linux-kernel - Re: [PATCH v4 12/16] mtd: spi-nor: perform a Soft Reset on shutdown

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Message-ID: <6809202.hICg0JTlGu@192.168.0.120>
Date:   Sun, 10 May 2020 11:22:17 +0000
From:   <Tudor.Ambarus@...rochip.com>
To:     <p.yadav@...com>
CC:     <miquel.raynal@...tlin.com>, <richard@....at>, <vigneshr@...com>,
        <broonie@...nel.org>, <Nicolas.Ferre@...rochip.com>,
        <alexandre.belloni@...tlin.com>, <Ludovic.Desroches@...rochip.com>,
        <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <linux-spi@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <nsekhar@...com>
Subject: Re: [PATCH v4 12/16] mtd: spi-nor: perform a Soft Reset on shutdown

Hi, Pratyush,

On Friday, April 24, 2020 9:44:06 PM EEST Pratyush Yadav wrote:
> A Software Reset sequence will return the flash to Power-on-Reset (POR)
> state. It consists of two commands: Soft Reset Enable and Soft Reset.
> 
> Perform a Soft Reset on shutdown on flashes that support it so that the
> flash can be reset to its initial state and any configurations made by
> spi-nor (given that they're only done in volatile registers) will be
> reset. This will hand back the flash in pristine state for any further
> operations on it.

Please don't introduce SPI_NOR_SOFT_RESET yet. We should instead determine the 
software reset sequence by inspecting BFPT[16], bits 13:8.

Cheers,
ta