linux-kernel - [PATCH v3] drm/nouveau: Add support to control backlight using bl

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Message-Id: <20221104220122.38622-1-antoniospg100@gmail.com>
Date:   Fri,  4 Nov 2022 19:01:21 -0300
From:   Antonio Gomes <antoniospg100@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     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, nouveau@...ts.freedesktop.org
Subject: [PATCH v3] drm/nouveau: Add support to control backlight using bl_power for nva3.

From: antoniospg <antoniospg100@...il.com>

Summary:

* Add support to turn on/off backlight when changing values in bl_power
  file. This is achieved by using function backlight_get_brightness()
  in nva3_set_intensity to get current brightness.

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 | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/nouveau/nouveau_backlight.c b/drivers/gpu/drm/nouveau/nouveau_backlight.c
index a2141d3d9b1d..5c82f5189b79 100644
--- a/drivers/gpu/drm/nouveau/nouveau_backlight.c
+++ b/drivers/gpu/drm/nouveau/nouveau_backlight.c
@@ -263,7 +263,11 @@ 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;
+
+	val = backlight_get_brightness(bd);
+	if (val)
+		val = (val * div) / 100;
+
 	if (div) {
 		nvif_wr32(device, NV50_PDISP_SOR_PWM_CTL(or),
 			  val |
-- 
2.25.1