linux-kernel - Re: [PATCH 1/2] spi: imx: dynamic burst length adjust for PIO mode

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Message-ID: <20170214182019.s3o5uphsfz4bxlkq@sirena.org.uk>
Date:   Tue, 14 Feb 2017 18:20:19 +0000
From:   Mark Brown <broonie@...nel.org>
To:     Jiada Wang <jiada_wang@...tor.com>
Cc:     linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org,
        fixed-term.Oleksij.Rempel@...bosch.com
Subject: Re: [PATCH 1/2] spi: imx: dynamic burst length adjust for PIO mode

On Wed, Feb 08, 2017 at 03:20:27PM +0900, Jiada Wang wrote:

This looks basically fine, a couple of fairly minor things here:

> +	for (i = 0; i < transfer->len / 4; i++) {
> +		u8 temp;
> +
> +		temp = *(buf + i * 4);
> +		*(buf + i * 4) = *(buf + i * 4 + 3);
> +		*(buf + i * 4 + 3) = temp;

Should this be using one of the cpu_to_ functions?  It's a bit unclear
what the goal is here and if it'll work if the kernel is big endian
(which people do do with i.MX systems IIRC).

> +	if (spi_imx->bpw_w == 1)
> +		spi_imx_buf_rx_u8(spi_imx);
> +	else if (spi_imx->bpw_w == 2)
> +		spi_imx_buf_rx_u16(spi_imx);

switch statement please.

> +	if (spi_imx->dynamic_burst) {
> +		spi_imx->count_index =
> +				spi_imx->count > MX51_ECSPI_CTRL_MAX_BURST ?
> +				spi_imx->count % MX51_ECSPI_CTRL_MAX_BURST :
> +				spi_imx->count % sizeof(u32);

Just write a normal if statement please, it's easier to read.

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