media: stm32: dcmi: perform dmaengine_slave_config at probe

Perform the dma channel configuration at probe time right after
the channel allocation since this is fixed for the whole lifetime
of the driver.

Signed-off-by: Alain Volmat <alain.volmat@foss.st.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

diff --git a/drivers/media/platform/st/stm32/stm32-dcmi.c b/drivers/media/platform/st/stm32/stm32-dcmi.c
index 619b0d981211e4eef5e0252939f7d42d3e1a94d4..787c5d778db2d25513207c1e740dc146b001aa90 100644 (file)
--- a/drivers/media/platform/st/stm32/stm32-dcmi.c
+++ b/drivers/media/platform/st/stm32/stm32-dcmi.c
@@ -301,23 +301,6 @@ static int dcmi_start_dma(struct stm32_dcmi *dcmi,
                          struct dcmi_buf *buf)
 {
        struct dma_async_tx_descriptor *desc = NULL;
-       struct dma_slave_config config;
-       int ret;
-
-       memset(&config, 0, sizeof(config));
-
-       config.src_addr = (dma_addr_t)dcmi->res->start + DCMI_DR;
-       config.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
-       config.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
-       config.dst_maxburst = 4;
-
-       /* Configure DMA channel */
-       ret = dmaengine_slave_config(dcmi->dma_chan, &config);
-       if (ret < 0) {
-               dev_err(dcmi->dev, "%s: DMA channel config failed (%d)\n",
-                       __func__, ret);
-               return ret;
-       }
 
        /*
         * Avoid call of dmaengine_terminate_sync() between
@@ -1888,6 +1871,7 @@ static int dcmi_probe(struct platform_device *pdev)
        struct vb2_queue *q;
        struct dma_chan *chan;
        struct dma_slave_caps caps;
+       struct dma_slave_config dma_config;
        struct clk *mclk;
        int ret = 0;
 
@@ -1954,6 +1938,19 @@ static int dcmi_probe(struct platform_device *pdev)
        if (!ret && caps.max_sg_burst)
                dcmi->dma_max_burst = caps.max_sg_burst * DMA_SLAVE_BUSWIDTH_4_BYTES;
 
+       memset(&dma_config, 0, sizeof(dma_config));
+
+       dma_config.src_addr = (dma_addr_t)dcmi->res->start + DCMI_DR;
+       dma_config.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+
+       /* Configure DMA channel */
+       ret = dmaengine_slave_config(chan, &dma_config);
+       if (ret < 0) {
+               dev_err(dcmi->dev, "%s: DMA channel config failed (%d)\n",
+                       __func__, ret);
+               goto err_dma_slave_config;
+       }
+
        spin_lock_init(&dcmi->irqlock);
        mutex_init(&dcmi->lock);
        mutex_init(&dcmi->dma_lock);
@@ -2072,6 +2069,7 @@ err_device_unregister:
        v4l2_device_unregister(&dcmi->v4l2_dev);
 err_media_device_cleanup:
        media_device_cleanup(&dcmi->mdev);
+err_dma_slave_config:
        dma_release_channel(dcmi->dma_chan);
 
        return ret;