diff options
| author | Peter Ujfalusi <peter.ujfalusi@ti.com> | 2015-10-14 11:42:47 (GMT) |
|---|---|---|
| committer | Vinod Koul <vinod.koul@intel.com> | 2015-10-14 14:27:11 (GMT) |
| commit | dc9b60552f6a6a56b1defb88aa9f7f1498fcc045 (patch) | |
| tree | 9fc445b22bce2f9517ad8998d992f63da26bee42 /drivers/dma/edma.c | |
| parent | d4cb7f404247173e2c760a01bf06fd1016a8b0d4 (diff) | |
| download | linux-dc9b60552f6a6a56b1defb88aa9f7f1498fcc045.tar.xz | |
ARM/dmaengine: edma: Move of_dma_controller_register to the dmaengine driver
If the of_dma_controller is registered in the non dmaengine driver we could
have race condition:
the of_dma_controller has been registered, but the dmaengine driver is not
yet probed. Drivers requesting DMA channels during this window will fail
since we do not yet have dmaengine drivers registered.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma/edma.c')
| -rw-r--r-- | drivers/dma/edma.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/drivers/dma/edma.c b/drivers/dma/edma.c index 19fa49d..fcb4680 100644 --- a/drivers/dma/edma.c +++ b/drivers/dma/edma.c @@ -25,6 +25,7 @@ #include <linux/slab.h> #include <linux/spinlock.h> #include <linux/of.h> +#include <linux/of_dma.h> #include <linux/platform_data/edma.h> @@ -987,9 +988,14 @@ static void edma_dma_init(struct edma_cc *ecc, struct dma_device *dma, INIT_LIST_HEAD(&dma->channels); } +static struct of_dma_filter_info edma_filter_info = { + .filter_fn = edma_filter_fn, +}; + static int edma_probe(struct platform_device *pdev) { struct edma_cc *ecc; + struct device_node *parent_node = pdev->dev.parent->of_node; int ret; ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32)); @@ -1024,6 +1030,13 @@ static int edma_probe(struct platform_device *pdev) platform_set_drvdata(pdev, ecc); + if (parent_node) { + dma_cap_set(DMA_SLAVE, edma_filter_info.dma_cap); + dma_cap_set(DMA_CYCLIC, edma_filter_info.dma_cap); + of_dma_controller_register(parent_node, of_dma_simple_xlate, + &edma_filter_info); + } + dev_info(&pdev->dev, "TI EDMA DMA engine driver\n"); return 0; @@ -1037,7 +1050,10 @@ static int edma_remove(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct edma_cc *ecc = dev_get_drvdata(dev); + struct device_node *parent_node = pdev->dev.parent->of_node; + if (parent_node) + of_dma_controller_free(parent_node); dma_async_device_unregister(&ecc->dma_slave); edma_free_slot(ecc->dummy_slot); |