Messages in this thread | | | Date | Wed, 10 Sep 2014 09:46:04 +0530 | From | Varka Bhadram <> | Subject | Re: [PATCH v5] spi: spi-imx: add DMA support |
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On 09/10/2014 07:00 AM, Robin Gong wrote: > Enable DMA support on i.mx6. The read speed can increase from 600KB/s > to 1.2MB/s on i.mx6q. You can disable or enable dma function in dts.
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> + > +static int spi_imx_sdma_init(struct device *dev, struct spi_imx_data *spi_imx, > + struct spi_master *master, > + const struct resource *res) > +{ > + struct dma_slave_config slave_config = {}; > + int ret; > + > + /* Prepare for TX DMA: */ > + master->dma_tx = dma_request_slave_channel(dev, "tx"); > + if (!master->dma_tx) { > + dev_err(dev, "cannot get the TX DMA channel!\n"); > + ret = -EINVAL; > + goto err; > + } > + > + slave_config.direction = DMA_MEM_TO_DEV; > + slave_config.dst_addr = res->start + MXC_CSPITXDATA; > + slave_config.dst_addr_width = DMA_SLAVE_BUSWIDTH_1_BYTE; > + slave_config.dst_maxburst = spi_imx_get_fifosize(spi_imx) / 2; > + ret = dmaengine_slave_config(master->dma_tx, &slave_config); > + if (ret) { > + dev_err(dev, "error in TX dma configuration."); > +
Missed terminating new line..
-- Regards, Varka Bhadram.
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