Re: [PATCH v7 2/2] mtd: rawnand: Add NAND controller support on Intel LGM SoC

[Andy Shevchenko <andy.shevchenko@xxxxxxxxx>]

On Fri, May 15, 2020 at 4:48 PM kbuild test robot <lkp@xxxxxxxxx> wrote:

> sparse warnings: (new ones prefixed by >>)
>
> >> drivers/mtd/nand/raw/intel-nand-controller.c:441:24: sparse: sparse: incorrect type in argument 1 (different base types) @@    expected unsigned int val @@    got restricted __be32 [assignedunsigned int val @@
> >> drivers/mtd/nand/raw/intel-nand-controller.c:441:24: sparse:    expected unsigned int val
> >> drivers/mtd/nand/raw/intel-nand-controller.c:441:24: sparse:    got restricted __be32 [assigned] [usertype] reg
>    drivers/mtd/nand/raw/intel-nand-controller.c:444:24: sparse: sparse: incorrect type in argument 1 (different base types) @@    expected unsigned int val @@    got restricted __be32 [assignedunsigned int val @@
>    drivers/mtd/nand/raw/intel-nand-controller.c:444:24: sparse:    expected unsigned int val
>    drivers/mtd/nand/raw/intel-nand-controller.c:444:24: sparse:    got restricted __be32 [assigned] [usertype] reg
>
>    440                  reg = cpu_to_be32(*pdata++);
>  > 441                  writel(reg, ebu_host->hsnand + HSNAND_CMSG_0);
>    442
>    443                  reg = cpu_to_be32(*pdata);
>    444                  writel(reg, ebu_host->hsnand + HSNAND_CMSG_1);

On BE:
cpu_to_be32 -> no-op
writel() -> converts reg to LE

On LE:
cpu_to_be32 -> converts to BE
writel() -> no-op (in terms of conversion)

Seems to me that the proper API (if above is intended) should be swab32().
But something tells me that above is broken (or my understanding is wrong).

-- 
With Best Regards,
Andy Shevchenko

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