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@kernel.org CC: Tomeu Vizoso tomeu.vizoso@collabora.com Signed-off-by: Robin Murphy robin.murphy@arm.com ---
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)