On 7/23/21 8:15 AM, Karol Herbst wrote: > On Fri, Jul 23, 2021 at 5:10 PM Randy Dunlap <rdun...@infradead.org> wrote: >> >> On 7/23/21 2:15 AM, Arnd Bergmann wrote: >>> From: Arnd Bergmann <a...@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 <a...@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); >>> >> >> Hm, only Lyude Paul replied to this patch: >> >> https://lore.kernel.org/lkml/20210714171523.413-1-rdun...@infradead.org/ >> > > what's actually the use case of compiling with > CONFIG_DRM_NOUVEAU_BACKLIGHT=n anyway?
Dunno. In this case it was just a randconfig. Still, it needs to be handled in some way - such as the other suggestion in this thread.