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drm/msm: pm runtime support for iommu

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In particular, attach() and unmap() need pm-runtime get/put to ensure
iommu clks are enabled.

Signed-off-by: Rob Clark <robdclark@gmail.com>
This commit is contained in:
Rob Clark 2017-02-15 16:00:25 -05:00
parent f90000492e
commit cc69272673
1 changed files with 14 additions and 1 deletions
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15
drivers/gpu/drm/msm/msm_iommu.c
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@ -38,14 +38,23 @@ static int msm_iommu_attach(struct msm_mmu *mmu, const char * const *names,
int cnt)
{
struct msm_iommu *iommu = to_msm_iommu(mmu);
return iommu_attach_device(iommu->domain, mmu->dev);
int ret;
pm_runtime_get_sync(mmu->dev);
ret = iommu_attach_device(iommu->domain, mmu->dev);
pm_runtime_put_sync(mmu->dev);
return ret;
}
static void msm_iommu_detach(struct msm_mmu *mmu, const char * const *names,
int cnt)
{
struct msm_iommu *iommu = to_msm_iommu(mmu);
pm_runtime_get_sync(mmu->dev);
iommu_detach_device(iommu->domain, mmu->dev);
pm_runtime_put_sync(mmu->dev);
}
static int msm_iommu_map(struct msm_mmu *mmu, uint64_t iova,
@ -54,7 +63,9 @@ static int msm_iommu_map(struct msm_mmu *mmu, uint64_t iova,
struct msm_iommu *iommu = to_msm_iommu(mmu);
size_t ret;
// pm_runtime_get_sync(mmu->dev);
ret = iommu_map_sg(iommu->domain, iova, sgt->sgl, sgt->nents, prot);
// pm_runtime_put_sync(mmu->dev);
WARN_ON(ret < 0);
return (ret == len) ? 0 : -EINVAL;
@ -65,7 +76,9 @@ static int msm_iommu_unmap(struct msm_mmu *mmu, uint64_t iova,
{
struct msm_iommu *iommu = to_msm_iommu(mmu);
pm_runtime_get_sync(mmu->dev);
iommu_unmap(iommu->domain, iova, len);
pm_runtime_put_sync(mmu->dev);
return 0;
}