media: raspberrypi: cfe: Fix mapping of dmabuf buffers

Commit be7de82 upstream

When using buffers from DRM, DMA-API gives a warning about: "mapping sg
segment longer than device claims to support [len=307200] [max=65536]"

Add a call to vb2_dma_contig_set_max_seg_size() to tell the DMA-API
about the supported segment size (which is UINT_MAX).

Fixes: 6edb685 ("media: raspberrypi: Add support for RP1-CFE")
Reviewed-by: Laurent Pinchart <[email protected]>
Signed-off-by: Tomi Valkeinen <[email protected]>
Signed-off-by: Sakari Ailus <[email protected]>
Signed-off-by: Hans Verkuil <[email protected]>

Author: tomba

drivers/media/platform/raspberrypi/rp1-cfe/cfe.c

@@ -2340,6 +2340,10 @@ static int cfe_probe(struct platform_device *pdev)
 		goto err_cfe_put;
 	}
 
+	ret = vb2_dma_contig_set_max_seg_size(&pdev->dev, UINT_MAX);
+	if (ret)
+		goto err_cfe_put;
+
 	/* TODO: Enable clock only when running. */
 	cfe->clk = devm_clk_get(&pdev->dev, NULL);
 	if (IS_ERR(cfe->clk)) {