diff options
Diffstat (limited to 'drivers/gpu/drm/omapdrm/dss/base.c')
| -rw-r--r-- | drivers/gpu/drm/omapdrm/dss/base.c | 217 |
1 files changed, 205 insertions, 12 deletions
diff --git a/drivers/gpu/drm/omapdrm/dss/base.c b/drivers/gpu/drm/omapdrm/dss/base.c index 99e8cb8dc65b..472f56e3de70 100644 --- a/drivers/gpu/drm/omapdrm/dss/base.c +++ b/drivers/gpu/drm/omapdrm/dss/base.c @@ -14,24 +14,17 @@ */ #include <linux/kernel.h> +#include <linux/list.h> #include <linux/module.h> +#include <linux/mutex.h> #include <linux/of.h> #include <linux/of_graph.h> -#include <linux/list.h> #include "dss.h" #include "omapdss.h" static struct dss_device *dss_device; -static struct list_head omapdss_comp_list; - -struct omapdss_comp_node { - struct list_head list; - struct device_node *node; - bool dss_core_component; -}; - struct dss_device *omapdss_get_dss(void) { return dss_device; @@ -56,6 +49,208 @@ const struct dispc_ops *dispc_get_ops(struct dss_device *dss) } EXPORT_SYMBOL(dispc_get_ops); + +/* ----------------------------------------------------------------------------- + * OMAP DSS Devices Handling + */ + +static LIST_HEAD(omapdss_devices_list); +static DEFINE_MUTEX(omapdss_devices_lock); + +void omapdss_device_register(struct omap_dss_device *dssdev) +{ + mutex_lock(&omapdss_devices_lock); + list_add_tail(&dssdev->list, &omapdss_devices_list); + mutex_unlock(&omapdss_devices_lock); +} +EXPORT_SYMBOL_GPL(omapdss_device_register); + +void omapdss_device_unregister(struct omap_dss_device *dssdev) +{ + mutex_lock(&omapdss_devices_lock); + list_del(&dssdev->list); + mutex_unlock(&omapdss_devices_lock); +} +EXPORT_SYMBOL_GPL(omapdss_device_unregister); + +static bool omapdss_device_is_registered(struct device_node *node) +{ + struct omap_dss_device *dssdev; + bool found = false; + + mutex_lock(&omapdss_devices_lock); + + list_for_each_entry(dssdev, &omapdss_devices_list, list) { + if (dssdev->dev->of_node == node) { + found = true; + break; + } + } + + mutex_unlock(&omapdss_devices_lock); + return found; +} + +struct omap_dss_device *omapdss_device_get(struct omap_dss_device *dssdev) +{ + if (!try_module_get(dssdev->owner)) + return NULL; + + if (get_device(dssdev->dev) == NULL) { + module_put(dssdev->owner); + return NULL; + } + + return dssdev; +} +EXPORT_SYMBOL(omapdss_device_get); + +void omapdss_device_put(struct omap_dss_device *dssdev) +{ + put_device(dssdev->dev); + module_put(dssdev->owner); +} +EXPORT_SYMBOL(omapdss_device_put); + +struct omap_dss_device *omapdss_find_device_by_port(struct device_node *src, + unsigned int port) +{ + struct omap_dss_device *dssdev; + + list_for_each_entry(dssdev, &omapdss_devices_list, list) { + if (dssdev->dev->of_node == src && dssdev->of_ports & BIT(port)) + return omapdss_device_get(dssdev); + } + + return NULL; +} + +/* + * Search for the next device starting at @from. The type argument specfies + * which device types to consider when searching. Searching for multiple types + * is supported by and'ing their type flags. Release the reference to the @from + * device, and acquire a reference to the returned device if found. + */ +struct omap_dss_device *omapdss_device_get_next(struct omap_dss_device *from, + enum omap_dss_device_type type) +{ + struct omap_dss_device *dssdev; + struct list_head *list; + + mutex_lock(&omapdss_devices_lock); + + if (list_empty(&omapdss_devices_list)) { + dssdev = NULL; + goto done; + } + + /* + * Start from the from entry if given or from omapdss_devices_list + * otherwise. + */ + list = from ? &from->list : &omapdss_devices_list; + + list_for_each_entry(dssdev, list, list) { + /* + * Stop if we reach the omapdss_devices_list, that's the end of + * the list. + */ + if (&dssdev->list == &omapdss_devices_list) { + dssdev = NULL; + goto done; + } + + /* + * Accept display entities if the display type is requested, + * and output entities if the output type is requested. + */ + if ((type & OMAP_DSS_DEVICE_TYPE_DISPLAY) && + !dssdev->output_type) + goto done; + if ((type & OMAP_DSS_DEVICE_TYPE_OUTPUT) && dssdev->id && + dssdev->next) + goto done; + } + + dssdev = NULL; + +done: + if (from) + omapdss_device_put(from); + if (dssdev) + omapdss_device_get(dssdev); + + mutex_unlock(&omapdss_devices_lock); + return dssdev; +} +EXPORT_SYMBOL(omapdss_device_get_next); + +int omapdss_device_connect(struct dss_device *dss, + struct omap_dss_device *src, + struct omap_dss_device *dst) +{ + int ret; + + dev_dbg(dst->dev, "connect\n"); + + if (omapdss_device_is_connected(dst)) + return -EBUSY; + + dst->dss = dss; + + ret = dst->ops->connect(src, dst); + if (ret < 0) { + dst->dss = NULL; + return ret; + } + + if (src) { + WARN_ON(src->dst); + dst->src = src; + src->dst = dst; + } + + return 0; +} +EXPORT_SYMBOL_GPL(omapdss_device_connect); + +void omapdss_device_disconnect(struct omap_dss_device *src, + struct omap_dss_device *dst) +{ + dev_dbg(dst->dev, "disconnect\n"); + + if (!dst->id && !omapdss_device_is_connected(dst)) { + WARN_ON(dst->output_type); + return; + } + + if (src) { + if (WARN_ON(dst != src->dst)) + return; + + dst->src = NULL; + src->dst = NULL; + } + + WARN_ON(dst->state != OMAP_DSS_DISPLAY_DISABLED); + + dst->ops->disconnect(src, dst); + dst->dss = NULL; +} +EXPORT_SYMBOL_GPL(omapdss_device_disconnect); + +/* ----------------------------------------------------------------------------- + * Components Handling + */ + +static struct list_head omapdss_comp_list; + +struct omapdss_comp_node { + struct list_head list; + struct device_node *node; + bool dss_core_component; +}; + static bool omapdss_list_contains(const struct device_node *node) { struct omapdss_comp_node *comp; @@ -130,9 +325,7 @@ 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)) + if (omapdss_device_is_registered(comp->node)) return true; return false; |