Nouveau - Jan 2025 - [PATCH RESEND] drm/nouveau/disp: Fix missing backlight control on Macbook 5, 1

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>
---

The previous submission seemed fallin in a crack:
  https://lore.kernel.org/all/20240517110853.8481-1-tiwai at suse.de/
so just resending it.

 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