vga_switcheroo: add debugging mux switch option.

This allows the mux to be switched from userspace using MIGD/MDIS
command to the switch.

Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 16 insertions, 0 deletions

diff --git a/drivers/gpu/vga/vga_switcheroo.c b/drivers/gpu/vga/vga_switcheroo.c
index c3c213b74478..463691a1650e 100644
--- a/drivers/gpu/vga/vga_switcheroo.c
+++ b/drivers/gpu/vga/vga_switcheroo.c
@@ -266,6 +266,7 @@ vga_switcheroo_debugfs_write(struct file *filp, const char __user *ubuf,
         const char *pdev_name;
         int i, ret;
         bool delay = false, can_switch;
+        bool just_mux = false;
         int client_id = -1;
         struct vga_switcheroo_client *client = NULL;
 
@@ -320,6 +321,15 @@ vga_switcheroo_debugfs_write(struct file *filp, const char __user *ubuf,
         if (strncmp(usercmd, "DIS", 3) == 0)
                 client_id = VGA_SWITCHEROO_DIS;
 
+        if (strncmp(usercmd, "MIGD", 3) == 0) {
+                just_mux = true;
+                client_id = VGA_SWITCHEROO_IGD;
+        }
+        if (strncmp(usercmd, "MDIS", 3) == 0) {
+                just_mux = true;
+                client_id = VGA_SWITCHEROO_DIS;
+        }
+
         if (client_id == -1)
                 goto out;
 
@@ -331,6 +341,12 @@ vga_switcheroo_debugfs_write(struct file *filp, const char __user *ubuf,
         }
 
         vgasr_priv.delayed_switch_active = false;
+
+        if (just_mux) {
+                ret = vgasr_priv.handler->switchto(client_id);
+                goto out;
+        }
+
         /* okay we want a switch - test if devices are willing to switch */
         can_switch = true;
         for (i = 0; i < VGA_SWITCHEROO_MAX_CLIENTS; i++) {