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media: iommu/mediatek: Add probe_defer for smi-larb

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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 <yong.wu@mediatek.com>
Tested-by: Frank Wunderlich <frank-w@public-files.de> # BPI-R2/MT7623
Acked-by: Joerg Roedel <jroedel@suse.de>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
This commit is contained in:
Yong Wu 2022-01-17 08:05:01 +01:00 committed by Mauro Carvalho Chehab
parent 2fb0feed51
commit 7d09aaf831
2 changed files with 8 additions and 0 deletions
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4
drivers/iommu/mtk_iommu.c
View file

@ -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,

4
drivers/iommu/mtk_iommu_v1.c
View file

@ -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,