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drm/nouveau: Add support to control backlight using bl_power for nva3.

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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: Antonio Gomes <antoniospg100@gmail.com>
Signed-off-by: Karol Herbst <kherbst@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221104220424.41164-1-antoniospg100@gmail.com
This commit is contained in:
Antonio Gomes
2022-11-04 19:04:23 -03:00
committed by Karol Herbst
parent d23a6e3f76
commit 9df38728f7
1 changed files with 5 additions and 1 deletions
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6
drivers/gpu/drm/nouveau/nouveau_backlight.c
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@@ -264,7 +264,11 @@ 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 |