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Date:   Mon, 27 Aug 2018 10:06:13 +0200
From:   Boris Brezillon <boris.brezillon@bootlin.com>
To:     Liu Xiang <liu.xiang6@zte.com.cn>
Cc:     linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org,
        han.xu@nxp.com, marek.vasut@gmail.com, dwmw2@infradead.org,
        computersforpeace@gmail.com, richard@nod.at, liuxiang_1999@126.com,
        Yogesh Narayan Gaur <yogeshnarayan.gaur@nxp.com>
Subject: Re: [PATCH] mtd: spi-nor: fsl-quadspi: fix read error for flash
 size larger than 16MB
Message-ID: <20180827100613.78823993@bbrezillon>
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On Sat, 18 Aug 2018 17:14:23 +0800
Liu Xiang <liu.xiang6@zte.com.cn> wrote:

> If the size of spi-nor flash is larger than 16MB, the read_opcode
> is set to SPINOR_OP_READ_1_1_4_4B, and fsl_qspi_get_seqid() will
> return -EINVAL when cmd is SPINOR_OP_READ_1_1_4_4B. This can
> cause read operation fail.
> 
> Signed-off-by: Liu Xiang <liu.xiang6@zte.com.cn>

I'm pretty sure you want to backport this fix. Can you add a Fixes tag
and CC stable?

Also, I'd like to have an Ack from someone working at NXP (Han,
Yogesh?).

Thanks,

Boris.

> ---
>  drivers/mtd/spi-nor/fsl-quadspi.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/mtd/spi-nor/fsl-quadspi.c b/drivers/mtd/spi-nor/fsl-quadspi.c
> index 7d9620c..64304a3 100644
> --- a/drivers/mtd/spi-nor/fsl-quadspi.c
> +++ b/drivers/mtd/spi-nor/fsl-quadspi.c
> @@ -478,6 +478,7 @@ static int fsl_qspi_get_seqid(struct fsl_qspi *q, u8 cmd)
>  {
>  	switch (cmd) {
>  	case SPINOR_OP_READ_1_1_4:
> +	case SPINOR_OP_READ_1_1_4_4B:
>  		return SEQID_READ;
>  	case SPINOR_OP_WREN:
>  		return SEQID_WREN;