linux-kernel - Re: [PATCH v9 2/2] dmaengine: Add Xilinx zynqmp dma engine driver support

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Date:	Mon, 30 May 2016 11:47:01 +0530
From:	Shubhrajyoti Datta <shubhrajyoti.datta@...il.com>
To:	Kedareswara rao Appana <appana.durga.rao@...inx.com>
Cc:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Michal Simek <michal.simek@...inx.com>,
	Sören Brinkmann <soren.brinkmann@...inx.com>,
	vinod.koul@...el.com, dan.j.williams@...el.com, appanad@...inx.com,
	Moritz Fischer <moritz.fischer@...us.com>,
	Laurent Pinchart <laurent.pinchart@...asonboard.com>,
	luis@...ethencourt.com, devicetree@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	dmaengine@...r.kernel.org,
	Punnaiah Choudary Kalluri <punnaia@...inx.com>
Subject: Re: [PATCH v9 2/2] dmaengine: Add Xilinx zynqmp dma engine driver support

> + */
> +static void zynqmp_dma_update_desc_to_ctrlr(struct zynqmp_dma_chan *chan,
> +                                     struct zynqmp_dma_desc_sw *desc)
> +{
> +       dma_addr_t addr;
> +
> +       addr = desc->src_p;
> +       writel(addr, chan->regs + ZYNQMP_DMA_SRC_START_LSB);
> +       writel(upper_32_bits(addr), chan->regs + ZYNQMP_DMA_SRC_START_MSB);
Can we combine the two writes to a 64bit write.
It may be helpful on 64-bit systems.


> +       addr = desc->dst_p;
> +       writel(addr, chan->regs + ZYNQMP_DMA_DST_START_LSB);
> +       writel(upper_32_bits(addr), chan->regs + ZYNQMP_DMA_DST_START_MSB);
> +}