On Fri, Jul 23, 2021 at 5:10 PM Randy Dunlap <rdunlap@xxxxxxxxxxxxx> wrote:
>
> On 7/23/21 2:15 AM, Arnd Bergmann wrote:
> > From: Arnd Bergmann <arnd@xxxxxxxx>
> >
> > 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@xxxxxxxx>
> > ---
> > 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-rdunlap@xxxxxxxxxxxxx/
>
what's actually the use case of compiling with
CONFIG_DRM_NOUVEAU_BACKLIGHT=n anyway?
>
>
> --
> ~Randy
>
