linux-kernel - Re: [PATCH] mtd: spi-nor: parse SFDP 4-byte Address Instruction Table

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Date:   Wed, 28 Nov 2018 15:22:45 +0100
From:   Boris Brezillon <boris.brezillon@...tlin.com>
To:     <Tudor.Ambarus@...rochip.com>, <linux-mtd@...ts.infradead.org>
Cc:     <marek.vasut@...il.com>, <dwmw2@...radead.org>,
        <computersforpeace@...il.com>, <richard@....at>,
        <Cyrille.Pitchen@...rochip.com>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mtd: spi-nor: parse SFDP 4-byte Address Instruction
 Table

On Wed, 28 Nov 2018 14:17:12 +0000
<Tudor.Ambarus@...rochip.com> wrote:

> On 11/28/2018 09:57 AM, Boris Brezillon wrote:
> > On Tue, 20 Nov 2018 11:55:21 +0000
> > <Tudor.Ambarus@...rochip.com> wrote:
> >   
> >> +
> >> +	/*
> >> +	 * We set nor->addr_width here to skip spi_nor_set_4byte_opcodes()
> >> +	 * later because this latest function implements a legacy quirk for
> >> +	 * the erase size of Spansion memory. However this quirk is no longer
> >> +	 * needed with new SFDP compliant memories.
> >> +	 */
> >> +	nor->addr_width = 4;
> >> +	nor->flags |= SPI_NOR_4B_OPCODES;  
> > 
> > You mean SNOR_F_4B_OPCODES (the one introduced here [1]), because
> > SPI_NOR_4B_OPCODES should only be used for flash_info->flags and might
> > soon conflict with another SNOR_F_ flag?
> >   
> 
> yes, you're right.
> 
> > [1]http://patchwork.ozlabs.org/patch/991476/
> >   
> 
> Can you apply your patch? Will submit a new version afterwards.

Actually, I realized setting SNOR_F_4B_OPCODES when the BFPT advertises
4_BYTES_ONLY is incorrect as 4bytes only can mean "use the 3B opcodes
but pass address on 4 bytes". Here is a new version of this patch [1].
Feel free to pick it up and send it along with your "SFDP 4-byte Address
Instruction Table" patch (I have not reason to send it alone since the
problem I was trying to solve is no longer fixed by [1]).

[1]https://github.com/bbrezillon/linux-0day/commit/a953b6b435ec67bca00d6666f472db5f6dca4f63