[PATCH 5.17 0185/1126] drm/nouveau/backlight: Just set all backlight types as RAW

Greg Kroah-Hartman
2022-04-05T07:51:00Z

From: Lyude Paul <lyude@redhat.com>

commit b21a142fd2055d8276169efcc95b624ff908a341 upstream.

Currently we can get a warning on systems with eDP backlights like so:

nv_backlight: invalid backlight type
WARNING: CPU: 4 PID: 454 at drivers/video/backlight/backlight.c:420
backlight_device_register+0x226/0x250

This happens as a result of us not filling out props.type for the eDP
backlight, even though we do it for all other backlight types.

Since nothing in our driver uses anything but BACKLIGHT_RAW, let's take the
props\.type assignments out of the codepaths for individual backlight types
and just set it unconditionally to prevent this from happening again.

Signed-off-by: Lyude Paul <lyude@redhat.com>
Fixes: 6eca310e8924 ("drm/nouveau/kms/nv50-: Add basic DPCD backlight support for nouveau")
Cc: <stable@vger.kernel.org> # v5.15+
Reviewed-by: Karol Herbst <kherbst@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220204193319.451119-1-lyude@redhat.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/gpu/drm/nouveau/nouveau_backlight.c | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)

--- a/drivers/gpu/drm/nouveau/nouveau_backlight.c
+++ b/drivers/gpu/drm/nouveau/nouveau_backlight.c
@@ -101,7 +101,6 @@ nv40_backlight_init(struct nouveau_encod
if (!(nvif_rd32(device, NV40_PMC_BACKLIGHT) & NV40_PMC_BACKLIGHT_MASK))
return -ENODEV;

- props->type = BACKLIGHT_RAW;
props->max_brightness = 31;
*ops = &nv40_bl_ops;
return 0;
@@ -343,7 +342,6 @@ nv50_backlight_init(struct nouveau_backl
else
*ops = &nva3_bl_ops;

- props->type = BACKLIGHT_RAW;
props->max_brightness = 100;

return 0;
@@ -411,6 +409,7 @@ nouveau_backlight_init(struct drm_connec
goto fail_alloc;
}

+ props.type = BACKLIGHT_RAW;
bl->dev = backlight_device_register(backlight_name, connector->kdev,
nv_encoder, ops, &props);
if (IS_ERR(bl->dev)) {