[PATCH v1] dmaengine: imx-sdma: refine to load context only once

[Robin Gong]

The context loaded only one time before channel running,but
currently sdma_config_channel() and dma_prep_* duplicated with
sdma_load_context(), so refine it to load context only one time
before channel running and reload after the channel terminated.

Signed-off-by: Robin Gong <yibin.g...@nxp.com>
---
 drivers/dma/imx-sdma.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/dma/imx-sdma.c b/drivers/dma/imx-sdma.c
index a2b0a0e..015c17a 100644
--- a/drivers/dma/imx-sdma.c
+++ b/drivers/dma/imx-sdma.c
@@ -377,6 +377,7 @@ struct sdma_channel {
        unsigned long                   watermark_level;
        u32                             shp_addr, per_addr;
        enum dma_status                 status;
+       bool                            context_loaded;
        struct imx_dma_data             data;
        struct work_struct              terminate_worker;
 };
@@ -970,6 +971,9 @@ static int sdma_load_context(struct sdma_channel *sdmac)
        int ret;
        unsigned long flags;
 
+       if (sdmac->context_loaded)
+               return 0;
+
        if (sdmac->direction == DMA_DEV_TO_MEM)
                load_address = sdmac->pc_from_device;
        else if (sdmac->direction == DMA_DEV_TO_DEV)
@@ -1012,6 +1016,8 @@ static int sdma_load_context(struct sdma_channel *sdmac)
 
        spin_unlock_irqrestore(&sdma->channel_0_lock, flags);
 
+       sdmac->context_loaded = true;
+
        return ret;
 }
 
@@ -1051,6 +1057,7 @@ static void sdma_channel_terminate_work(struct 
work_struct *work)
        sdmac->desc = NULL;
        spin_unlock_irqrestore(&sdmac->vc.lock, flags);
        vchan_dma_desc_free_list(&sdmac->vc, &head);
+       sdmac->context_loaded = false;
 }
 
 static int sdma_disable_channel_async(struct dma_chan *chan)
-- 
2.7.4