[PATCH] drm/nouveau/disp: Fix missing backlight control on Macbook 5, 1

[Takashi Iwai]

Macbook 5,1 with MCP79 lost its backlight control since the recent
change for supporting GFP-RM; it rewrote the whole nv50 backlight
control code and each display engine is supposed to have an entry for
IOR bl callback, but it didn't cover mcp77.

This patch adds the missing bl entry initialization for mcp77 display
engine to recover the backlight control.

Fixes: 2274ce7e3681 ("drm/nouveau/disp: add output backlight control methods")
Cc: <stable at vger.kernel.org>
Link: https://bugzilla.suse.com/show_bug.cgi?id=1223838
Signed-off-by: Takashi Iwai <tiwai at suse.de>
---
 drivers/gpu/drm/nouveau/nvkm/engine/disp/mcp77.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/nouveau/nvkm/engine/disp/mcp77.c b/drivers/gpu/drm/nouveau/nvkm/engine/disp/mcp77.c
index 841e3b69fcaf..5a0c9b8a79f3 100644
--- a/drivers/gpu/drm/nouveau/nvkm/engine/disp/mcp77.c
+++ b/drivers/gpu/drm/nouveau/nvkm/engine/disp/mcp77.c
@@ -31,6 +31,7 @@ mcp77_sor = {
 	.state = g94_sor_state,
 	.power = nv50_sor_power,
 	.clock = nv50_sor_clock,
+	.bl = &nv50_sor_bl,
 	.hdmi = &g84_sor_hdmi,
 	.dp = &g94_sor_dp,
 };
-- 
2.43.0