projects / mirror_ubuntu-artful-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| 7e435aad RK |
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 | ||
| 6295d607 | 22 | drm_for_each_crtc(tmp, dev) { |
| 7e435aad RK |
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 | { | |
| 7416f4e3 | 46 | struct device_node *remote_port, *ep; |
| 7e435aad RK |
47 | uint32_t possible_crtcs = 0; |
| 48 | ||
| 7416f4e3 | 49 | for_each_endpoint_of_node(port, ep) { |
| 7e435aad RK |
50 | remote_port = of_graph_get_remote_port(ep); |
| 51 | if (!remote_port) { | |
| 52 | of_node_put(ep); | |
| 53 | return 0; | |
| 54 | } | |
| 55 | ||
| 56 | possible_crtcs |= drm_crtc_port_mask(dev, remote_port); | |
| 57 | ||
| 58 | of_node_put(remote_port); | |
| 7416f4e3 | 59 | } |
| 7e435aad RK |
60 | |
| 61 | return possible_crtcs; | |
| 62 | } | |
| 63 | EXPORT_SYMBOL(drm_of_find_possible_crtcs); |