drm: add of_graph endpoint helper to find possible CRTCs

Add a helper to allow encoders to find their possible CRTCs from the OF graph without having to re-implement this functionality. We add a device_node to drm_crtc which corresponds with the port node in the DT description of the CRTC device. We can then scan the DRM device list for CRTCs to find their index, matching the appropriate CRTC using the port device_node, thus building up the possible CRTC mask. Reviewed-by: Rob Clark <robdclark@gmail.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

drm: add of_graph endpoint helper to find possible CRTCs
Add a helper to allow encoders to find their possible CRTCs from the OF graph without having to re-implement this functionality. We add a device_node to drm_crtc which corresponds with the port node in the DT description of the CRTC device. We can then scan the DRM device list for CRTCs to find their index, matching the appropriate CRTC using the port device_node, thus building up the possible CRTC mask. Reviewed-by: Rob Clark <robdclark@gmail.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Russell King
1 parent 4c834452aa
Showing 4 changed files with 88 additions and 0 deletions Side-by-side Diff
drivers/gpu/drm/Makefile
drivers/gpu/drm/drm_of.c
include/drm/drm_crtc.h
include/drm/drm_of.h
@@ -20,6 +20,7 @@
 drm-$(CONFIG_DRM_GEM_CMA_HELPER) += drm_gem_cma_helper.o
 drm-$(CONFIG_PCI) += ati_pcigart.o
 drm-$(CONFIG_DRM_PANEL) += drm_panel.o
+drm-$(CONFIG_OF) += drm_of.o
  
 drm-usb-y   := drm_usb.o
  
+#include <linux/export.h>
+#include <linux/list.h>
+#include <linux/of_graph.h>
+#include <drm/drmP.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_of.h>
+
+/**
+ * drm_crtc_port_mask - find the mask of a registered CRTC by port OF node
+ * @dev: DRM device
+ * @port: port OF node
+ *
+ * Given a port OF node, return the possible mask of the corresponding
+ * CRTC within a device's list of CRTCs.  Returns zero if not found.
+ */
+static uint32_t drm_crtc_port_mask(struct drm_device *dev,
+				   struct device_node *port)
+{
+	unsigned int index = 0;
+	struct drm_crtc *tmp;
+
+	list_for_each_entry(tmp, &dev->mode_config.crtc_list, head) {
+		if (tmp->port == port)
+			return 1 << index;
+
+		index++;
+	}
+
+	return 0;
+}
+
+/**
+ * drm_of_find_possible_crtcs - find the possible CRTCs for an encoder port
+ * @dev: DRM device
+ * @port: encoder port to scan for endpoints
+ *
+ * Scan all endpoints attached to a port, locate their attached CRTCs,
+ * and generate the DRM mask of CRTCs which may be attached to this
+ * encoder.
+ *
+ * See Documentation/devicetree/bindings/graph.txt for the bindings.
+ */
+uint32_t drm_of_find_possible_crtcs(struct drm_device *dev,
+				    struct device_node *port)
+{
+	struct device_node *remote_port, *ep = NULL;
+	uint32_t possible_crtcs = 0;
+
+	do {
+		ep = of_graph_get_next_endpoint(port, ep);
+		if (!ep)
+			break;
+
+		remote_port = of_graph_get_remote_port(ep);
+		if (!remote_port) {
+			of_node_put(ep);
+			return 0;
+		}
+
+		possible_crtcs |= drm_crtc_port_mask(dev, remote_port);
+
+		of_node_put(remote_port);
+	} while (1);
+
+	return possible_crtcs;
+}
+EXPORT_SYMBOL(drm_of_find_possible_crtcs);
@@ -41,6 +41,7 @@
 struct drm_object_properties;
 struct drm_file;
 struct drm_clip_rect;
+struct device_node;
  
 #define DRM_MODE_OBJECT_CRTC 0xcccccccc
 #define DRM_MODE_OBJECT_CONNECTOR 0xc0c0c0c0
@@ -314,6 +315,7 @@
  */
 struct drm_crtc {
 	struct drm_device *dev;
+	struct device_node *port;
 	struct list_head head;
  
