From: Peter Ujfalusi peter.ujfalusi@ti.com
When omapdss is loaded (all core components are in place) create a list of devices used in the display graph. This list later can be used by omapdrm via the omapdss_stack_is_ready() function to check that these components are loaded. Based on this information, omapdrm can defer probe in case when the omapdss stack is not ready yet.
Signed-off-by: Peter Ujfalusi peter.ujfalusi@ti.com Signed-off-by: Tomi Valkeinen tomi.valkeinen@ti.com --- drivers/gpu/drm/omapdrm/dss/base.c | 107 ++++++++++++++++++++++++++++++++++ drivers/gpu/drm/omapdrm/dss/dss.c | 1 + drivers/gpu/drm/omapdrm/dss/omapdss.h | 3 + 3 files changed, 111 insertions(+)
diff --git a/drivers/gpu/drm/omapdrm/dss/base.c b/drivers/gpu/drm/omapdrm/dss/base.c index 7dd447e6c4d7..13e91faaf7a6 100644 --- a/drivers/gpu/drm/omapdrm/dss/base.c +++ b/drivers/gpu/drm/omapdrm/dss/base.c @@ -1,9 +1,21 @@ #include <linux/kernel.h> #include <linux/module.h> +#include <linux/of.h> +#include <linux/of_graph.h> +#include <linux/list.h> +#include "omapdss.h"
static bool dss_initialized; static const struct dispc_ops *ops;
+static struct list_head omapdss_comp_list; + +struct omapdss_comp_node { + struct list_head list; + struct device_node *node; + bool dss_core_component; +}; + void omapdss_set_is_initialized(bool set) { dss_initialized = set; @@ -28,6 +40,101 @@ const struct dispc_ops *dispc_get_ops(void) } EXPORT_SYMBOL(dispc_get_ops);
+static bool omapdss_list_contains(const struct device_node *node) +{ + struct omapdss_comp_node *comp; + + list_for_each_entry(comp, &omapdss_comp_list, list) { + if (comp->node == node) + return true; + } + + return false; +} + +static void omapdss_walk_device(struct device *dev, struct device_node *node, + bool dss_core) +{ + struct device_node *n; + struct omapdss_comp_node *comp = devm_kzalloc(dev, sizeof(*comp), + GFP_KERNEL); + + if (comp) { + comp->node = node; + comp->dss_core_component = dss_core; + list_add(&comp->list, &omapdss_comp_list); + } + + /* + * of_graph_get_remote_port_parent() prints an error if there is no + * port/ports node. To avoid that, check first that there's the node. + */ + n = of_get_child_by_name(node, "ports"); + if (!n) + n = of_get_child_by_name(node, "port"); + if (!n) + return; + + of_node_put(n); + + n = NULL; + while ((n = of_graph_get_next_endpoint(node, n)) != NULL) { + struct device_node *pn = of_graph_get_remote_port_parent(n); + + if (!pn) + continue; + + if (!of_device_is_available(pn) || omapdss_list_contains(pn)) { + of_node_put(pn); + continue; + } + + omapdss_walk_device(dev, pn, false); + } +} + +void omapdss_gather_components(struct device *dev) +{ + struct device_node *child; + + INIT_LIST_HEAD(&omapdss_comp_list); + + omapdss_walk_device(dev, dev->of_node, true); + + for_each_available_child_of_node(dev->of_node, child) { + if (!of_find_property(child, "compatible", NULL)) + continue; + + omapdss_walk_device(dev, child, true); + } +} +EXPORT_SYMBOL(omapdss_gather_components); + +static bool omapdss_component_is_loaded(struct omapdss_comp_node *comp) +{ + if (comp->dss_core_component) + return true; + if (omapdss_component_is_display(comp->node)) + return true; + if (omapdss_component_is_output(comp->node)) + return true; + + return false; +} + +bool omapdss_stack_is_ready(void) +{ + struct omapdss_comp_node *comp; + + list_for_each_entry(comp, &omapdss_comp_list, list) { + if (!omapdss_component_is_loaded(comp)) + return false; + } + + return true; +} +EXPORT_SYMBOL(omapdss_stack_is_ready); + MODULE_AUTHOR("Tomi Valkeinen tomi.valkeinen@ti.com"); MODULE_DESCRIPTION("OMAP Display Subsystem Base"); MODULE_LICENSE("GPL v2"); diff --git a/drivers/gpu/drm/omapdrm/dss/dss.c b/drivers/gpu/drm/omapdrm/dss/dss.c index e647cebe7d9d..de81166e0fe4 100644 --- a/drivers/gpu/drm/omapdrm/dss/dss.c +++ b/drivers/gpu/drm/omapdrm/dss/dss.c @@ -1259,6 +1259,7 @@ static int dss_bind(struct device *dev)
pm_set_vt_switch(0);
+ omapdss_gather_components(dev); omapdss_set_is_initialized(true);
return 0; diff --git a/drivers/gpu/drm/omapdrm/dss/omapdss.h b/drivers/gpu/drm/omapdrm/dss/omapdss.h index fa34b68a676b..74cba1ef7ee9 100644 --- a/drivers/gpu/drm/omapdrm/dss/omapdss.h +++ b/drivers/gpu/drm/omapdrm/dss/omapdss.h @@ -942,4 +942,7 @@ const struct dispc_ops *dispc_get_ops(void); bool omapdss_component_is_display(struct device_node *node); bool omapdss_component_is_output(struct device_node *node);
+bool omapdss_stack_is_ready(void); +void omapdss_gather_components(struct device *dev); + #endif /* __OMAP_DRM_DSS_H */