linux-kernel - Re: [PATCH v3 1/2] mtd: spi-nor: add support to non-uniform SFDP SPI NOR flash memories

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Message-ID: <20181016140411.3f06e449@bbrezillon>
Date:   Tue, 16 Oct 2018 14:04:11 +0200
From:   Boris Brezillon <boris.brezillon@...tlin.com>
To:     Yogesh Narayan Gaur <yogeshnarayan.gaur@....com>
Cc:     Tudor Ambarus <tudor.ambarus@...rochip.com>,
        "marek.vasut@...il.com" <marek.vasut@...il.com>,
        "dwmw2@...radead.org" <dwmw2@...radead.org>,
        "computersforpeace@...il.com" <computersforpeace@...il.com>,
        "richard@....at" <richard@....at>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "nicolas.ferre@...rochip.com" <nicolas.ferre@...rochip.com>,
        "cyrille.pitchen@...rochip.com" <cyrille.pitchen@...rochip.com>,
        "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "Cristian.Birsan@...rochip.com" <Cristian.Birsan@...rochip.com>
Subject: Re: [PATCH v3 1/2] mtd: spi-nor: add support to non-uniform SFDP
 SPI NOR flash memories

On Tue, 16 Oct 2018 09:51:47 +0000
Yogesh Narayan Gaur <yogeshnarayan.gaur@....com> wrote:

> Hi Tudor,
> 
> This patch is breaking the 1-4-4 Read protocol for the spansion flash "s25fl512s".
> 
> Without this patch read request command for Quad mode, 4-byte enable, is coming as 0xEC i.e. SPINOR_OP_READ_1_4_4_4B.
> But after applying this patch, read request command for Quad mode is coming as 0x6C i.e. SPINOR_OP_READ_1_1_4_4B.
> 
> This flash also supports non-uniform erase.
> Can you please check and provide some suggestion?

Are you sure the regression comes from this patch? I suspect your bug
comes from 41fe242979e4 ("mtd: spi-nor: fsl-quadspi: fix read error for
flash size larger than 16MB").