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drm/nouveau/kms/nv50-: Explicitly check DPCD backlights for aux enable/brightness

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Since we don't support hybrid AUX/PWM backlights in nouveau right now,
let's add some explicit checks so that we don't break nouveau once we
enable support for these backlights in other drivers.

Reviewed-by: Karol Herbst <kherbst@redhat.com>
Signed-off-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211105183342.130810-3-lyude@redhat.com
This commit is contained in:
Lyude Paul 2021-11-05 14:33:39 -04:00
parent 04f0d6cc62
commit f5dee1283f
1 changed files with 4 additions and 1 deletions
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5
drivers/gpu/drm/nouveau/nouveau_backlight.c
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@ -308,7 +308,10 @@ nv50_backlight_init(struct nouveau_backlight *bl,
if (ret < 0)
return ret;
if (drm_edp_backlight_supported(edp_dpcd)) {
/* TODO: Add support for hybrid PWM/DPCD panels */
if (drm_edp_backlight_supported(edp_dpcd) &&
(edp_dpcd[1] & DP_EDP_BACKLIGHT_AUX_ENABLE_CAP) &&
(edp_dpcd[2] & DP_EDP_BACKLIGHT_BRIGHTNESS_AUX_SET_CAP)) {
NV_DEBUG(drm, "DPCD backlight controls supported on %s\n",
nv_conn->base.name);