[PATCH v2 01/22] vga_switcheroo: Add support for switching only the DDC

[Lukas Wunner]

From: Seth Forshee <seth.forshee at canonical.com>

During graphics driver initialization its useful to be able to mux only
the DDC to the inactive client in order to read the EDID. Add a
switch_ddc callback to allow capable handlers to provide this
functionality, and add vga_switcheroo_switch_ddc() to allow DRM to mux
only the DDC.

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 at gmail.com>
    [MBP  6,2 2010  intel ILK + nvidia GT216  pre-retina]
Tested-by: William Brown <william at blackhats.net.au>
    [MBP  8,2 2011  intel SNB + amd turks     pre-retina]
Tested-by: Lukas Wunner <lukas at wunner.de>
    [MBP  9,1 2012  intel IVB + nvidia GK107  pre-retina]
Tested-by: Bruno Bierbaumer <bruno at bierbaumer.net>
    [MBP 11,3 2013  intel HSW + nvidia GK107  retina -- work in progress]

Signed-off-by: Seth Forshee <seth.forshee at canonical.com>
Signed-off-by: Dave Airlie <airlied at gmail.com>
Signed-off-by: Lukas Wunner <lukas at wunner.de>
---
 drivers/gpu/vga/vga_switcheroo.c | 39 ++++++++++++++++++++++++++++++++++++++-
 include/linux/vga_switcheroo.h   |  4 ++++
 2 files changed, 42 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/vga/vga_switcheroo.c b/drivers/gpu/vga/vga_switcheroo.c
index 37ac7b5..0d3ac20 100644
--- a/drivers/gpu/vga/vga_switcheroo.c
+++ b/drivers/gpu/vga/vga_switcheroo.c
@@ -256,6 +256,29 @@ void vga_switcheroo_client_fb_set(struct pci_dev *pdev,
 }
 EXPORT_SYMBOL(vga_switcheroo_client_fb_set);
 
+int vga_switcheroo_switch_ddc(struct pci_dev *pdev)
+{
+	int ret = 0;
+	int id;
+
+	mutex_lock(&vgasr_mutex);
+
+	if (!vgasr_priv.handler) {
+		ret = -ENODEV;
+		goto out;
+	}
+
+	if (vgasr_priv.handler->switch_ddc) {
+		id = vgasr_priv.handler->get_client_id(pdev);
+		ret = vgasr_priv.handler->switch_ddc(id);
+	}
+
+out:
+	mutex_unlock(&vgasr_mutex);
+	return ret;
+}
+EXPORT_SYMBOL(vga_switcheroo_switch_ddc);
+
 static int vga_switcheroo_show(struct seq_file *m, void *v)
 {
 	struct vga_switcheroo_client *client;
@@ -353,9 +376,15 @@ static int vga_switchto_stage2(struct vga_switcheroo_client *new_client)
 		console_unlock();
 	}
 
+	if (vgasr_priv.handler->switch_ddc) {
+		ret = vgasr_priv.handler->switch_ddc(new_client->id);
+		if (ret)
+			return ret;
+	}
+
 	ret = vgasr_priv.handler->switchto(new_client->id);
 	if (ret)
-		return ret;
+		goto restore_ddc;
 
 	if (new_client->ops->reprobe)
 		new_client->ops->reprobe(new_client->pdev);
@@ -367,6 +396,14 @@ static int vga_switchto_stage2(struct vga_switcheroo_client *new_client)
 
 	new_client->active = true;
 	return 0;
+
+restore_ddc:
+	if (vgasr_priv.handler->switch_ddc) {
+		int id = (new_client->id == VGA_SWITCHEROO_IGD) ?
+				VGA_SWITCHEROO_DIS : VGA_SWITCHEROO_IGD;
+		ret = vgasr_priv.handler->switch_ddc(id);
+	}
+	return ret;
 }
 
 static bool check_can_switch(void)
diff --git a/include/linux/vga_switcheroo.h b/include/linux/vga_switcheroo.h
index b483abd..2fef78b 100644
--- a/include/linux/vga_switcheroo.h
+++ b/include/linux/vga_switcheroo.h
@@ -29,6 +29,7 @@ enum vga_switcheroo_client_id {
 };
 
 struct vga_switcheroo_handler {
+	int (*switch_ddc)(enum vga_switcheroo_client_id id);
 	int (*switchto)(enum vga_switcheroo_client_id id);
 	int (*power_state)(enum vga_switcheroo_client_id id,
 			   enum vga_switcheroo_state state);
@@ -54,6 +55,8 @@ 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_switch_ddc(struct pci_dev *pdev);
+
 int vga_switcheroo_register_handler(struct vga_switcheroo_handler *handler);
 void vga_switcheroo_unregister_handler(void);
 
@@ -72,6 +75,7 @@ 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 void vga_switcheroo_switch_ddc(struct pci_dev *pdev) { return NULL; }
 static inline int vga_switcheroo_register_handler(struct vga_switcheroo_handler *handler) { return 0; }
 static inline int vga_switcheroo_register_audio_client(struct pci_dev *pdev,
 	const struct vga_switcheroo_client_ops *ops,
-- 
1.8.5.2 (Apple Git-48)