linux-kernel - Re: [PATCH 3/4] spi: mediatek: remove needless pair of writel()/readl()

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Date:	Fri, 20 Nov 2015 17:56:10 +0100
From:	Matthias Brugger <matthias.bgg@...il.com>
To:	Leilk Liu <leilk.liu@...iatek.com>, Mark Brown <broonie@...nel.org>
Cc:	Mark Rutland <mark.rutland@....com>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-spi@...r.kernel.org,
	linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH 3/4] spi: mediatek: remove needless pair of
 writel()/readl()



On 20/11/15 03:21, Leilk Liu wrote:
> It's not need to re-read and re-write SPI_CMD_REG, so remove it.
>
> Signed-off-by: Leilk Liu <leilk.liu@...iatek.com>
> ---
>   drivers/spi/spi-mt65xx.c |    3 ---
>   1 file changed, 3 deletions(-)
>
> diff --git a/drivers/spi/spi-mt65xx.c b/drivers/spi/spi-mt65xx.c
> index 7840067..6c1a96e 100644
> --- a/drivers/spi/spi-mt65xx.c
> +++ b/drivers/spi/spi-mt65xx.c
> @@ -154,9 +154,6 @@ static int mtk_spi_prepare_message(struct spi_master *master,
>   		reg_val |= SPI_CMD_CPOL;
>   	else
>   		reg_val &= ~SPI_CMD_CPOL;
> -	writel(reg_val, mdata->base + SPI_CMD_REG);
> -
> -	reg_val = readl(mdata->base + SPI_CMD_REG);
>
>   	/* set the mlsbx and mlsbtx */
>   	if (chip_config->tx_mlsb)
>

Reviewed-by: Matthias Brugger <matthias.bgg@...il.com>
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