linux-kernel - Re: [PATCH 01/10] spi: spi-axi-spi-engine: remove usage of delay

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Date:   Mon, 8 Mar 2021 17:42:06 +0100
From:   Lars-Peter Clausen <lars@...afoo.de>
To:     Alexandru Ardelean <aardelean@...iqon.com>,
        linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org,
        greybus-dev@...ts.linaro.org, devel@...verdev.osuosl.org,
        linux-tegra@...r.kernel.org, bcm-kernel-feedback-list@...adcom.com
Cc:     broonie@...nel.org, gregkh@...uxfoundation.org, elder@...nel.org,
        johan@...nel.org, vireshk@...nel.org, rmfrfs@...il.com,
        f.fainelli@...il.com, ldewangan@...dia.com,
        thierry.reding@...il.com, jonathanh@...dia.com, linux@...iqon.com
Subject: Re: [PATCH 01/10] spi: spi-axi-spi-engine: remove usage of
 delay_usecs

On 3/8/21 3:54 PM, Alexandru Ardelean wrote:
> The 'delay_usecs' field was handled for backwards compatibility in case
> there were some users that still configured SPI delay transfers with
> this field.
>
> They should all be removed by now.
>
> Signed-off-by: Alexandru Ardelean <aardelean@...iqon.com>
> ---
>   drivers/spi/spi-axi-spi-engine.c | 12 ++++--------
>   1 file changed, 4 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/spi/spi-axi-spi-engine.c b/drivers/spi/spi-axi-spi-engine.c
> index af86e6d6e16b..80c3e38f5c1b 100644
> --- a/drivers/spi/spi-axi-spi-engine.c
> +++ b/drivers/spi/spi-axi-spi-engine.c
> @@ -170,14 +170,10 @@ static void spi_engine_gen_sleep(struct spi_engine_program *p, bool dry,
>   	unsigned int t;
>   	int delay;
>   
> -	if (xfer->delay_usecs) {
> -		delay = xfer->delay_usecs;
> -	} else {
> -		delay = spi_delay_to_ns(&xfer->delay, xfer);
> -		if (delay < 0)
> -			return;
> -		delay /= 1000;
> -	}
> +	delay = spi_delay_to_ns(&xfer->delay, xfer);
> +	if (delay < 0)
> +		return;

Bit of a nit, but this could be `delay <= 0` and then drop the check for 
`delay == 0` below.

> +	delay /= 1000;
>   
>   	if (delay == 0)
>   		return;