Although going full "dma-coherent" ends badly due to GEM objects still being forcibly mapped non-cacheable, we can at least take advantage of Juno's ACE-lite integration to skip cache maintenance for pagetables. CC: Rob Herring <robh@xxxxxxxxxx> CC: Tomeu Vizoso <tomeu.vizoso@xxxxxxxxxxxxx> Signed-off-by: Robin Murphy <robin.murphy@xxxxxxx> --- This isn't really meant as a series, I'm just sending it together with patch #1 for context. drivers/gpu/drm/panfrost/panfrost_mmu.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/gpu/drm/panfrost/panfrost_mmu.c b/drivers/gpu/drm/panfrost/panfrost_mmu.c index bdd990568476..560439f63277 100644 --- a/drivers/gpu/drm/panfrost/panfrost_mmu.c +++ b/drivers/gpu/drm/panfrost/panfrost_mmu.c @@ -365,6 +365,9 @@ int panfrost_mmu_pgtable_alloc(struct panfrost_file_priv *priv) .iommu_dev = pfdev->dev, }; + if (of_device_is_compatible(pfdev->dev->of_node, "arm,juno-mali")) + pfdev->mmu->pgtbl_cfg.coherent_walk = true; + mmu->pgtbl_ops = alloc_io_pgtable_ops(ARM_MALI_LPAE, &mmu->pgtbl_cfg, priv); if (!mmu->pgtbl_ops) -- 2.21.0.dirty
