diff options
Diffstat (limited to 'drivers/iommu')
| -rw-r--r-- | drivers/iommu/arm-smmu.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c index 080af0326816..a2b1ca55b73e 100644 --- a/drivers/iommu/arm-smmu.c +++ b/drivers/iommu/arm-smmu.c @@ -123,7 +123,7 @@ static inline int arm_smmu_rpm_get(struct arm_smmu_device *smmu) static inline void arm_smmu_rpm_put(struct arm_smmu_device *smmu) { if (pm_runtime_enabled(smmu->dev)) - pm_runtime_put(smmu->dev); + pm_runtime_put_autosuspend(smmu->dev); } static struct arm_smmu_domain *to_smmu_domain(struct iommu_domain *dom) @@ -1167,6 +1167,20 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev) /* Looks ok, so add the device to the domain */ ret = arm_smmu_domain_add_master(smmu_domain, fwspec); + /* + * Setup an autosuspend delay to avoid bouncing runpm state. + * Otherwise, if a driver for a suspended consumer device + * unmaps buffers, it will runpm resume/suspend for each one. + * + * For example, when used by a GPU device, when an application + * or game exits, it can trigger unmapping 100s or 1000s of + * buffers. With a runpm cycle for each buffer, that adds up + * to 5-10sec worth of reprogramming the context bank, while + * the system appears to be locked up to the user. + */ + pm_runtime_set_autosuspend_delay(smmu->dev, 20); + pm_runtime_use_autosuspend(smmu->dev); + rpm_put: arm_smmu_rpm_put(smmu); return ret; |