.g...@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]=[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. -- Regards Yogesh gaur
