diff mbox series

[v5,02/16] iommu/mediatek: Add probe_defer for smi-larb

Message ID 20210410091128.31823-3-yong.wu@mediatek.com (mailing list archive)
State New, archived
Headers show
Series Clean up "mediatek,larb" | expand

Commit Message

Yong Wu (吴勇) April 10, 2021, 9:11 a.m. UTC 
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 consumer always is 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.

This is a preparing patch for adding device_link.

Signed-off-by: Yong Wu <yong.wu@mediatek.com>
---
To Matthias,

In v2, You suggested use device_is_bound here. But from [1], this
interface is not allowed to be EXPORT. It will affect this driver
built as module. thus I still use dev.driver to check here.

[1] https://lore.kernel.org/patchwork/patch/1334670/
---
 drivers/iommu/mtk_iommu.c    | 2 +-
 drivers/iommu/mtk_iommu_v1.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/drivers/iommu/mtk_iommu.c b/drivers/iommu/mtk_iommu.c
index 6ecc007f07cd..7a7b8260d308 100644
--- a/drivers/iommu/mtk_iommu.c
+++ b/drivers/iommu/mtk_iommu.c
@@ -862,7 +862,7 @@  static int mtk_iommu_probe(struct platform_device *pdev)
 			id = i;
 
 		plarbdev = of_find_device_by_node(larbnode);
-		if (!plarbdev) {
+		if (!plarbdev || !plarbdev->dev.driver) {
 			of_node_put(larbnode);
 			return -EPROBE_DEFER;
 		}
diff --git a/drivers/iommu/mtk_iommu_v1.c b/drivers/iommu/mtk_iommu_v1.c
index 82ddfe9170d4..a82466e4046e 100644
--- a/drivers/iommu/mtk_iommu_v1.c
+++ b/drivers/iommu/mtk_iommu_v1.c
@@ -597,7 +597,7 @@  static int mtk_iommu_probe(struct platform_device *pdev)
 			plarbdev = of_platform_device_create(
 						larb_spec.np, NULL,
 						platform_bus_type.dev_root);
-			if (!plarbdev) {
+			if (!plarbdev || !plarbdev->dev.driver) {
 				of_node_put(larb_spec.np);
 				return -EPROBE_DEFER;
 			}