Re: [PATCH v4 7/8] mtd: rawnand: arasan: Add new Arasan NAND controller

[Boris Brezillon <boris.brezillon@xxxxxxxxxxxxx>]

On Fri,  8 May 2020 19:13:38 +0200
Miquel Raynal <miquel.raynal@xxxxxxxxxxx> wrote:

> +static int anfc_len_to_steps(struct nand_chip *chip, unsigned int len)
> +{
> +	unsigned int steps = 1, pktsize = len;
> +
> +	while (pktsize > ANFC_MAX_PKT_SIZE) {
> +		steps *= 2;
> +		pktsize = DIV_ROUND_UP(len, steps);
> +	}


Same here, you shouldn't have a round_up() but instead complain if
"len != pkt_size * steps"

	if (len % 4)
		return -ENOTSUPP;

	if (len < ANFC_MAX_PKT_SIZE)
		return len;

	for (steps = 2; steps < ANFC_MAX_STEPS; steps *= 2) {
		pkt_size = len / steps;
		if (pkt_size <= ANFC_MAX_PKT_SIZE)
			break;
	}

	if (pkt_size * steps != len)
		return -ENOTSUPP;

	return pkt_size;

> +
> +	if (steps > ANFC_MAX_STEPS)
> +		return -ENOTSUPP;
> +
> +	return steps;
> +}