>
> From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
>
> Instead of looking at the (soon to be deprecated) plane->fb we'll
> examing plane->state->fb instead. We can do this because
> vmw_du_crtc_atomic_check() prevents us from enabling a crtc
> without the primary plane also being enabled.
>
> Due to that same reason, I'm actually not sure what the checks here are
> for NULL fb. If we can't enable the crtc without an enabled plane
> we should always have an fb. But I'll leave that for someone else
> to figure out.
Hi Ville,
AFAIK the NULL check is set or clear the implicit framebuffer property
which is specific to vmwgfx and for current hardware version is disabled.
I have this future TODO work item to get rid of implicit placement property
or at least make it read only.
I still don’t have complete understanding of atomic state but this patch looks
good to me.
Reviewed-by: Deepak Rawat <drawat@xxxxxxxxxx>
>
> Cc: Thomas Hellstrom <thellstrom@xxxxxxxxxx>
> Cc: Sinclair Yeh <syeh@xxxxxxxxxx>
> Cc: VMware Graphics <linux-graphics-maintainer@xxxxxxxxxx>
> Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
> Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
> ---
> drivers/gpu/drm/vmwgfx/vmwgfx_stdu.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_stdu.c
> b/drivers/gpu/drm/vmwgfx/vmwgfx_stdu.c
> index 90445bc590cb..152e96cb1c01 100644
> --- a/drivers/gpu/drm/vmwgfx/vmwgfx_stdu.c
> +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_stdu.c
> @@ -414,6 +414,7 @@ static void vmw_stdu_crtc_helper_prepare(struct
> drm_crtc *crtc)
> static void vmw_stdu_crtc_atomic_enable(struct drm_crtc *crtc,
> struct drm_crtc_state *old_state)
> {
> + struct drm_plane_state *plane_state = crtc->primary->state;
> struct vmw_private *dev_priv;
> struct vmw_screen_target_display_unit *stdu;
> struct vmw_framebuffer *vfb;
> @@ -422,7 +423,7 @@ static void vmw_stdu_crtc_atomic_enable(struct
> drm_crtc *crtc,
>
> stdu = vmw_crtc_to_stdu(crtc);
> dev_priv = vmw_priv(crtc->dev);
> - fb = crtc->primary->fb;
> + fb = plane_state->fb;
>
> vfb = (fb) ? vmw_framebuffer_to_vfb(fb) : NULL;
>
> --
> 2.16.1
>
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