drm/mediatek: Stop using iommu_present()

Remove the pointless check. If an IOMMU is providing transparent DMA API
ops for any device(s) we care about, the DT code will have enforced the
appropriate probe ordering already. And if the IOMMU *is* entirely
absent, then attempting to go ahead with CMA and either suceeding or
failing decisively seems more useful than deferring forever.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://patchwork.kernel.org/project/dri-devel/patch/fd1b62aa006556f29f37535814abfe41be63f7ae.1700746094.git.robin.murphy@arm.com/
Signed-off-by: Chun-Kuang Hu <chunkuang.hu@kernel.org>

diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
index 2dfaa613276a6d7ef836b2bcbfc2ecac730466f1..48581da51857a4c5866ecd4662bc420b6a814f55 100644 (file)
--- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
+++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
@@ -5,7 +5,6 @@
  */
 
 #include <linux/component.h>
-#include <linux/iommu.h>
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_platform.h>
@@ -608,9 +607,6 @@ static int mtk_drm_bind(struct device *dev)
        struct drm_device *drm;
        int ret, i;
 
-       if (!iommu_present(&platform_bus_type))
-               return -EPROBE_DEFER;
-
        pdev = of_find_device_by_node(private->mutex_node);
        if (!pdev) {
                dev_err(dev, "Waiting for disp-mutex device %pOF\n",