linux-kernel - Re: [PATCH v9] mtd: spi-nor: Add support for S3AN spi-nor devices

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Date:   Wed, 18 Jan 2017 16:56:32 +0100
From:   Marek Vasut <marek.vasut@...il.com>
To:     Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>,
        Cyrille Pitchen <cyrille.pitchen@...ev4u.fr>
Cc:     Cyrille Pitchen <cyrille.pitchen@...el.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Boris Brezillon <boris.brezillon@...e-electrons.com>,
        Richard Weinberger <richard@....at>,
        "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v9] mtd: spi-nor: Add support for S3AN spi-nor devices

On 01/18/2017 04:46 PM, Ricardo Ribalda Delgado wrote:
> Hi Cyrille
> 
> I have found a bug on the way the address is generated in special
> mode. Do you prefer a v9 of this patch or a patch?

Subsequent patch, since this one is already applied.

Also please do not top-post.

Thanks

> Regards!
> 
> On Tue, Dec 13, 2016 at 5:30 PM, Cyrille Pitchen
> <cyrille.pitchen@...ev4u.fr> wrote:
>> Le 13/12/2016 à 08:53, Marek Vasut a écrit :
>>> On 12/02/2016 12:31 PM, Ricardo Ribalda Delgado wrote:
>>>> Xilinx Spartan-3AN FPGAs contain an In-System Flash where they keep
>>>> their configuration data and (optionally) some user data.
>>>>
>>>> The protocol of this flash follows most of the spi-nor standard. With
>>>> the following differences:
>>>>
>>>> - Page size might not be a power of two.
>>>> - The address calculation (default addressing mode).
>>>> - The spi nor commands used.
>>>>
>>>> Protocol is described on Xilinx User Guide UG333
>>>>
>>>> Reviewed-by: Cyrille Pitchen <cyrille.pitchen@...el.com>
>>>> Signed-off-by: Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
>>>> Cc: Boris Brezillon <boris.brezillon@...e-electrons.com>
>>>> Cc: Brian Norris <computersforpeace@...il.com>
>>>> Cc: Marek Vasut <marek.vasut@...il.com>
>>>
>>> [...]
>>>
>>>> +static int s3an_nor_scan(const struct flash_info *info, struct spi_nor *nor)
>>>> +{
>>>> +    int ret;
>>>> +    u8 val;
>>>> +
>>>> +    ret = nor->read_reg(nor, SPINOR_OP_XRDSR, &val, 1);
>>>> +    if (ret < 0) {
>>>> +            dev_err(nor->dev, "error %d reading XRDSR\n", (int) ret);
>>>> +            return ret;
>>>> +    }
>>>> +
>>>> +    nor->erase_opcode = SPINOR_OP_XSE;
>>>> +    nor->program_opcode = SPINOR_OP_XPP;
>>>> +    nor->read_opcode = SPINOR_OP_READ;
>>>> +    nor->flags |= SNOR_F_NO_OP_CHIP_ERASE ;
>>>
>>> NIT: You have an extra space before ;        ^
>>>
>>>> +
>>>> +    /*
>>>> +     * This flashes have a page size of 264 or 528 bytes (known as
>>>> +     * Default addressing mode). It can be changed to a more standard
>>>> +     * Power of two mode where the page size is 256/512. This comes
>>>> +     * with a price: there is 3% less of space, the data is corrupted
>>>> +     * and the page size cannot be changed back to default addressing
>>>> +     * mode.
>>>> +     *
>>>> +     * The current addressing mode can be read from the XRDSR register
>>>> +     * and should not be changed, because is a destructive operation.
>>>> +     */
>>>> +    if (val & XSR_PAGESIZE) {
>>>> +            /* Flash in Power of 2 mode */
>>>> +            nor->page_size = (nor->page_size == 264) ? 256 : 512;
>>>> +            nor->mtd.writebufsize = nor->page_size;
>>>> +            nor->mtd.size = 8 * nor->page_size * info->n_sectors;
>>>> +            nor->mtd.erasesize = 8 * nor->page_size;
>>>> +    } else {
>>>> +            /* Flash in Default addressing mode */
>>>> +            nor->flags |= SNOR_F_S3AN_ADDR_DEFAULT;
>>>> +    }
>>>> +
>>>> +    return 0;
>>>> +}
>>>
>>> Looks great otherwise:
>>> Reviewed-by: Marek Vasut <marek.vasut@...il.com>
>>>
>> Applied to git://github.com/spi-nor/linux.git
>>
>> I've removed the additional SPACE before ';' as reported by Marek.
>>
>> Thanks!
> 
> 
> 


-- 
Best regards,
Marek Vasut