drm/nouveau/kms/nv50-: move drm format->hw conversion into common code

This will be required to support additional HW features.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
diff --git a/drivers/gpu/drm/nouveau/dispnv50/wndw.c b/drivers/gpu/drm/nouveau/dispnv50/wndw.c
index 8a7636f..cfd998a 100644
--- a/drivers/gpu/drm/nouveau/dispnv50/wndw.c
+++ b/drivers/gpu/drm/nouveau/dispnv50/wndw.c
@@ -169,6 +169,27 @@ nv50_wndw_atomic_check_release(struct nv50_wndw *wndw,
 }
 
 static int
+nv50_wndw_atomic_check_acquire_rgb(struct nv50_wndw_atom *asyw)
+{
+	switch (asyw->state.fb->format->format) {
+	case DRM_FORMAT_C8         : asyw->image.format = 0x1e; break;
+	case DRM_FORMAT_XRGB8888   :
+	case DRM_FORMAT_ARGB8888   : asyw->image.format = 0xcf; break;
+	case DRM_FORMAT_RGB565     : asyw->image.format = 0xe8; break;
+	case DRM_FORMAT_XRGB1555   :
+	case DRM_FORMAT_ARGB1555   : asyw->image.format = 0xe9; break;
+	case DRM_FORMAT_XBGR2101010:
+	case DRM_FORMAT_ABGR2101010: asyw->image.format = 0xd1; break;
+	case DRM_FORMAT_XBGR8888   :
+	case DRM_FORMAT_ABGR8888   : asyw->image.format = 0xd5; break;
+	default:
+		WARN_ON(1);
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static int
 nv50_wndw_atomic_check_acquire(struct nv50_wndw *wndw,
 			       struct nv50_wndw_atom *asyw,
 			       struct nv50_head_atom *asyh)
@@ -183,6 +204,10 @@ nv50_wndw_atomic_check_acquire(struct nv50_wndw *wndw,
 	asyw->image.h = fb->base.height;
 	asyw->image.kind = fb->nvbo->kind;
 
+	ret = nv50_wndw_atomic_check_acquire_rgb(asyw);
+	if (ret)
+		return ret;
+
 	if (asyh->state.pageflip_flags & DRM_MODE_PAGE_FLIP_ASYNC)
 		asyw->interval = 0;
 	else