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>

diff --git a/drivers/gpu/vga/vga_switcheroo.c b/drivers/gpu/vga/vga_switcheroo.c
index c3c213b74478bc9281a0f1db0814c6afa2691b42..463691a1650ef2c1aa0da8a3e24b780221c21810 100644 (file)
--- 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++) {