From 7d09aaf831b35ab62c5c24efbe716b8f60ad46ad Mon Sep 17 00:00:00 2001 From: Yong Wu Date: Mon, 17 Jan 2022 08:05:01 +0100 Subject: media: iommu/mediatek: Add probe_defer for smi-larb Prepare for adding device_link. The iommu consumer should use device_link to connect with the smi-larb(supplier). then the smi-larb should run before the iommu consumer. Here we delay the iommu driver until the smi driver is ready, then all the iommu consumers always are after the smi driver. When there is no this patch, if some consumer drivers run before smi-larb, the supplier link_status is DL_DEV_NO_DRIVER(0) in the device_link_add, then device_links_driver_bound will use WARN_ON to complain that the link_status of supplier is not right. device_is_bound may be more elegant here. but it is not allowed to EXPORT from https://lore.kernel.org/patchwork/patch/1334670/. Signed-off-by: Yong Wu Tested-by: Frank Wunderlich # BPI-R2/MT7623 Acked-by: Joerg Roedel Reviewed-by: AngeloGioacchino Del Regno Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab --- drivers/iommu/mtk_iommu.c | 4 ++++ drivers/iommu/mtk_iommu_v1.c | 4 ++++ 2 files changed, 8 insertions(+) (limited to 'drivers/iommu') diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c index 77ae20ff9b35..5cff5bc556d4 100644 --- a/drivers/iommu/mtk_iommu.c +++ b/drivers/iommu/mtk_iommu.c @@ -850,6 +850,10 @@ static int mtk_iommu_probe(struct platform_device *pdev) of_node_put(larbnode); return -ENODEV; } + if (!plarbdev->dev.driver) { + of_node_put(larbnode); + return -EPROBE_DEFER; + } data->larb_imu[id].dev = &plarbdev->dev; component_match_add_release(dev, &match, release_of, diff --git a/drivers/iommu/mtk_iommu_v1.c b/drivers/iommu/mtk_iommu_v1.c index 68bf02f87cfd..4089077256f4 100644 --- a/drivers/iommu/mtk_iommu_v1.c +++ b/drivers/iommu/mtk_iommu_v1.c @@ -606,6 +606,10 @@ static int mtk_iommu_probe(struct platform_device *pdev) of_node_put(larbnode); return -ENODEV; } + if (!plarbdev->dev.driver) { + of_node_put(larbnode); + return -EPROBE_DEFER; + } data->larb_imu[i].dev = &plarbdev->dev; component_match_add_release(dev, &match, release_of, -- cgit v1.2.3