[PATCH v1] drm/xe: avoid the async_flip update in the initial plane config

[Hogander, Jouni]

On Fri, 2024-04-19 at 17:09 +0300, Vinod Govindapillai wrote:
> Async flip call is not needed. The updated fb mapping is updated
> as part of the fixup_initial_plane_config() call. Otherwise we
> end up updating the PLAN_SURF register twice with the same info.

async_flip is writing PLANE_CTL as well. Is it ok to leave that out?

BR,

Jouni Högander

> 
> v2: avoid async_flip instead of removing fixup call (Ville)
> 
> Signed-off-by: Vinod Govindapillai <vinod.govindapillai at intel.com>
> ---
>  drivers/gpu/drm/xe/display/xe_plane_initial.c | 10 ----------
>  1 file changed, 10 deletions(-)
> 
> diff --git a/drivers/gpu/drm/xe/display/xe_plane_initial.c
> b/drivers/gpu/drm/xe/display/xe_plane_initial.c
> index 9693c56d386b..b5f8381b593d 100644
> --- a/drivers/gpu/drm/xe/display/xe_plane_initial.c
> +++ b/drivers/gpu/drm/xe/display/xe_plane_initial.c
> @@ -189,8 +189,6 @@ intel_find_initial_plane_obj(struct intel_crtc
> *crtc,
>                 to_intel_plane(crtc->base.primary);
>         struct intel_plane_state *plane_state =
>                 to_intel_plane_state(plane->base.state);
> -       struct intel_crtc_state *crtc_state =
> -               to_intel_crtc_state(crtc->base.state);
>         struct drm_framebuffer *fb;
>         struct i915_vma *vma;
>  
> @@ -236,14 +234,6 @@ intel_find_initial_plane_obj(struct intel_crtc
> *crtc,
>         atomic_or(plane->frontbuffer_bit, &to_intel_frontbuffer(fb)-
> >bits);
>  
>         plane_config->vma = vma;
> -
> -       /*
> -        * Flip to the newly created mapping ASAP, so we can re-use
> the
> -        * first part of GGTT for WOPCM, prevent flickering, and
> prevent
> -        * the lookup of sysmem scratch pages.
> -        */
> -       plane->check_plane(crtc_state, plane_state);
> -       plane->async_flip(plane, crtc_state, plane_state, true);
>         return;
>  
>  nofb: