[PATCH 12/18] drm/amd/display: Allow commits with no planes active

[sunpeng.li at amd.com]

From: Nicholas Kazlauskas <nicholas.kazlauskas at amd.com>

[Why]
Many userspace applications (and IGT) seem to expect that most drivers
can keep a CRTC active and enabled if there are no primary or overlay
planes.

DC is setup to handle this but only in the case where there are
absolutely no planes on the CRTC - no primary, cursor, or overlay.

[How]
Add a check to reject commits that have cursor planes enabled and
nothing else on CRTCs since we can't handle that. The new helper
does_crtc_have_active_cursor is used for this.

In atomic commit tail, we need to let DC know that there are zero
planes enabled when doing stream updates to let it disable and blank
pipes as appropriate.

Change-Id: Ie3b92755aecba8bb825bbe00772f5bbccc86bff1
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas at amd.com>
Reviewed-by: David Francis <David.Francis at amd.com>
Acked-by: Leo Li <sunpeng.li at amd.com>
---
 drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 22 ++++++++++++++++++++--
 1 file changed, 20 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index c48306f..9933aee 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -3950,6 +3950,19 @@ static void dm_crtc_helper_disable(struct drm_crtc *crtc)
 {
 }
 
+static bool does_crtc_have_active_cursor(struct drm_crtc_state *new_crtc_state)
+{
+	struct drm_device *dev = new_crtc_state->crtc->dev;
+	struct drm_plane *plane;
+
+	drm_for_each_plane_mask(plane, dev, new_crtc_state->plane_mask) {
+		if (plane->type == DRM_PLANE_TYPE_CURSOR)
+			return true;
+	}
+
+	return false;
+}
+
 static int count_crtc_active_planes(struct drm_crtc_state *new_crtc_state)
 {
 	struct drm_atomic_state *state = new_crtc_state->state;
@@ -4033,8 +4046,12 @@ static int dm_crtc_helper_atomic_check(struct drm_crtc *crtc,
 	if (!dm_crtc_state->stream)
 		return 0;
 
-	/* We want at least one hardware plane enabled to use the stream. */
+	/*
+	 * We want at least one hardware plane enabled to use
+	 * the stream with a cursor enabled.
+	 */
 	if (state->enable && state->active &&
+	    does_crtc_have_active_cursor(state) &&
 	    dm_crtc_state->active_planes == 0)
 		return -EINVAL;
 
@@ -5479,7 +5496,8 @@ static void amdgpu_dm_commit_planes(struct drm_atomic_state *state,
 		}
 	}
 
-	if (planes_count) {
+	/* Update the planes if changed or disable if we don't have any. */
+	if (planes_count || acrtc_state->active_planes == 0) {
 		if (new_pcrtc_state->mode_changed) {
 			bundle->stream_update.src = acrtc_state->stream->src;
 			bundle->stream_update.dst = acrtc_state->stream->dst;
-- 
2.7.4