iwlwifi: mvm: fix comment indentation

[cascardo/linux.git] / include / linux / vga_switcheroo.h

diff --git a/include/linux/vga_switcheroo.h b/include/linux/vga_switcheroo.h
index 69e1d4a..b39a5f3 100644 (file)
--- a/include/linux/vga_switcheroo.h
+++ b/include/linux/vga_switcheroo.h
@@ -35,6 +35,26 @@
 
 struct pci_dev;
 
+/**
+ * enum vga_switcheroo_handler_flags_t - handler flags bitmask
+ * @VGA_SWITCHEROO_CAN_SWITCH_DDC: whether the handler is able to switch the
+ *     DDC lines separately. This signals to clients that they should call
+ *     drm_get_edid_switcheroo() to probe the EDID
+ * @VGA_SWITCHEROO_NEEDS_EDP_CONFIG: whether the handler is unable to switch
+ *     the AUX channel separately. This signals to clients that the active
+ *     GPU needs to train the link and communicate the link parameters to the
+ *     inactive GPU (mediated by vga_switcheroo). The inactive GPU may then
+ *     skip the AUX handshake and set up its output with these pre-calibrated
+ *     values (DisplayPort specification v1.1a, section 2.5.3.3)
+ *
+ * Handler flags bitmask. Used by handlers to declare their capabilities upon
+ * registering with vga_switcheroo.
+ */
+enum vga_switcheroo_handler_flags_t {
+       VGA_SWITCHEROO_CAN_SWITCH_DDC   = (1 << 0),
+       VGA_SWITCHEROO_NEEDS_EDP_CONFIG = (1 << 1),
+};
+
 /**
  * enum vga_switcheroo_state - client power state
  * @VGA_SWITCHEROO_OFF: off
@@ -82,6 +102,9 @@ enum vga_switcheroo_client_id {
  *     Mandatory. For muxless machines this should be a no-op. Returning 0
  *     denotes success, anything else failure (in which case the switch is
  *     aborted)
+ * @switch_ddc: switch DDC lines to given client.
+ *     Optional. Should return the previous DDC owner on success or a
+ *     negative int on failure
  * @power_state: cut or reinstate power of given client.
  *     Optional. The return value is ignored
  * @get_client_id: determine if given pci device is integrated or discrete GPU.
@@ -93,6 +116,7 @@ enum vga_switcheroo_client_id {
 struct vga_switcheroo_handler {
        int (*init)(void);
        int (*switchto)(enum vga_switcheroo_client_id id);
+       int (*switch_ddc)(enum vga_switcheroo_client_id id);
        int (*power_state)(enum vga_switcheroo_client_id id,
                           enum vga_switcheroo_state state);
        enum vga_switcheroo_client_id (*get_client_id)(struct pci_dev *pdev);
@@ -132,8 +156,12 @@ int vga_switcheroo_register_audio_client(struct pci_dev *pdev,
 void vga_switcheroo_client_fb_set(struct pci_dev *dev,
                                  struct fb_info *info);
 
-int vga_switcheroo_register_handler(const struct vga_switcheroo_handler *handler);
+int vga_switcheroo_register_handler(const struct vga_switcheroo_handler *handler,
+                                   enum vga_switcheroo_handler_flags_t handler_flags);
 void vga_switcheroo_unregister_handler(void);
+enum vga_switcheroo_handler_flags_t vga_switcheroo_handler_flags(void);
+int vga_switcheroo_lock_ddc(struct pci_dev *pdev);
+int vga_switcheroo_unlock_ddc(struct pci_dev *pdev);
 
 int vga_switcheroo_process_delayed_switch(void);
 
@@ -150,11 +178,15 @@ static inline void vga_switcheroo_unregister_client(struct pci_dev *dev) {}
 static inline int vga_switcheroo_register_client(struct pci_dev *dev,
                const struct vga_switcheroo_client_ops *ops, bool driver_power_control) { return 0; }
 static inline void vga_switcheroo_client_fb_set(struct pci_dev *dev, struct fb_info *info) {}
-static inline int vga_switcheroo_register_handler(const struct vga_switcheroo_handler *handler) { return 0; }
+static inline int vga_switcheroo_register_handler(const struct vga_switcheroo_handler *handler,
+               enum vga_switcheroo_handler_flags_t handler_flags) { return 0; }
 static inline int vga_switcheroo_register_audio_client(struct pci_dev *pdev,
        const struct vga_switcheroo_client_ops *ops,
        enum vga_switcheroo_client_id id) { return 0; }
 static inline void vga_switcheroo_unregister_handler(void) {}
+static inline enum vga_switcheroo_handler_flags_t vga_switcheroo_handler_flags(void) { return 0; }
+static inline int vga_switcheroo_lock_ddc(struct pci_dev *pdev) { return -ENODEV; }
+static inline int vga_switcheroo_unlock_ddc(struct pci_dev *pdev) { return -ENODEV; }
 static inline int vga_switcheroo_process_delayed_switch(void) { return 0; }
 static inline enum vga_switcheroo_state vga_switcheroo_get_client_state(struct pci_dev *dev) { return VGA_SWITCHEROO_ON; }