RE: [LINUX PATCH v11 3/3] mtd: rawnand: arasan: Add support for Arasan NAND Flash Controller

[Naga Sureshkumar Relli]

Hi Boris,

> -----Original Message-----
> From: Boris Brezillon [mailto:boris.brezillon@xxxxxxxxxxx]
> Sent: Thursday, October 4, 2018 1:17 AM
> To: Naga Sureshkumar Relli <nagasure@xxxxxxxxxx>
> Cc: miquel.raynal@xxxxxxxxxxx; richard@xxxxxx; dwmw2@xxxxxxxxxxxxx;
> computersforpeace@xxxxxxxxx; marek.vasut@xxxxxxxxx; Michal Simek
> <michals@xxxxxxxxxx>; linux-mtd@xxxxxxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx;
> nagasuresh12@xxxxxxxxx
> Subject: Re: [LINUX PATCH v11 3/3] mtd: rawnand: arasan: Add support for Arasan
> NAND Flash Controller
> 
> On Tue, 25 Sep 2018 17:50:31 +0530
> Naga Sureshkumar Relli <naga.sureshkumar.relli@xxxxxxxxxx> wrote:
> 
> > +static int anfc_zero_len_page_write_type_exec(struct nand_chip *chip,
> > +					      const struct nand_subop *subop) {
> > +	const struct nand_op_instr *instr;
> > +	struct anfc_nand_chip *achip = to_anfc_nand(chip);
> > +	struct anfc_nand_controller *nfc = to_anfc(chip->controller);
> > +	unsigned int op_id;
> > +	struct anfc_op nfc_op = {};
> > +	struct mtd_info *mtd = nand_to_mtd(chip);
> > +	u32 addrcycles;
> > +
> > +	anfc_parse_instructions(chip, subop, &nfc_op);
> > +	nfc->prog = PROG_PGRD;
> > +	instr = nfc_op.data_instr;
> > +	op_id = nfc_op.data_instr_idx;
> > +
> > +	addrcycles = achip->raddr_cycles + achip->caddr_cycles;
> > +
> > +	anfc_prepare_cmd(nfc, nfc_op.cmds[0], NAND_CMD_PAGEPROG, 1,
> 
> Why are the second opcode and the number of address cycles hardcoded.
> That's simply not future-proof, and I don't want that. Also, I don't understand why you do
> that, you have all the information you need in subop and you keep guessing some parameters.
Ok, I will remove all these hard coding commands from the driver, instead I will use nfc_op.cmds[0], nfc_op.cmds[1].

Thanks,
Naga Sureshkumar Relli
> 
> > +			 mtd->writesize, addrcycles);
> > +	anfc_setpagecoladdr(nfc, nfc_op.row, nfc_op.col);
> > +
> > +	return 0;
> > +}