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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>
This commit is contained in:
Mark Yao 2016-04-19 10:13:27 +08:00
parent 4e257d9eee
commit 2d90d47743
1 changed files with 49 additions and 21 deletions
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32
drivers/gpu/drm/rockchip/rockchip_drm_drv.c
View File

@ -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 @@ int rockchip_drm_dma_attach_device(struct drm_device *drm_dev,
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 @@ int rockchip_drm_dma_attach_device(struct drm_device *drm_dev,
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 void rockchip_drm_crtc_disable_vblank(struct drm_device *dev,
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;
@ -152,8 +160,10 @@ static int rockchip_drm_load(struct drm_device *drm_dev, unsigned long flags)
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,
mapping = arm_iommu_create_mapping(&platform_bus_type,
0x00000000,
SZ_2G);
if (IS_ERR(mapping)) {
ret = PTR_ERR(mapping);
@ -169,6 +179,7 @@ static int rockchip_drm_load(struct drm_device *drm_dev, unsigned long flags)
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);
@ -218,6 +229,7 @@ static int rockchip_drm_load(struct drm_device *drm_dev, unsigned long flags)
if (ret)
goto err_vblank_cleanup;
if (is_support_iommu)
arm_iommu_release_mapping(mapping);
return 0;
err_vblank_cleanup:
@ -227,8 +239,10 @@ err_kms_helper_poll_fini:
err_unbind:
component_unbind_all(dev, drm_dev);
err_detach_device:
if (is_support_iommu)
arm_iommu_detach_device(dev);
err_release_mapping:
if (is_support_iommu)
arm_iommu_release_mapping(mapping);
err_config_cleanup:
drm_mode_config_cleanup(drm_dev);
@ -244,6 +258,7 @@ static int rockchip_drm_unload(struct drm_device *drm_dev)
drm_vblank_cleanup(drm_dev);
drm_kms_helper_poll_fini(drm_dev);
component_unbind_all(dev, drm_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 @@ static int rockchip_drm_platform_probe(struct platform_device *pdev)
* 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 @@ static int rockchip_drm_platform_probe(struct platform_device *pdev)
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);
}