linux-kernel - Re: [PATCH 07/10] spi, serial: move to dma_transfer

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Message-ID: <20111015190015.GB3128@mwesterb-mobl.ger.corp.intel.com>
Date:	Sat, 15 Oct 2011 22:00:15 +0300
From:	Mika Westerberg <mika.westerberg@....fi>
To:	Vinod Koul <vinod.koul@...el.com>
Cc:	dan.j.williams@...el.com, linux-kernel@...r.kernel.org,
	jaswinder.singh@...aro.org, 21cnbao@...il.com,
	rmk@....linux.org.uk, Vinod Koul <vinod.koul@...ux.intel.com>,
	Grant Likely <grant.likely@...retlab.ca>,
	Alan Cox <alan@...ux.intel.com>
Subject: Re: [PATCH 07/10] spi, serial: move to dma_transfer_direction

On Fri, Oct 14, 2011 at 11:08:22AM +0530, Vinod Koul wrote:

> diff --git a/drivers/spi/spi-ep93xx.c b/drivers/spi/spi-ep93xx.c
> index 1cf6454..8754a39 100644
> --- a/drivers/spi/spi-ep93xx.c
> +++ b/drivers/spi/spi-ep93xx.c
> @@ -550,6 +550,7 @@ ep93xx_spi_dma_prepare(struct ep93xx_spi *espi, enum dma_data_direction dir)
>  	struct dma_async_tx_descriptor *txd;
>  	enum dma_slave_buswidth buswidth;
>  	struct dma_slave_config conf;
> +	enum dma_transfer_direction slave_dirn;
>  	struct scatterlist *sg;
>  	struct sg_table *sgt;
>  	struct dma_chan *chan;
> @@ -572,6 +573,7 @@ ep93xx_spi_dma_prepare(struct ep93xx_spi *espi, enum dma_data_direction dir)
>  
>  		conf.src_addr = espi->sspdr_phys;
>  		conf.src_addr_width = buswidth;
> +		slave_dirn = DEV_TO_MEM;
>  	} else {
>  		chan = espi->dma_tx;
>  		buf = t->tx_buf;
> @@ -579,6 +581,7 @@ ep93xx_spi_dma_prepare(struct ep93xx_spi *espi, enum dma_data_direction dir)
>  
>  		conf.dst_addr = espi->sspdr_phys;
>  		conf.dst_addr_width = buswidth;
> +		slave_dirn = MEM_TO_DEV;
>  	}
>  
>  	ret = dmaengine_slave_config(chan, &conf);
> @@ -630,7 +633,7 @@ ep93xx_spi_dma_prepare(struct ep93xx_spi *espi, enum dma_data_direction dir)
>  		return ERR_PTR(-ENOMEM);
>  
>  	txd = chan->device->device_prep_slave_sg(chan, sgt->sgl, nents,
> -						 dir, DMA_CTRL_ACK);
> +						 slave_dirn, DMA_CTRL_ACK);
>  	if (!txd) {
>  		dma_unmap_sg(chan->device->dev, sgt->sgl, sgt->nents, dir);
>  		return ERR_PTR(-ENOMEM);

Can you also change the ep93xx_spi_setup_dma() function to use these new
values? Like the patch below.

Otherwise,

Acked-by: Mika Westerberg <mika.westerberg@....fi>

diff --git a/drivers/spi/spi-ep93xx.c b/drivers/spi/spi-ep93xx.c
index 66c3d9b..d97583f 100644
--- a/drivers/spi/spi-ep93xx.c
+++ b/drivers/spi/spi-ep93xx.c
@@ -982,7 +982,7 @@ static int ep93xx_spi_setup_dma(struct ep93xx_spi *espi)
 	dma_cap_set(DMA_SLAVE, mask);
 
 	espi->dma_rx_data.port = EP93XX_DMA_SSP;
-	espi->dma_rx_data.direction = DMA_FROM_DEVICE;
+	espi->dma_rx_data.direction = DEV_TO_MEM;
 	espi->dma_rx_data.name = "ep93xx-spi-rx";
 
 	espi->dma_rx = dma_request_channel(mask, ep93xx_spi_dma_filter,
@@ -993,7 +993,7 @@ static int ep93xx_spi_setup_dma(struct ep93xx_spi *espi)
 	}
 
 	espi->dma_tx_data.port = EP93XX_DMA_SSP;
-	espi->dma_tx_data.direction = DMA_TO_DEVICE;
+	espi->dma_tx_data.direction = MEM_TO_DEV;
 	espi->dma_tx_data.name = "ep93xx-spi-tx";
 
 	espi->dma_tx = dma_request_channel(mask, ep93xx_spi_dma_filter,
--
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