diff options
Diffstat (limited to 'drivers/gpu/drm/sun4i/sun4i_drv.c')
| -rw-r--r-- | drivers/gpu/drm/sun4i/sun4i_drv.c | 91 |
1 files changed, 77 insertions, 14 deletions
diff --git a/drivers/gpu/drm/sun4i/sun4i_drv.c b/drivers/gpu/drm/sun4i/sun4i_drv.c index ace59651892f..a2012638d5f7 100644 --- a/drivers/gpu/drm/sun4i/sun4i_drv.c +++ b/drivers/gpu/drm/sun4i/sun4i_drv.c @@ -106,11 +106,6 @@ static int sun4i_drv_bind(struct device *dev) goto free_drm; } - /* drm_vblank_init calls kcalloc, which can fail */ - ret = drm_vblank_init(drm, 1); - if (ret) - goto free_mem_region; - drm_mode_config_init(drm); ret = component_bind_all(drm->dev, drm); @@ -119,6 +114,11 @@ static int sun4i_drv_bind(struct device *dev) goto cleanup_mode_config; } + /* drm_vblank_init calls kcalloc, which can fail */ + ret = drm_vblank_init(drm, drm->mode_config.num_crtc); + if (ret) + goto free_mem_region; + drm->irq_enabled = true; /* Remove early framebuffers (ie. simplefb) */ @@ -200,11 +200,39 @@ static int compare_of(struct device *dev, void *data) return dev->of_node == data; } +/* + * The encoder drivers use drm_of_find_possible_crtcs to get upstream + * crtcs from the device tree using of_graph. For the results to be + * correct, encoders must be probed/bound after _all_ crtcs have been + * created. The existing code uses a depth first recursive traversal + * of the of_graph, which means the encoders downstream of the TCON + * get add right after the first TCON. The second TCON or CRTC will + * never be properly associated with encoders connected to it. + * + * Also, in a dual display pipeline setup, both frontends can feed + * either backend, and both backends can feed either TCON, we want + * all components of the same type to be added before the next type + * in the pipeline. Fortunately, the pipelines are perfectly symmetric, + * i.e. components of the same type are at the same depth when counted + * from the frontend. The only exception is the third pipeline in + * the A80 SoC, which we do not support anyway. + * + * Hence we can use a breadth first search traversal order to add + * components. We do not need to check for duplicates. The component + * matching system handles this for us. + */ +struct endpoint_list { + struct device_node *node; + struct list_head list; +}; + static int sun4i_drv_add_endpoints(struct device *dev, + struct list_head *endpoints, struct component_match **match, struct device_node *node) { struct device_node *port, *ep, *remote; + struct endpoint_list *endpoint; int count = 0; /* @@ -264,10 +292,15 @@ static int sun4i_drv_add_endpoints(struct device *dev, } } - /* Walk down our tree */ - count += sun4i_drv_add_endpoints(dev, match, remote); + /* Add downstream nodes to the queue */ + endpoint = kzalloc(sizeof(*endpoint), GFP_KERNEL); + if (!endpoint) { + of_node_put(remote); + return -ENOMEM; + } - of_node_put(remote); + endpoint->node = remote; + list_add_tail(&endpoint->list, endpoints); } return count; @@ -277,7 +310,9 @@ static int sun4i_drv_probe(struct platform_device *pdev) { struct component_match *match = NULL; struct device_node *np = pdev->dev.of_node; - int i, count = 0; + struct endpoint_list *endpoint, *endpoint_temp; + int i, ret, count = 0; + LIST_HEAD(endpoints); for (i = 0;; i++) { struct device_node *pipeline = of_parse_phandle(np, @@ -286,12 +321,31 @@ static int sun4i_drv_probe(struct platform_device *pdev) if (!pipeline) break; - count += sun4i_drv_add_endpoints(&pdev->dev, &match, - pipeline); - of_node_put(pipeline); + endpoint = kzalloc(sizeof(*endpoint), GFP_KERNEL); + if (!endpoint) { + ret = -ENOMEM; + goto err_free_endpoints; + } - DRM_DEBUG_DRIVER("Queued %d outputs on pipeline %d\n", - count, i); + endpoint->node = pipeline; + list_add_tail(&endpoint->list, &endpoints); + } + + list_for_each_entry_safe(endpoint, endpoint_temp, &endpoints, list) { + /* process this endpoint */ + ret = sun4i_drv_add_endpoints(&pdev->dev, &endpoints, &match, + endpoint->node); + + /* sun4i_drv_add_endpoints can fail to allocate memory */ + if (ret < 0) + goto err_free_endpoints; + + count += ret; + + /* delete and cleanup the current entry */ + list_del(&endpoint->list); + of_node_put(endpoint->node); + kfree(endpoint); } if (count) @@ -300,6 +354,15 @@ static int sun4i_drv_probe(struct platform_device *pdev) match); else return 0; + +err_free_endpoints: + list_for_each_entry_safe(endpoint, endpoint_temp, &endpoints, list) { + list_del(&endpoint->list); + of_node_put(endpoint->node); + kfree(endpoint); + } + + return ret; } static int sun4i_drv_remove(struct platform_device *pdev) |