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 <1552380290-19951-5-git-send-email-yamada.masahiro@socionext.com> <20190312100257.4fa142d1@collabora.com>
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From:   Masahiro Yamada <yamada.masahiro@socionext.com>
Date:   Tue, 12 Mar 2019 18:47:53 +0900
Message-ID: <CAK7LNARVdQOfG_5Y9ZijiqgE2wxPVbsNXRmsyn0oQ65si4+DDw@mail.gmail.com>
Subject: Re: [PATCH v3 4/9] mtd: rawnand: denali: switch over to ->exec_op()
 from legacy hooks
To:     Boris Brezillon <boris.brezillon@collabora.com>
Cc:     Boris Brezillon <bbrezillon@kernel.org>,
        Richard Weinberger <richard@nod.at>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        Marek Vasut <marek.vasut@gmail.com>,
        linux-mtd <linux-mtd@lists.infradead.org>,
        Miquel Raynal <miquel.raynal@bootlin.com>,
        Brian Norris <computersforpeace@gmail.com>,
        David Woodhouse <dwmw2@infradead.org>
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Sender: linux-kernel-owner@vger.kernel.org
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On Tue, Mar 12, 2019 at 6:03 PM Boris Brezillon
<boris.brezillon@collabora.com> wrote:
>
> On Tue, 12 Mar 2019 17:44:45 +0900
> Masahiro Yamada <yamada.masahiro@socionext.com> wrote:
>
>
> > +
> > +static int denali_exec_instr(struct nand_chip *chip,
> > +                          const struct nand_op_instr *instr)
> > +{
> > +     struct denali_nand_info *denali = to_denali(chip);
> > +     bool width16 = chip->options & NAND_BUSWIDTH_16;
> > +
> > +     switch (instr->type) {
> > +     case NAND_OP_CMD_INSTR:
> > +             denali_exec_out8(denali, DENALI_MAP11_CMD,
> > +                              &instr->ctx.cmd.opcode, 1);
> > +             return 0;
> > +     case NAND_OP_ADDR_INSTR:
> > +             denali_exec_out8(denali, DENALI_MAP11_ADDR,
> > +                              instr->ctx.addr.addrs,
> > +                              instr->ctx.addr.naddrs);
> > +             return 0;
> > +     case NAND_OP_DATA_IN_INSTR:
> > +             (!instr->ctx.data.force_8bit && width16 ?
> > +              denali_exec_in16 :
> > +              denali_exec_in8)(denali, DENALI_MAP11_DATA,
> > +                               instr->ctx.data.buf.in,
> > +                               instr->ctx.data.len);
>
> I agree with Miquel, this statement tends to obfuscate the code, and
> it's not like an extra if will make a huge difference in term of LOC.


OK, I will add the following helpers. Before sending v4, I will wait
for more comments.


static void denali_exec_in(struct denali_controller *denali, u32 type,
                           u8 *buf, unsigned int len, bool width16)
{
        if (width16)
                denali_exec_in16(denali, type, buf, len);
        else
                denali_exec_in8(denali, type, buf, len);
}


static void denali_exec_out(struct denali_controller *denali, u32 type,
                            const u8 *buf, unsigned int len)
{
        if (width16)
                denali_exec_out16(denali, type, buf, len);
        else
                denali_exec_out8(denali, type, buf, len);
}


>
> > +             return 0;
> > +     case NAND_OP_DATA_OUT_INSTR:
> > +             (!instr->ctx.data.force_8bit && width16 ?
> > +              denali_exec_out16 :
> > +              denali_exec_out8)(denali, DENALI_MAP11_DATA,
> > +                                instr->ctx.data.buf.out,
> > +                                instr->ctx.data.len);
>
> Ditto.
>
> > +             return 0;
> > +     case NAND_OP_WAITRDY_INSTR:
> > +             return denali_exec_waitrdy(denali);
> > +     default:
> > +             WARN_ONCE(1, "unsupported NAND instruction type: %d\n",
> > +                       instr->type);
> > +
> > +             return -EINVAL;
> > +     }
> > +}
>
> ______________________________________________________
> Linux MTD discussion mailing list
> http://lists.infradead.org/mailman/listinfo/linux-mtd/


-- 
Best Regards
Masahiro Yamada