From 2d90d477430d3a20df74f2d11c21378e64e1d508 Mon Sep 17 00:00:00 2001 From: Mark Yao Date: Tue, 19 Apr 2016 10:13:27 +0800 Subject: [PATCH] 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 --- drivers/gpu/drm/rockchip/rockchip_drm_drv.c | 66 +++++++++++++++------ 1 file changed, 47 insertions(+), 19 deletions(-) diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_drv.c b/drivers/gpu/drm/rockchip/rockchip_drm_drv.c index 1e2d88bdd9f7..399adf3c4224 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 @@ 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; @@ -152,23 +160,26 @@ static int rockchip_drm_load(struct drm_device *drm_dev, unsigned long flags) 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; + 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)); + dma_set_max_seg_size(dev, DMA_BIT_MASK(32)); - ret = arm_iommu_attach_device(dev, mapping); - if (ret) - goto err_release_mapping; + 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); @@ -218,7 +229,8 @@ static int rockchip_drm_load(struct drm_device *drm_dev, unsigned long flags) 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_kms_helper_poll_fini: 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 @@ 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); - 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 @@ 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); } -- 2.30.2