From: Seth Forshee seth.forshee@canonical.com
Add vga_switcheroo_get_active_client() to allow drivers to get the active video client. This will be used by drivers wishing to temporarily mux only the DDC to the inactive client.
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=88861 Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=61115 Tested-by: Paul Hordiienko pvt.gord@gmail.com [MBP 6,2 2010 intel ILK + nvidia GT216 pre-retina] Tested-by: William Brown william@blackhats.net.au [MBP 8,2 2011 intel SNB + amd turks pre-retina] Tested-by: Lukas Wunner lukas@wunner.de [MBP 9,1 2012 intel IVB + nvidia GK107 pre-retina] Tested-by: Bruno Bierbaumer bruno@bierbaumer.net [MBP 11,3 2013 intel HSW + nvidia GK107 retina -- work in progress]
Signed-off-by: Seth Forshee seth.forshee@canonical.com Signed-off-by: Dave Airlie airlied@gmail.com Signed-off-by: Lukas Wunner lukas@wunner.de --- drivers/gpu/vga/vga_switcheroo.c | 14 ++++++++++++++ include/linux/vga_switcheroo.h | 2 ++ 2 files changed, 16 insertions(+)
diff --git a/drivers/gpu/vga/vga_switcheroo.c b/drivers/gpu/vga/vga_switcheroo.c index 0d3ac20..620c4ac 100644 --- a/drivers/gpu/vga/vga_switcheroo.c +++ b/drivers/gpu/vga/vga_switcheroo.c @@ -209,6 +209,20 @@ find_active_client(struct list_head *head) return NULL; }
+struct pci_dev *vga_switcheroo_get_active_client(void) +{ + struct vga_switcheroo_client *client; + struct pci_dev *pdev = NULL; + + mutex_lock(&vgasr_mutex); + client = find_active_client(&vgasr_priv.clients); + if (client) + pdev = client->pdev; + mutex_unlock(&vgasr_mutex); + return pdev; +} +EXPORT_SYMBOL(vga_switcheroo_get_active_client); + int vga_switcheroo_get_client_state(struct pci_dev *pdev) { struct vga_switcheroo_client *client; diff --git a/include/linux/vga_switcheroo.h b/include/linux/vga_switcheroo.h index 2fef78b..c81a686 100644 --- a/include/linux/vga_switcheroo.h +++ b/include/linux/vga_switcheroo.h @@ -62,6 +62,7 @@ void vga_switcheroo_unregister_handler(void);
int vga_switcheroo_process_delayed_switch(void);
+struct pci_dev *vga_switcheroo_get_active_client(void); int vga_switcheroo_get_client_state(struct pci_dev *dev);
void vga_switcheroo_set_dynamic_switch(struct pci_dev *pdev, enum vga_switcheroo_state dynamic); @@ -82,6 +83,7 @@ static inline int vga_switcheroo_register_audio_client(struct pci_dev *pdev, int id, bool active) { return 0; } static inline void vga_switcheroo_unregister_handler(void) {} static inline int vga_switcheroo_process_delayed_switch(void) { return 0; } +static inline struct pci_dev *vga_switcheroo_get_active_client(void) { return NULL; } static inline int vga_switcheroo_get_client_state(struct pci_dev *dev) { return VGA_SWITCHEROO_ON; }
static inline void vga_switcheroo_set_dynamic_switch(struct pci_dev *pdev, enum vga_switcheroo_state dynamic) {}