drm/rockchip: support non-iommu buffer path
Some rockchip vop not support iommu, need use non-iommu
buffer for it. And if we get iommu issues, we can compare
the issues with non-iommu path, that would help the debug.
Signed-off-by: Mark Yao <mark.yao@rock-chips.com>
diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
index 1e2d88b..399adf3 100644
--- a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
+++ b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c
@@ -36,6 +36,8 @@
#define DRIVER_MAJOR 1
#define DRIVER_MINOR 0
+static bool is_support_iommu = true;
+
/*
* Attach a (component) device to the shared drm dma mapping from master drm
* device. This is used by the VOPs to map GEM buffers to a common DMA
@@ -47,6 +49,9 @@
struct dma_iommu_mapping *mapping = drm_dev->dev->archdata.mapping;
int ret;
+ if (!is_support_iommu)
+ return 0;
+
ret = dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
if (ret)
return ret;
@@ -59,6 +64,9 @@
void rockchip_drm_dma_detach_device(struct drm_device *drm_dev,
struct device *dev)
{
+ if (!is_support_iommu)
+ return;
+
arm_iommu_detach_device(dev);
}
@@ -127,7 +135,7 @@
static int rockchip_drm_load(struct drm_device *drm_dev, unsigned long flags)
{
struct rockchip_drm_private *private;
- struct dma_iommu_mapping *mapping;
+ struct dma_iommu_mapping *mapping = NULL;
struct device *dev = drm_dev->dev;
struct drm_connector *connector;
int ret;
@@ -152,24 +160,27 @@
goto err_config_cleanup;
}
- /* TODO(djkurtz): fetch the mapping start/size from somewhere */
- mapping = arm_iommu_create_mapping(&platform_bus_type, 0x00000000,
- SZ_2G);
- if (IS_ERR(mapping)) {
- ret = PTR_ERR(mapping);
- goto err_config_cleanup;
+ if (is_support_iommu) {
+ /* TODO(djkurtz): fetch the mapping start/size from somewhere */
+ mapping = arm_iommu_create_mapping(&platform_bus_type,
+ 0x00000000,
+ SZ_2G);
+ if (IS_ERR(mapping)) {
+ ret = PTR_ERR(mapping);
+ goto err_config_cleanup;
+ }
+
+ ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
+ if (ret)
+ goto err_release_mapping;
+
+ dma_set_max_seg_size(dev, DMA_BIT_MASK(32));
+
+ ret = arm_iommu_attach_device(dev, mapping);
+ if (ret)
+ goto err_release_mapping;
}
- ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(32));
- if (ret)
- goto err_release_mapping;
-
- dma_set_max_seg_size(dev, DMA_BIT_MASK(32));
-
- ret = arm_iommu_attach_device(dev, mapping);
- if (ret)
- goto err_release_mapping;
-
/* Try to bind all sub drivers. */
ret = component_bind_all(dev, drm_dev);
if (ret)
@@ -218,7 +229,8 @@
if (ret)
goto err_vblank_cleanup;
- arm_iommu_release_mapping(mapping);
+ if (is_support_iommu)
+ arm_iommu_release_mapping(mapping);
return 0;
err_vblank_cleanup:
drm_vblank_cleanup(drm_dev);
@@ -227,9 +239,11 @@
err_unbind:
component_unbind_all(dev, drm_dev);
err_detach_device:
- arm_iommu_detach_device(dev);
+ if (is_support_iommu)
+ arm_iommu_detach_device(dev);
err_release_mapping:
- arm_iommu_release_mapping(mapping);
+ if (is_support_iommu)
+ arm_iommu_release_mapping(mapping);
err_config_cleanup:
drm_mode_config_cleanup(drm_dev);
drm_dev->dev_private = NULL;
@@ -244,7 +258,8 @@
drm_vblank_cleanup(drm_dev);
drm_kms_helper_poll_fini(drm_dev);
component_unbind_all(dev, drm_dev);
- arm_iommu_detach_device(dev);
+ if (is_support_iommu)
+ arm_iommu_detach_device(dev);
drm_mode_config_cleanup(drm_dev);
drm_dev->dev_private = NULL;
@@ -488,6 +503,8 @@
* works as expected.
*/
for (i = 0;; i++) {
+ struct device_node *iommu;
+
port = of_parse_phandle(np, "ports", i);
if (!port)
break;
@@ -497,6 +514,17 @@
continue;
}
+ iommu = of_parse_phandle(port->parent, "iommus", 0);
+ if (!iommu || !of_device_is_available(iommu->parent)) {
+ dev_dbg(dev, "no iommu attached for %s, using non-iommu buffers\n",
+ port->parent->full_name);
+ /*
+ * if there is a crtc not support iommu, force set all
+ * crtc use non-iommu buffer.
+ */
+ is_support_iommu = false;
+ }
+
component_match_add(dev, &match, compare_of, port->parent);
of_node_put(port);
}