linux-kernel - [PATCH] drm/nouveau: Adding support to control backlight using bl

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Date:   Sat, 29 Oct 2022 15:42:55 -0300
From:   antoniospg <antoniospg100@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     antoniospg <antoniospg100@...il.com>,
        Ben Skeggs <bskeggs@...hat.com>,
        Karol Herbst <kherbst@...hat.com>,
        Lyude Paul <lyude@...hat.com>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org (open list:DRM DRIVER FOR NVIDIA
        GEFORCE/QUADRO GPUS),
        nouveau@...ts.freedesktop.org (open list:DRM DRIVER FOR NVIDIA
        GEFORCE/QUADRO GPUS)
Subject: [PATCH] drm/nouveau: Adding support to control backlight using bl_power for nva3.

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 <antoniospg100@...il.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