linux-kernel - Re: [PATCH v2 0/5] mtd: spi-nor: Add support for Octal 8D-8D-8D mode

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Message-ID: <20200421092328.129308f6@collabora.com>
Date:   Tue, 21 Apr 2020 09:23:28 +0200
From:   Boris Brezillon <boris.brezillon@...labora.com>
To:     Mason Yang <masonccyang@...c.com.tw>
Cc:     broonie@...nel.org, tudor.ambarus@...rochip.com,
        miquel.raynal@...tlin.com, richard@....at, vigneshr@...com,
        juliensu@...c.com.tw, linux-kernel@...r.kernel.org,
        linux-mtd@...ts.infradead.org, linux-spi@...r.kernel.org,
        Pratyush Yadav <p.yadav@...com>
Subject: Re: [PATCH v2 0/5] mtd: spi-nor: Add support for Octal 8D-8D-8D
 mode

+Pratyush who's working on a similar patchet [1].

Hello Mason,

On Tue, 21 Apr 2020 14:39:42 +0800
Mason Yang <masonccyang@...c.com.tw> wrote:

> Hello,
> 
> This is repost of patchset from Boris Brezillon's
> [RFC,00/18] mtd: spi-nor: Proposal for 8-8-8 mode support [1].

I only quickly went through the patches you sent and saying it's a
repost of the RFC is a bit of a lie. You completely ignored the state
tracking I was trying to do to avoid leaving the flash in 8D mode when
suspending/resetting the board, and I think that part is crucial. If I
remember correctly, we already had this discussion so I must say I'm a
bit disappointed.

Can you sync with Pratyush? I think his series [1] is better in that it
tries to restore the flash in single-SPI mode before suspend (it's
missing the shutdown case, but that can be easily added I think). Of
course that'd be even better to have proper state tracking at the SPI
NOR level.

Regards,

Boris

[1]https://lkml.org/lkml/2020/3/13/659