The patch adds Device Tree restrack support to drm/panel framework. As panels supports only Device Tree based lookup all panels can be converted to restrack. Signed-off-by: Andrzej Hajda <a.hajda@xxxxxxxxxxx> --- drivers/gpu/drm/drm_panel.c | 97 +++++++++++++++++++++++++++++++++++++++++++++ include/drm/drm_panel.h | 4 ++ include/linux/restrack.h | 2 + 3 files changed, 103 insertions(+) diff --git a/drivers/gpu/drm/drm_panel.c b/drivers/gpu/drm/drm_panel.c index 2ef988e..db04696 100644 --- a/drivers/gpu/drm/drm_panel.c +++ b/drivers/gpu/drm/drm_panel.c @@ -22,7 +22,9 @@ */ #include <linux/err.h> +#include <linux/of_graph.h> #include <linux/module.h> +#include <linux/restrack.h> #include <drm/drm_crtc.h> #include <drm/drm_panel.h> @@ -41,6 +43,7 @@ int drm_panel_add(struct drm_panel *panel) mutex_lock(&panel_lock); list_add_tail(&panel->list, &panel_list); mutex_unlock(&panel_lock); + restrack_up(RESTRACK_TYPE_DRM_PANEL, panel->dev->of_node, panel); return 0; } @@ -48,6 +51,7 @@ EXPORT_SYMBOL(drm_panel_add); void drm_panel_remove(struct drm_panel *panel) { + restrack_down(RESTRACK_TYPE_DRM_PANEL, panel->dev->of_node, panel); mutex_lock(&panel_lock); list_del_init(&panel->list); mutex_unlock(&panel_lock); @@ -93,6 +97,99 @@ struct drm_panel *of_drm_find_panel(struct device_node *np) return NULL; } EXPORT_SYMBOL(of_drm_find_panel); + +struct drm_panel_restrack_desc { + struct drm_panel **ptr; + const char *name; + int port; + struct restrack_desc desc; +}; + +static int drm_panel_restrack_init(struct device *dev, + struct restrack_desc *desc) +{ + struct drm_panel_restrack_desc *rd = restrack_desc_to_rd(rd, desc); + struct device_node *np; + + if (rd->name) { + desc->if_id = of_parse_phandle(dev->of_node, rd->name, 0); + goto end; + } + + np = NULL; + while ((np = of_graph_get_next_endpoint(dev->of_node, np))) { + struct of_endpoint ep; + + of_graph_parse_endpoint(np, &ep); + if (ep.port != rd->port) + continue; + desc->if_id = of_graph_get_remote_port_parent(np); + of_node_put(np); + break; + } + +end: + return desc->if_id ? 0 : -EINVAL; +} + +static void drm_panel_restrack_destroy(struct device *dev, + struct restrack_desc *desc) +{ + struct drm_panel_restrack_desc *rd = restrack_desc_to_rd(rd, desc); + + of_node_put(desc->if_id); + kfree(rd); +} + +static int drm_panel_restrack_ifup(struct device *dev, + struct restrack_desc *desc, void *data) +{ + struct drm_panel_restrack_desc *rd = restrack_desc_to_rd(rd, desc); + + *rd->ptr = data; + return PTR_ERR_OR_ZERO(*rd->ptr); +} + +static void drm_panel_restrack_ifdown(struct device *dev, + struct restrack_desc *desc, void *data) +{ + struct drm_panel_restrack_desc *rd = restrack_desc_to_rd(rd, desc); + + *rd->ptr = ERR_PTR(-EPROBE_DEFER); +} + +static const struct restrack_ops drm_panel_restrack_ops = { + .if_type = RESTRACK_TYPE_DRM_PANEL, + .init = drm_panel_restrack_init, + .destroy = drm_panel_restrack_destroy, + .if_up = drm_panel_restrack_ifup, + .if_down = drm_panel_restrack_ifdown, +}; + +/** + * drm_panel_restrack_desc - drm_panel resource descriptor allocator + * @panel: pointer to variable which will be set to drm_panel handle + * @prop_name: property name containing phandle to the panel node, it can be + * NULL if driver uses only of_graph + * @port: of_graph port number in case of_graph is used + * + * The function creates resource description for panel, which shall be used by + * *restrack_register functions. + */ +struct restrack_desc *drm_panel_restrack_desc(struct drm_panel **panel, + const char *prop_name, int port) +{ + struct drm_panel_restrack_desc *rd; + + RESTRACK_DESC_ALLOC(rd, drm_panel_restrack_ops, panel, prop_name); + if (!rd) + return ERR_PTR(-ENOMEM); + + rd->port = port; + return &rd->desc; +} +EXPORT_SYMBOL_GPL(drm_panel_restrack_desc); + #endif MODULE_AUTHOR("Thierry Reding <treding@xxxxxxxxxx>"); diff --git a/include/drm/drm_panel.h b/include/drm/drm_panel.h index 1fbcc96..46eb88e 100644 --- a/include/drm/drm_panel.h +++ b/include/drm/drm_panel.h @@ -130,6 +130,10 @@ int drm_panel_detach(struct drm_panel *panel); #ifdef CONFIG_OF struct drm_panel *of_drm_find_panel(struct device_node *np); + +struct restrack_desc; +struct restrack_desc *drm_panel_restrack_desc(struct drm_panel **panel, + const char *prop_name, int port); #else static inline struct drm_panel *of_drm_find_panel(struct device_node *np) { diff --git a/include/linux/restrack.h b/include/linux/restrack.h index 6cf8144f..af5b617 100644 --- a/include/linux/restrack.h +++ b/include/linux/restrack.h @@ -3,6 +3,8 @@ #include <linux/track.h> +#define RESTRACK_TYPE_DRM_PANEL 1 + struct device; struct restrack_ctx; struct restrack_desc; -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html