iommu/rockchip: Move irq request past pm_runtime_enable

Enabling the interrupt early, before power has been applied to the
device, can result in an interrupt being delivered too early if:

- the IOMMU shares an interrupt with a VOP
- the VOP has a pending interrupt (after a kexec, for example)

In these conditions, we end-up taking the interrupt without
the IOMMU being ready to handle the interrupt (not powered on).

Moving the interrupt request past the pm_runtime_enable() call
makes sure we can at least access the IOMMU registers. Note that
this is only a partial fix, and that the VOP interrupt will still
be screaming until the VOP driver kicks in, which advocates for
a more synchronized interrupt enabling/disabling approach.

Fixes: 0f181d3cf7d98 ("iommu/rockchip: Add runtime PM support")
Reviewed-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Olof Johansson <olof@lixom.net>

diff --git a/drivers/iommu/rockchip-iommu.c b/drivers/iommu/rockchip-iommu.c
index 4e0f9b6..2b1724e 100644 (file)
--- a/drivers/iommu/rockchip-iommu.c
+++ b/drivers/iommu/rockchip-iommu.c
@@ -1161,17 +1161,6 @@ static int rk_iommu_probe(struct platform_device *pdev)
        if (iommu->num_mmu == 0)
                return PTR_ERR(iommu->bases[0]);
 
-       i = 0;
-       while ((irq = platform_get_irq(pdev, i++)) != -ENXIO) {
-               if (irq < 0)
-                       return irq;
-
-               err = devm_request_irq(iommu->dev, irq, rk_iommu_irq,
-                                      IRQF_SHARED, dev_name(dev), iommu);
-               if (err)
-                       return err;
-       }
-
        iommu->reset_disabled = device_property_read_bool(dev,
                                        "rockchip,disable-mmu-reset");
 
@@ -1228,6 +1217,19 @@ static int rk_iommu_probe(struct platform_device *pdev)
 
        pm_runtime_enable(dev);
 
+       i = 0;
+       while ((irq = platform_get_irq(pdev, i++)) != -ENXIO) {
+               if (irq < 0)
+                       return irq;
+
+               err = devm_request_irq(iommu->dev, irq, rk_iommu_irq,
+                                      IRQF_SHARED, dev_name(dev), iommu);
+               if (err) {
+                       pm_runtime_disable(dev);
+                       goto err_remove_sysfs;
+               }
+       }
+
        return 0;
 err_remove_sysfs:
        iommu_device_sysfs_remove(&iommu->iommu);