media: pt3: Use dma_set_mask_and_coherent() and simplify code

Use dma_set_mask_and_coherent() instead of unrolling it with some
dma_set_mask()+dma_set_coherent_mask().

Moreover, as stated in [1], dma_set_mask() with a 64-bit mask will never
fail if dev->dma_mask is non-NULL.
So, if it fails, the 32 bits case will also fail for the same reason.

Simplify code and remove some dead code accordingly.

[1]: https://lkml.org/lkml/2021/6/7/398Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Acked-by: Akihiro Tsukada <tskd08@gmail.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>

drivers/media/pci/pt3/pt3.c

@@ -707,18 +707,10 @@ static int pt3_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	if (ret < 0)
 		return ret;
 
-	ret = dma_set_mask(&pdev->dev, DMA_BIT_MASK(64));
-	if (ret == 0)
-		dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64));
-	else {
-		ret = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
-		if (ret == 0)
-			dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(32));
-		else {
-			dev_err(&pdev->dev, "Failed to set DMA mask\n");
-			return ret;
-		}
-		dev_info(&pdev->dev, "Use 32bit DMA\n");
+	ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to set DMA mask\n");
+		return ret;
 	}
 
 	pt3 = devm_kzalloc(&pdev->dev, sizeof(*pt3), GFP_KERNEL);