linux-kernel - Re: [PATCH v4] spi: spi-imx: add DMA support

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Message-ID: <20140828095939.GA13274@Robin-OptiPlex-780>
Date:	Thu, 28 Aug 2014 17:59:41 +0800
From:	Robin Gong <b38343@...escale.com>
To:	sanjeev sharma <sanjeevsharmaengg@...il.com>
CC:	<broonie@...nel.org>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-spi@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	<Frank.Li@...escale.com>, <shawn.guo@...aro.org>, <marex@...x.de>
Subject: Re: [PATCH v4] spi: spi-imx: add DMA support

On Wed, Aug 27, 2014 at 11:12:08AM +0530, sanjeev sharma wrote:
> On Sat, Aug 23, 2014 at 5:43 AM, Robin Gong <b38343@...escale.com> wrote:
> 
> > +       /*
> > +        * Configure the DMA register: setup the watermark
> > +        * and enable DMA request.
> > +        */
> > +       if (spi_imx->dma_is_inited) {
> > +               dma = readl(spi_imx->base + MX51_ECSPI_DMA);
> > +
> > +               spi_imx->tx_wml = spi_imx_get_fifosize(spi_imx) / 2;
> > +               spi_imx->rx_wml = spi_imx_get_fifosize(spi_imx) / 2;
> > +               spi_imx->rxt_wml = spi_imx_get_fifosize(spi_imx) / 2;
> > +               rx_wml_cfg = spi_imx->rx_wml <<
> > MX51_ECSPI_DMA_RX_WML_OFFSET;
> > +               tx_wml_cfg = spi_imx->tx_wml <<
> > MX51_ECSPI_DMA_TX_WML_OFFSET;
> > +               rxt_wml_cfg = spi_imx->rxt_wml <<
> > MX51_ECSPI_DMA_RXT_WML_OFFSET;
> > +               dma = (dma & ~MX51_ECSPI_DMA_TX_WML_MASK
> > +                               & ~MX51_ECSPI_DMA_RX_WML_MASK
> > +                               & ~MX51_ECSPI_DMA_RXT_WML_MASK)
> > +                               | rx_wml_cfg | tx_wml_cfg | rxt_wml_cfg
> > +                               |(1 << MX51_ECSPI_DMA_TEDEN_OFFSET)
> > +                               |(1 << MX51_ECSPI_DMA_RXDEN_OFFSET)
> > +                               |(1 << MX51_ECSPI_DMA_RXTDEN_OFFSET);
> > +
> >
> 
> IMO, we should have an seperate function for dmactrl,rx_threshold &
> tx_threshold for better visiblity.
> 
>
I understood your concern, but I don't want to create one function only for
setting some bit fields of the register.
> >
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