[PATCH 08/11] apple-gmux: Add support for the switch_ddc callback

[Matthew Garrett]

We can switch DDC pins in a way that ought (with luck) to work for LVDS.
This isn't sufficient for eDP, which is addressed in later patches.

Signed-off-by: Matthew Garrett <matthew.garrett at nebula.com>
---
 drivers/platform/x86/apple-gmux.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/platform/x86/apple-gmux.c b/drivers/platform/x86/apple-gmux.c
index b9429fb..5594cbc 100644
--- a/drivers/platform/x86/apple-gmux.c
+++ b/drivers/platform/x86/apple-gmux.c
@@ -271,6 +271,16 @@ static const struct backlight_ops gmux_bl_ops = {
 	.update_status = gmux_update_status,
 };
 
+static int gmux_switch_ddc(enum vga_switcheroo_client_id id)
+{
+	if (id == VGA_SWITCHEROO_IGD)
+		gmux_write8(apple_gmux_data, GMUX_PORT_SWITCH_DDC, 1);
+	else
+		gmux_write8(apple_gmux_data, GMUX_PORT_SWITCH_DDC, 2);
+
+	return 0;
+}
+
 static int gmux_switchto(enum vga_switcheroo_client_id id)
 {
 	if (id == VGA_SWITCHEROO_IGD) {
@@ -346,6 +356,7 @@ gmux_active_client(struct apple_gmux_data *gmux_data)
 
 static struct vga_switcheroo_handler gmux_handler = {
 	.switchto = gmux_switchto,
+	.switch_ddc = gmux_switch_ddc,
 	.power_state = gmux_set_power_state,
 	.get_client_id = gmux_get_client_id,
 };
-- 
1.8.5.3