On Fri, Jan 31, 2014 at 12:54:19PM +0100, Guennadi Liakhovetski wrote:
> According to the DMA API data has to be synchronised before starting
> a DMA transfer to device and after completing a DMA transfer from device.
>
> Signed-off-by: Guennadi Liakhovetski <g.liakhovet...@gmx.de>
Acked-by: Simon Horman <horms+rene...@verge.net.au>
> ---
> drivers/mmc/host/tmio_mmc_dma.c | 21 ++++++++++++---------
> 1 files changed, 12 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/mmc/host/tmio_mmc_dma.c b/drivers/mmc/host/tmio_mmc_dma.c
> index 65edb4a..a997b94 100644
> --- a/drivers/mmc/host/tmio_mmc_dma.c
> +++ b/drivers/mmc/host/tmio_mmc_dma.c
> @@ -168,9 +168,12 @@ static void tmio_mmc_start_dma_tx(struct tmio_mmc_host
> *host)
> }
>
> ret = dma_map_sg(chan->device->dev, sg, host->sg_len, DMA_TO_DEVICE);
> - if (ret > 0)
> + if (ret > 0) {
> + dma_sync_sg_for_device(chan->device->dev, sg, host->sg_len,
> + DMA_TO_DEVICE);
> desc = dmaengine_prep_slave_sg(chan, sg, ret,
> DMA_MEM_TO_DEV, DMA_CTRL_ACK);
> + }
>
> if (desc) {
> cookie = dmaengine_submit(desc);
> @@ -247,14 +250,14 @@ static void tmio_mmc_tasklet_fn(unsigned long arg)
> if (!host->data)
> goto out;
>
> - if (host->data->flags & MMC_DATA_READ)
> - dma_unmap_sg(host->chan_rx->device->dev,
> - host->sg_ptr, host->sg_len,
> - DMA_FROM_DEVICE);
> - else
> - dma_unmap_sg(host->chan_tx->device->dev,
> - host->sg_ptr, host->sg_len,
> - DMA_TO_DEVICE);
> + if (host->data->flags & MMC_DATA_READ) {
> + struct device *dev = host->chan_rx->device->dev;
> + dma_unmap_sg(dev, host->sg_ptr, host->sg_len, DMA_FROM_DEVICE);
> + dma_sync_sg_for_cpu(dev, host->sg_ptr, host->sg_len,
> DMA_FROM_DEVICE);
> + } else {
> + struct device *dev = host->chan_tx->device->dev;
> + dma_unmap_sg(dev, host->sg_ptr, host->sg_len, DMA_TO_DEVICE);
> + }
>
> tmio_mmc_do_data_irq(host);
> out:
> --
> 1.7.2.5
>
> --
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