[Nouveau] [PATCH] drm/nouveau: Adding support to control backlight using bl_power for nva3.

[antoniospg]

Test plan:

* Turn off:
echo 1 > /sys/class/backlight/nv_backlight/bl_power

* Turn on:
echo 0 > /sys/class/backlight/nv_backlight/bl_power

Signed-off-by: antoniospg <antoniospg...@gmail.com>
---
 drivers/gpu/drm/nouveau/nouveau_backlight.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/nouveau/nouveau_backlight.c 
b/drivers/gpu/drm/nouveau/nouveau_backlight.c
index a2141d3d9b1d..855d0ce9f7fa 100644
--- a/drivers/gpu/drm/nouveau/nouveau_backlight.c
+++ b/drivers/gpu/drm/nouveau/nouveau_backlight.c
@@ -263,7 +263,16 @@ nva3_set_intensity(struct backlight_device *bd)
        u32 div, val;
 
        div = nvif_rd32(device, NV50_PDISP_SOR_PWM_DIV(or));
-       val = (bd->props.brightness * div) / 100;
+
+       switch (bd->props.power) {
+       case FB_BLANK_UNBLANK:
+               val = (bd->props.brightness * div) / 100;
+               break;
+       default:
+               val = 0;
+               break;
+       }
+
        if (div) {
                nvif_wr32(device, NV50_PDISP_SOR_PWM_CTL(or),
                          val |
-- 
2.25.1