Re: [PATCH] Fixes: fc2a69f3903d ("drm/atomic: Handling the case when, setting old crtc for plane")

[Jani Nikula <jani.nikula@linux.intel.com>]

Subject: Revert "drm/atomic: Handling the case when setting old crtc for plane"

On Wed, 05 Sep 2018, Karsten Hohmeier <karsten@hohmatik.de> wrote:
> Original commit causes "plane A assertion failure" on lid close/lid open
> with older HP Compaq 6720s laptops (Intel Mobile GME965/GLE960).
> Full bug report at "https://bugs.freedesktop.org/show_bug.cgi?id=107827".

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=107827
Fixes: fc2a69f3903d ("drm/atomic: Handling the case when setting old crtc for plane")
Cc: Satendra Singh Thakur <satendra.t@samsung.com>
Cc: Madhur Verma <madhur.verma@samsung.com>
Cc: Hemanshu Srivastava <hemanshu.s@samsung.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Gustavo Padovan <gustavo@padovan.org>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Sean Paul <seanpaul@chromium.org>
Cc: David Airlie <airlied@linux.ie>
Cc: dri-devel@lists.freedesktop.org
Cc: <stable@vger.kernel.org> # v4.18+

> ---
>  drivers/gpu/drm/drm_atomic.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
> index 895741e9cd7d..a59ded403657 100644
> --- a/drivers/gpu/drm/drm_atomic.c
> +++ b/drivers/gpu/drm/drm_atomic.c
> @@ -1433,9 +1433,7 @@ drm_atomic_set_crtc_for_plane(struct
> drm_plane_state *plane_state,
>  {
>  	struct drm_plane *plane = plane_state->plane;
>  	struct drm_crtc_state *crtc_state;
> -	/* Nothing to do for same crtc*/
> -	if (plane_state->crtc == crtc)
> -		return 0;
> +
>  	if (plane_state->crtc) {
>  		crtc_state = drm_atomic_get_crtc_state(plane_state->state,
>  						       plane_state->crtc);
> --
> 2.11.0
>
>
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-- 
Jani Nikula, Intel Open Source Graphics Center