 	/**
+#ifndef __DRM_OF_H__
+#define __DRM_OF_H__
+
+struct drm_device;
+struct device_node;
+
+#ifdef CONFIG_OF
+extern uint32_t drm_of_find_possible_crtcs(struct drm_device *dev,
+					   struct device_node *port);
+#else
+static inline uint32_t drm_of_find_possible_crtcs(struct drm_device *dev,
+						  struct device_node *port)
+{
+	return 0;
+}
+#endif
+
+#endif /* __DRM_OF_H__ */
...	...	@@ -20,6 +20,7 @@
20	20	drm-$(CONFIG_DRM_GEM_CMA_HELPER) += drm_gem_cma_helper.o
21	21	drm-$(CONFIG_PCI) += ati_pcigart.o
22	22	drm-$(CONFIG_DRM_PANEL) += drm_panel.o
	23	+drm-$(CONFIG_OF) += drm_of.o
23	24
24	25	drm-usb-y := drm_usb.o
25	26
	1	+#include <linux/export.h>
	2	+#include <linux/list.h>
	3	+#include <linux/of_graph.h>
	4	+#include <drm/drmP.h>
	5	+#include <drm/drm_crtc.h>
	6	+#include <drm/drm_of.h>
	7	+
	8	+/**
	9	+ * drm_crtc_port_mask - find the mask of a registered CRTC by port OF node
	10	+ * @dev: DRM device
	11	+ * @port: port OF node
	12	+ *
	13	+ * Given a port OF node, return the possible mask of the corresponding
	14	+ * CRTC within a device's list of CRTCs. Returns zero if not found.
	15	+ */
	16	+static uint32_t drm_crtc_port_mask(struct drm_device *dev,
	17	+ struct device_node *port)
	18	+{
	19	+ unsigned int index = 0;
	20	+ struct drm_crtc *tmp;
	21	+
	22	+ list_for_each_entry(tmp, &dev->mode_config.crtc_list, head) {
	23	+ if (tmp->port == port)
	24	+ return 1 << index;
	25	+
	26	+ index++;
	27	+ }
	28	+
	29	+ return 0;
	30	+}
	31	+
	32	+/**
	33	+ * drm_of_find_possible_crtcs - find the possible CRTCs for an encoder port
	34	+ * @dev: DRM device
	35	+ * @port: encoder port to scan for endpoints
	36	+ *
	37	+ * Scan all endpoints attached to a port, locate their attached CRTCs,
	38	+ * and generate the DRM mask of CRTCs which may be attached to this
	39	+ * encoder.
	40	+ *
	41	+ * See Documentation/devicetree/bindings/graph.txt for the bindings.
	42	+ */
	43	+uint32_t drm_of_find_possible_crtcs(struct drm_device *dev,
	44	+ struct device_node *port)
	45	+{
	46	+ struct device_node remote_port, ep = NULL;
	47	+ uint32_t possible_crtcs = 0;
	48	+
	49	+ do {
	50	+ ep = of_graph_get_next_endpoint(port, ep);
	51	+ if (!ep)
	52	+ break;
	53	+
	54	+ remote_port = of_graph_get_remote_port(ep);
	55	+ if (!remote_port) {
	56	+ of_node_put(ep);
	57	+ return 0;
	58	+ }
	59	+
	60	+ possible_crtcs \|= drm_crtc_port_mask(dev, remote_port);
	61	+
	62	+ of_node_put(remote_port);
	63	+ } while (1);
	64	+
	65	+ return possible_crtcs;
	66	+}
	67	+EXPORT_SYMBOL(drm_of_find_possible_crtcs);
...	...	@@ -41,6 +41,7 @@
41	41	struct drm_object_properties;
42	42	struct drm_file;
43	43	struct drm_clip_rect;
	44	+struct device_node;
44	45
45	46	#define DRM_MODE_OBJECT_CRTC 0xcccccccc
46	47	#define DRM_MODE_OBJECT_CONNECTOR 0xc0c0c0c0
...	...	@@ -314,6 +315,7 @@
314	315	*/
315	316	struct drm_crtc {
316	317	struct drm_device *dev;
	318	+ struct device_node *port;
317	319	struct list_head head;
318	320
319	321	/**
	1	+#ifndef __DRM_OF_H__
	2	+#define __DRM_OF_H__
	3	+
	4	+struct drm_device;
	5	+struct device_node;
	6	+
	7	+#ifdef CONFIG_OF
	8	+extern uint32_t drm_of_find_possible_crtcs(struct drm_device *dev,
	9	+ struct device_node *port);
	10	+#else
	11	+static inline uint32_t drm_of_find_possible_crtcs(struct drm_device *dev,
	12	+ struct device_node *port)
	13	+{
	14	+ return 0;
	15	+}
	16	+#endif
	17	+
	18	+#endif /* __DRM_OF_H__ */