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

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Date:   Wed, 21 Sep 2016 09:57:23 +0200
From:   Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>
To:     Boris Brezillon <boris.brezillon@...e-electrons.com>
Cc:     Cyrille Pitchen <cyrille.pitchen@...el.com>,
        David Woodhouse <dwmw2@...radead.org>,
        Brian Norris <computersforpeace@...il.com>,
        Javier Martinez Canillas <javier@....samsung.com>,
        Stephen Warren <swarren@...dia.com>,
        Jagan Teki <jteki@...nedev.com>, Vignesh R <vigneshr@...com>,
        Marek Vasut <marex@...x.de>,
        Ezequiel García <ezequiel@...guardiasur.com.ar>,
        Rafał Miłecki <zajec5@...il.com>,
        Furquan Shaikh <furquan@...gle.com>,
        "linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mtd: spi-nor: Add support for S3AN spi-nor devices

Hi Boris

On Wed, Sep 21, 2016 at 9:07 AM, Boris Brezillon
<boris.brezillon@...e-electrons.com> wrote:
> Hi Ricardo,
>
> Please try to pass the version in your subject prefix (pass
> --subject-prefix="PATCH vX" to git format-patch).
>

Sorry about that.


> On Tue, 20 Sep 2016 17:45:51 +0200
> Ricardo Ribalda Delgado <ricardo.ribalda@...il.com> wrote:

>>  /*
>> + * This code converts an address to the Default Address Mode, that has non
>> + * power of two page sizes. We must support this mode because it is the default
>> + * mode supported by Xilinx tools, it can access the whole flash area and
>> + * changing over to the Power-of-two mode is irreversible and corrupts the
>> + * original data.
>> + */
>> +static loff_t spi_nor_s3an_addr_convert(struct spi_nor *nor, unsigned int addr)
>> +{
>> +     unsigned int offset;
>> +
>> +     offset = (nor->page_size == 264) ? (addr % 264) : (addr % 528);
>
> Can you send a new version with
>
>         offset = addr % nor->page_size;
>
> to see if kbuild test robot still complains.
>

This code:

static loff_t spi_nor_s3an_addr_convert(struct spi_nor *nor, loff_t addr)
{
unsigned int offset;

offset = addr % nor->page_size;

return ((addr - offset) << 1) | offset;
}


When built like:

   wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross
-O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        make.cross ARCH=blackfin

Produces this error:


drivers/built-in.o: In function `spi_nor_write':
drivers/mtd/spi-nor/spi-nor.c:(.text+0xfeb8): undefined reference to `__moddi3'
drivers/built-in.o: In function `spi_nor_read':
drivers/mtd/spi-nor/spi-nor.c:(.text+0x10248): undefined reference to `__moddi3'
drivers/built-in.o: In function `spi_nor_erase':
drivers/mtd/spi-nor/spi-nor.c:(.text+0x1034e): undefined reference to `__moddi3'
Makefile:956: recipe for target 'vmlinux' failed


But I think I found the right combination:


static loff_t spi_nor_s3an_addr_convert(struct spi_nor *nor, loff_t addr)
{
unsigned int offset = addr;

offset %= nor->page_size;

return ((addr - offset) << 1) | offset;
}


This one works fine on x86 and blackfin

Sending v7


Thanks!


-- 
Ricardo Ribalda