Re: [PATCH 2/3] drm/panfrost: Support cache-coherent integrations

---
  drivers/gpu/drm/panfrost/panfrost_device.h | 1 +
  drivers/gpu/drm/panfrost/panfrost_drv.c    | 2 ++
  drivers/gpu/drm/panfrost/panfrost_gem.c    | 2 ++
  drivers/gpu/drm/panfrost/panfrost_mmu.c    | 1 +
  4 files changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/panfrost/panfrost_device.h b/drivers/gpu/drm/panfrost/panfrost_device.h
index c30c719a8059..b31f45315e96 100644
--- a/drivers/gpu/drm/panfrost/panfrost_device.h
+++ b/drivers/gpu/drm/panfrost/panfrost_device.h

@@ -84,6 +84,7 @@ struct panfrost_device {
  	/* pm_domains for devices with more than one. */
  	struct device *pm_domain_devs[MAX_PM_DOMAINS];
  	struct device_link *pm_domain_links[MAX_PM_DOMAINS];
+	bool coherent;
  
  	struct panfrost_features features;
  	const struct panfrost_compatible *comp;

diff --git a/drivers/gpu/drm/panfrost/panfrost_drv.c b/drivers/gpu/drm/panfrost/panfrost_drv.c
index ada51df9a7a3..2a6f2f716b2f 100644
--- a/drivers/gpu/drm/panfrost/panfrost_drv.c
+++ b/drivers/gpu/drm/panfrost/panfrost_drv.c

@@ -588,6 +588,8 @@ static int panfrost_probe(struct platform_device *pdev)
  	if (!pfdev->comp)
  		return -ENODEV;
  
+	pfdev->coherent = device_get_dma_attr(&pdev->dev) == DEV_DMA_COHERENT;
+
  	/* Allocate and initialze the DRM device. */
  	ddev = drm_dev_alloc(&panfrost_drm_driver, &pdev->dev);
  	if (IS_ERR(ddev))

diff --git a/drivers/gpu/drm/panfrost/panfrost_gem.c b/drivers/gpu/drm/panfrost/panfrost_gem.c
index 33355dd302f1..cdf1a8754eba 100644
--- a/drivers/gpu/drm/panfrost/panfrost_gem.c
+++ b/drivers/gpu/drm/panfrost/panfrost_gem.c

@@ -220,6 +220,7 @@ static const struct drm_gem_object_funcs panfrost_gem_funcs = {
   */
  struct drm_gem_object *panfrost_gem_create_object(struct drm_device *dev, size_t size)
  {
+	struct panfrost_device *pfdev = dev->dev_private;
  	struct panfrost_gem_object *obj;
  
  	obj = kzalloc(sizeof(*obj), GFP_KERNEL);

@@ -229,6 +230,7 @@ struct drm_gem_object *panfrost_gem_create_object(struct drm_device *dev, size_t
  	INIT_LIST_HEAD(&obj->mappings.list);
  	mutex_init(&obj->mappings.lock);
  	obj->base.base.funcs = &panfrost_gem_funcs;
+	obj->base.map_cached = pfdev->coherent;
  
  	return &obj->base.base;
  }

diff --git a/drivers/gpu/drm/panfrost/panfrost_mmu.c b/drivers/gpu/drm/panfrost/panfrost_mmu.c
index e8f7b11352d2..8852fd378f7a 100644
--- a/drivers/gpu/drm/panfrost/panfrost_mmu.c
+++ b/drivers/gpu/drm/panfrost/panfrost_mmu.c

@@ -371,6 +371,7 @@ int panfrost_mmu_pgtable_alloc(struct panfrost_file_priv *priv)
  		.pgsize_bitmap	= SZ_4K | SZ_2M,
  		.ias		= FIELD_GET(0xff, pfdev->features.mmu_features),
  		.oas		= FIELD_GET(0xff00, pfdev->features.mmu_features),
+		.coherent_walk	= pfdev->coherent,
  		.tlb		= &mmu_tlb_ops,
  		.iommu_dev	= pfdev->dev,
  	};