Date:   Tue, 27 Jun 2017 22:03:08 +0200
From:   Cyrille Pitchen <cyrille.pitchen@...ev4u.fr>
To:     Cyrille Pitchen <cyrille.pitchen@...rochip.com>,
        marek.vasut@...il.com
Cc:     boris.brezillon@...e-electrons.com, richard@....at,
        linux-kernel@...r.kernel.org, linux-mtd@...ts.infradead.org,
        computersforpeace@...il.com
Subject: Re: [PATCH v3 0/2] mtd: spi-nor: parse Serial Flash Discoverable
 Parameters (SFDP) tables

Le 26/06/2017 à 15:09, Cyrille Pitchen a écrit :
> Hi all,
> 
> a new version of the SFDP patch based on next-20170626
> 
> tested on sama5d2 xplained with the following QSPI memories:
> Macronix
> - mx25l25673g
> 
> Spansion/Cypress
> - s25fl164
> - s25fl127
> - s25fl512
> 
> Winbond
> - w25q256
> - w25m512
> 
> SST
> - sst26vf064
> 
> Micron
> - m25q128
> - n25q128a
> - m25ql512
> - m25ql01g
> 
> For my tests, I used mtd_debug to erase, write then read back some areas
> inside data array of the SPI NOR flash memory.
> To verify the integrity of the data, I used sha1sum to compare the
> original file with the one read from the SPI flash memory.
> 
> For memories with a non-uniform erase map (sst26vf064, s25fl512, ...), I
> chose an offset in the data array so the sector size is the one set into
> nor->mtd.erasesize.
> 
> CONFIG_MTD_SPI_NOR_USE_4K_SECTORS was defined in my .config file.
> Older tests were also run with this macro undefined and with other memory
> parts.
> Here I'm only talking about tests performed within the last few days.
> 
> For sst26vf064, the Global Unlock Block Protection command was already
> sent to the memory by the bootloader so once in Linux, the memory was in a
> rw mode, otherwise Sector Erase and Page Program would fail.
> 
> Flash unlock (block protection) and  non-uniform erase map are out of the
> scope of this patch and would be addressed later in dedicated patches.
> 
> I added/updated few entries in the spi_nor_ids[] array so I could use all
> the memory parts listed above with SFDP support.
> 
> My s25fl127 sample is buggy and I don't know whether the issue has been
> fixed by Cypress with the later revisions of this part number (s25fl128s):
> The SFDP data programmed in my sample claim that the memory is compliant
> with JESD216 rev B (version 1.6) however DWORDs 10 to 16 of the Basic
> Flash Parameter Table are all 0xFFFFFFFF, only the first 9 DWORDs are
> programmed correctly as is the memory was only compliant with JESD216
> (version 1.0). Hence when testing the QER bits in DWORD15, the reserved
> value 111b is read. That why I've changed the default case for QER bits
> so it now returns -EINVAL when an unexpected value is read.
> So the SFDP data are reported as invalid and just ignored.
> I didn't use the SPI_NOR_SKIP_SFDP info->flags because s25fl127 and
> s25fl128s share the same JEDEC ID and I want to give a chance to use the
> SFDP tables of the later revisions of this memory part if the above
> issue has been fixed.
> 
> Best regards,
> 
> Cyrille
> 
> 
> ChangeLog
> 
> v2 > v3:
> - add a small patch to fix a conflict when the SPINOR_OP_RDSR2 macro was
>   defined twice: first in drivers/mtd/devices/serial_flash_cmds.h and
>   secondly in include/linux/mtd/spi-nor.h. It resulted in a build warning.
> - add the missing () in the kernel-doc comments for functions
> - add a Return: section in the kernel-doc comments for functions
> - improve spi_nor_read_sfdp() to take into account the case where all SFDP
>   data can't be read in a single nor->read() call.
> 
> v1 -> v2:
> - add kernel-doc to the main functions introduced by this patch.
> - rename spansion_new_quad_enable() into spansion_read_cr_quad_enable().
> - add spansion_no_read_cr_quad_enable(): the explanation is given in
>   the kernel-doc.
> - take Marek's comments into account (add new lines, remove parenthesis,
>   keep new error messages on the same line as dev_err(), already exisiting
>   error messages are left unchanged, use u32 instead of int for >>
>   operand, use sizeof(u32) instead of sizeof(uint32_t)).
> - propagate return code of spi_nor_read_sfdp().
> - handle the default case of the QER bits differently: now returns -EINVAL
> 
> 
> Cyrille Pitchen (2):
>   mtd: st_spi_fsm: remove SPINOR_OP_RDSR2 and use SPINOR_OP_RDCR instead
>   mtd: spi-nor: parse Serial Flash Discoverable Parameters (SFDP) tables
> 
>  drivers/mtd/devices/serial_flash_cmds.h |   1 -
>  drivers/mtd/devices/st_spi_fsm.c        |   4 +-
>  drivers/mtd/spi-nor/spi-nor.c           | 775 +++++++++++++++++++++++++++++++-
>  include/linux/mtd/spi-nor.h             |   6 +
>  4 files changed, 770 insertions(+), 16 deletions(-)
> 

series applied to the spi-nor/next branch of l2-mtd

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