linux-kernel - Re: [PATCH] mtd: spi-nor: add support for sst26wf016, sst26wf032 memory

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Date:   Mon, 24 Jun 2019 17:58:25 +0000
From:   Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>
To:     "Eugeniy.Paltsev@...opsys.com" <Eugeniy.Paltsev@...opsys.com>,
        "marex@...x.de" <marex@...x.de>,
        "Tudor.Ambarus@...rochip.com" <Tudor.Ambarus@...rochip.com>,
        "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>
CC:     "miquel.raynal@...tlin.com" <miquel.raynal@...tlin.com>,
        "dwmw2@...radead.org" <dwmw2@...radead.org>,
        "marek.vasut@...il.com" <marek.vasut@...il.com>,
        "linux-snps-arc@...ts.infradead.org" 
        <linux-snps-arc@...ts.infradead.org>,
        "richard@....at" <richard@....at>,
        Alexey Brodkin <Alexey.Brodkin@...opsys.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "computersforpeace@...il.com" <computersforpeace@...il.com>
Subject: Re: [PATCH] mtd: spi-nor: add support for sst26wf016, sst26wf032
 memory

Hi Tudor,

On Sat, 2019-06-22 at 10:18 +0000, Tudor.Ambarus@...rochip.com wrote:
> Hi, Eugeniy,
> 
> On 06/07/2019 06:43 PM, Eugeniy Paltsev wrote:
> > External E-Mail
> > 
> > 
> > This commit adds support for the SST sst26wf016 and sst26wf032
> > flash memory IC.
> 
> Please specify if you tested both flashes, with 1-1-1, 1-1-2 and 1-1-4 reads.
> Let us know which controller you used. I ask for these to be sure that we don't
> add flashes that are broken from day one.
> 
> > Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@...opsys.com>
> > ---
> >  drivers/mtd/spi-nor/spi-nor.c | 2 ++
> >  1 file changed, 2 insertions(+)
> > 
> > diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
> > index 73172d7f512b..224275461a2c 100644
> > --- a/drivers/mtd/spi-nor/spi-nor.c
> > +++ b/drivers/mtd/spi-nor/spi-nor.c
> > @@ -1945,6 +1945,8 @@ static const struct flash_info spi_nor_ids[] = {
> >  	{ "sst25wf040b", INFO(0x621613, 0, 64 * 1024,  8, SECT_4K) },
> >  	{ "sst25wf040",  INFO(0xbf2504, 0, 64 * 1024,  8, SECT_4K | SST_WRITE) },
> >  	{ "sst25wf080",  INFO(0xbf2505, 0, 64 * 1024, 16, SECT_4K | SST_WRITE) },
> > +	{ "sst26wf016",  INFO(0xbf2651, 0, 64 * 1024, 32, SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) },
> 
> I confirm that the above is correct.
> 
> > +	{ "sst26wf032",  INFO(0xbf2622, 0, 64 * 1024, 64, SECT_4K | SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) },
> 
> There are sst26wf032 flashes that don't support SPINOR_OP_READ_1_1_2 (0x3b) and
> SPINOR_OP_READ_1_1_4 (0x6b), check
> https://urldefense.proofpoint.com/v2/url?u=https-3A__pdf1.alldatasheet.com_datasheet-2Dpdf_view_392063_SST_SST26WF032.html&d=DwIGaQ&c=DPL6_X_6JkXFx7AXWqB0tg&r=ZlJN1MriPUTkBKCrPSx67GmaplEUGcAEk9yPtCLdUXI&m=YKOAFhTsmcxVNOmy6DO67WYZYdo6xYa7ojebIBU-K-c&s=k2yRqWlXBllfG2R2HvqTwAjGYCmvjGm9tmVYxzDg_wA&e= .
> You
> can't add SPI_NOR_DUAL_READ and SPI_NOR_QUAD_READ if 0x3b and 0x6b commands are
> not supported. Check spi_nor_init_params().

Yep, thanks for pointing.
We are using 'sst26wf016b' on HSDK devboard. I added 'sst26wf032' to make flash upgrade easier,
but I don't check carefully enough that it has completely different control logic and not only size.
I'd better drop 'sst26wf032' in v2 patch respin as untested. 

In this setup we use "snps,dw-apb-ssi" SPI controller and we don't use dual/quad IO. Should I
drop (SPI_NOR_DUAL_READ | SPI_NOR_QUAD_READ) for "sst26wf016" in v2 respin?

> 
> Cheers,
> ta
-- 
 Eugeniy Paltsev