diff options
Diffstat (limited to 'drivers/gpu/drm/nouveau/dispnv50/head.c')
| -rw-r--r-- | drivers/gpu/drm/nouveau/dispnv50/head.c | 41 |
1 files changed, 27 insertions, 14 deletions
diff --git a/drivers/gpu/drm/nouveau/dispnv50/head.c b/drivers/gpu/drm/nouveau/dispnv50/head.c index 06ee23823a68..929d93b1677e 100644 --- a/drivers/gpu/drm/nouveau/dispnv50/head.c +++ b/drivers/gpu/drm/nouveau/dispnv50/head.c @@ -169,14 +169,34 @@ nv50_head_atomic_check_view(struct nv50_head_atom *armh, */ switch (mode) { case DRM_MODE_SCALE_CENTER: - asyh->view.oW = min((u16)umode->hdisplay, asyh->view.oW); - asyh->view.oH = min((u16)umode_vdisplay, asyh->view.oH); - /* fall-through */ + /* NOTE: This will cause scaling when the input is + * larger than the output. + */ + asyh->view.oW = min(asyh->view.iW, asyh->view.oW); + asyh->view.oH = min(asyh->view.iH, asyh->view.oH); + break; case DRM_MODE_SCALE_ASPECT: - if (asyh->view.oH < asyh->view.oW) { + /* Determine whether the scaling should be on width or on + * height. This is done by comparing the aspect ratios of the + * sizes. If the output AR is larger than input AR, that means + * we want to change the width (letterboxed on the + * left/right), otherwise on the height (letterboxed on the + * top/bottom). + * + * E.g. 4:3 (1.333) AR image displayed on a 16:10 (1.6) AR + * screen will have letterboxes on the left/right. However a + * 16:9 (1.777) AR image on that same screen will have + * letterboxes on the top/bottom. + * + * inputAR = iW / iH; outputAR = oW / oH + * outputAR > inputAR is equivalent to oW * iH > iW * oH + */ + if (asyh->view.oW * asyh->view.iH > asyh->view.iW * asyh->view.oH) { + /* Recompute output width, i.e. left/right letterbox */ u32 r = (asyh->view.iW << 19) / asyh->view.iH; asyh->view.oW = ((asyh->view.oH * r) + (r / 2)) >> 19; } else { + /* Recompute output height, i.e. top/bottom letterbox */ u32 r = (asyh->view.iH << 19) / asyh->view.iW; asyh->view.oH = ((asyh->view.oW * r) + (r / 2)) >> 19; } @@ -421,16 +441,6 @@ nv50_head_atomic_duplicate_state(struct drm_crtc *crtc) } static void -__drm_atomic_helper_crtc_reset(struct drm_crtc *crtc, - struct drm_crtc_state *state) -{ - if (crtc->state) - crtc->funcs->atomic_destroy_state(crtc, crtc->state); - crtc->state = state; - crtc->state->crtc = crtc; -} - -static void nv50_head_reset(struct drm_crtc *crtc) { struct nv50_head_atom *asyh; @@ -438,6 +448,9 @@ nv50_head_reset(struct drm_crtc *crtc) if (WARN_ON(!(asyh = kzalloc(sizeof(*asyh), GFP_KERNEL)))) return; + if (crtc->state) + nv50_head_atomic_destroy_state(crtc, crtc->state); + __drm_atomic_helper_crtc_reset(crtc, &asyh->state); } |