[PATCH 09/11] drm/komeda: Add komeda_kms_check

["james qian wang (Arm Technology China)" <james.qian.wang@arm.com>]

Implement komeda_kms_check to add all affected_planes (even unchanged) to
drm_atomic_state. since komeda need to re-calculate the resources
assumption in every commit.

Signed-off-by: James (Qian) Wang <james.qian.wang@arm.com>
---
 .../gpu/drm/arm/display/komeda/komeda_kms.c   | 30 ++++++++++++++++++-
 1 file changed, 29 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_kms.c b/drivers/gpu/drm/arm/display/komeda/komeda_kms.c
index 210e5c05bf49..ae97db7e447e 100644
--- a/drivers/gpu/drm/arm/display/komeda/komeda_kms.c
+++ b/drivers/gpu/drm/arm/display/komeda/komeda_kms.c
@@ -95,9 +95,37 @@ static const struct drm_mode_config_helper_funcs komeda_mode_config_helpers = {
 	.atomic_commit_tail = komeda_kms_commit_tail,
 };
 
+static int komeda_kms_check(struct drm_device *dev,
+			    struct drm_atomic_state *state)
+{
+	struct drm_crtc *crtc;
+	struct drm_crtc_state *old_crtc_st, *new_crtc_st;
+	int i, err;
+
+	err = drm_atomic_helper_check_modeset(dev, state);
+	if (err)
+		return err;
+
+	/* komeda need to re-calculate resource assumption in every commit
+	 * so need to add all affected_planes (even unchanged) to
+	 * drm_atomic_state.
+	 */
+	for_each_oldnew_crtc_in_state(state, crtc, old_crtc_st, new_crtc_st, i) {
+		err = drm_atomic_add_affected_planes(state, crtc);
+		if (err)
+			return err;
+	}
+
+	err = drm_atomic_helper_check_planes(dev, state);
+	if (err)
+		return err;
+
+	return 0;
+}
+
 static const struct drm_mode_config_funcs komeda_mode_config_funcs = {
 	.fb_create		= komeda_fb_create,
-	.atomic_check		= NULL,/*komeda_kms_check*/
+	.atomic_check		= komeda_kms_check,
 	.atomic_commit		= drm_atomic_helper_commit,
 };
 
-- 
2.17.1