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/
--
~Randy
