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Subject[PATCH] drm/nouveau/kms/nv50-: fix build failure with CONFIG_BACKLIGHT=n
Date
From: Arnd Bergmann <arnd@arndb.de>

When the backlight support is disabled, the driver fails to build:

drivers/gpu/drm/nouveau/dispnv50/disp.c: In function 'nv50_sor_atomic_disable':
drivers/gpu/drm/nouveau/dispnv50/disp.c:1665:59: error: 'struct nouveau_connector' has no member named 'backlight'
1665 | struct nouveau_backlight *backlight = nv_connector->backlight;
| ^~
drivers/gpu/drm/nouveau/dispnv50/disp.c:1670:35: error: invalid use of undefined type 'struct nouveau_backlight'
1670 | if (backlight && backlight->uses_dpcd) {
| ^~
drivers/gpu/drm/nouveau/dispnv50/disp.c:1671:64: error: invalid use of undefined type 'struct nouveau_backlight'
1671 | ret = drm_edp_backlight_disable(aux, &backlight->edp_info);
| ^~

The patch that introduced the problem already contains some #ifdef
checks, so just add another one that makes it build again.

Fixes: 6eca310e8924 ("drm/nouveau/kms/nv50-: Add basic DPCD backlight support for nouveau")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
drivers/gpu/drm/nouveau/dispnv50/disp.c | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/nouveau/dispnv50/disp.c b/drivers/gpu/drm/nouveau/dispnv50/disp.c
index 093e1f7163b3..fcf53e24db21 100644
--- a/drivers/gpu/drm/nouveau/dispnv50/disp.c
+++ b/drivers/gpu/drm/nouveau/dispnv50/disp.c
@@ -1659,20 +1659,23 @@ static void
nv50_sor_atomic_disable(struct drm_encoder *encoder, struct drm_atomic_state *state)
{
struct nouveau_encoder *nv_encoder = nouveau_encoder(encoder);
- struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
struct nouveau_crtc *nv_crtc = nouveau_crtc(nv_encoder->crtc);
struct nouveau_connector *nv_connector = nv50_outp_get_old_connector(state, nv_encoder);
- struct nouveau_backlight *backlight = nv_connector->backlight;
struct drm_dp_aux *aux = &nv_connector->aux;
- int ret;
u8 pwr;

+#ifdef CONFIG_DRM_NOUVEAU_BACKLIGHT
+ struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
+ struct nouveau_backlight *backlight = nv_connector->backlight;
+
if (backlight && backlight->uses_dpcd) {
- ret = drm_edp_backlight_disable(aux, &backlight->edp_info);
+ int ret = drm_edp_backlight_disable(aux, &backlight->edp_info);
+
if (ret < 0)
NV_ERROR(drm, "Failed to disable backlight on [CONNECTOR:%d:%s]: %d\n",
nv_connector->base.base.id, nv_connector->base.name, ret);
}
+#endif

if (nv_encoder->dcb->type == DCB_OUTPUT_DP) {
int ret = drm_dp_dpcd_readb(aux, DP_SET_POWER, &pwr);
--
2.29.2
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