[PATCH 06/14] drm/vmwgfx: Add implicit framebuffer checks to the screen target code

[Thomas Hellstrom]

Just like for screen objects, make sure we use only a single framebuffer
for implicit placement.

Signed-off-by: Thomas Hellstrom <thellstrom at vmware.com>
Reviewed-by: Sinclair Yeh <syeh at vmware.com>
---
 drivers/gpu/drm/vmwgfx/vmwgfx_stdu.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_stdu.c 
b/drivers/gpu/drm/vmwgfx/vmwgfx_stdu.c
index c93af71..a5ab826 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_stdu.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_stdu.c
@@ -510,6 +510,7 @@ out_srf_unref:
 static int vmw_stdu_crtc_set_config(struct drm_mode_set *set)
 {
        struct vmw_private *dev_priv;
+       struct vmw_framebuffer *vfb;
        struct vmw_screen_target_display_unit *stdu;
        struct drm_display_mode *mode;
        struct drm_framebuffer  *new_fb;
@@ -529,6 +530,7 @@ static int vmw_stdu_crtc_set_config(struct drm_mode_set 
*set)
        new_fb   = set->fb;
        dev_priv = vmw_priv(crtc->dev);
        turning_off = set->num_connectors == 0 || !mode || !new_fb;
+       vfb = (new_fb) ? vmw_framebuffer_to_vfb(new_fb) : NULL;

        if (set->num_connectors > 1) {
                DRM_ERROR("Too many connectors\n");
@@ -548,6 +550,14 @@ static int vmw_stdu_crtc_set_config(struct drm_mode_set 
*set)
                return -EINVAL;
        }

+       /* Only one active implicit frame-buffer at a time. */
+       if (!turning_off && stdu->base.is_implicit && dev_priv->implicit_fb &&
+           !(dev_priv->num_implicit == 1 && stdu->base.active_implicit)
+           && dev_priv->implicit_fb != vfb) {
+               DRM_ERROR("Multiple implicit framebuffers not supported.\n");
+               return -EINVAL;
+       }
+
        /* Since they always map one to one these are safe */
        connector = &stdu->base.connector;
        encoder   = &stdu->base.encoder;
@@ -559,6 +569,7 @@ static int vmw_stdu_crtc_set_config(struct drm_mode_set 
*set)

                vmw_stdu_unpin_display(stdu);
                (void) vmw_stdu_update_st(dev_priv, stdu);
+               vmw_kms_del_active(dev_priv, &stdu->base);

                ret = vmw_stdu_destroy_st(dev_priv, stdu);
                if (ret)
@@ -603,6 +614,7 @@ static int vmw_stdu_crtc_set_config(struct drm_mode_set 
*set)
        if (ret)
                return ret;

+       vmw_kms_add_active(dev_priv, &stdu->base, vfb);
        crtc->enabled = true;
        connector->encoder = encoder;
        encoder->crtc      = crtc;
@@ -644,13 +656,16 @@ static int vmw_stdu_crtc_page_flip(struct drm_crtc *crtc,
        dev_priv          = vmw_priv(crtc->dev);
        stdu              = vmw_crtc_to_stdu(crtc);

-       if (!stdu->defined)
+       if (!stdu->defined || !vmw_kms_crtc_flippable(dev_priv, crtc))
                return -EINVAL;

        ret = vmw_stdu_bind_fb(dev_priv, crtc, &crtc->mode, new_fb);
        if (ret)
                return ret;

+       if (stdu->base.is_implicit)
+               vmw_kms_update_implicit_fb(dev_priv, crtc);
+
        vclips.x = crtc->x;
        vclips.y = crtc->y;
        vclips.w = crtc->mode.hdisplay;
-- 
2.5.0