drm/msm: Suspend/Resume support for color processing features

Color processing features that are enabled by user-space clients need
to be saved when crtc goes to suspend. Once crtc resumes, the following
commit cycle will restore the features.

Change-Id: I2f169a744a5a19fe6456ff4832208a0cbe78be95
Signed-off-by: Gopikrishnaiah Anandan <agopik@codeaurora.org>

3 files changed, 56 insertions, 0 deletions

diff --git a/drivers/gpu/drm/msm/sde/sde_color_processing.c b/drivers/gpu/drm/msm/sde/sde_color_processing.c
index ec7d282eb24e..db9801a5afbb 100644
--- a/drivers/gpu/drm/msm/sde/sde_color_processing.c
+++ b/drivers/gpu/drm/msm/sde/sde_color_processing.c
@@ -430,6 +430,11 @@ void sde_cp_crtc_install_properties(struct drm_crtc *crtc)
 	}
 
 	sde_crtc = to_sde_crtc(crtc);
+	if (!sde_crtc) {
+		DRM_ERROR("sde_crtc %pK\n", sde_crtc);
+		return;
+	}
+
 	kms = get_kms(crtc);
 	if (!kms || !kms->catalog || !sde_crtc) {
 		DRM_ERROR("invalid sde kms %pK catalog %pK sde_crtc %pK\n",
@@ -638,3 +643,30 @@ void sde_cp_crtc_destroy_properties(struct drm_crtc *crtc)
 	INIT_LIST_HEAD(&sde_crtc->dirty_list);
 	INIT_LIST_HEAD(&sde_crtc->feature_list);
 }
+
+void sde_cp_crtc_suspend(struct drm_crtc *crtc)
+{
+	struct sde_crtc *sde_crtc = NULL;
+	struct sde_color_process_node *prop_node = NULL, *n = NULL;
+
+	if (!crtc) {
+		DRM_ERROR("crtc %pK\n", crtc);
+		return;
+	}
+	sde_crtc = to_sde_crtc(crtc);
+	if (!sde_crtc) {
+		DRM_ERROR("sde_crtc %pK\n", sde_crtc);
+		return;
+	}
+
+	list_for_each_entry_safe(prop_node, n, &sde_crtc->active_list,
+				 active_list) {
+		list_add_tail(&prop_node->dirty_list, &sde_crtc->dirty_list);
+		list_del_init(&prop_node->active_list);
+	}
+}
+
+void sde_cp_crtc_resume(struct drm_crtc *crtc)
+{
+	/* placeholder for operations needed during resume */
+}
diff --git a/drivers/gpu/drm/msm/sde/sde_color_processing.h b/drivers/gpu/drm/msm/sde/sde_color_processing.h
index d677c82ec931..1471130514f7 100644
--- a/drivers/gpu/drm/msm/sde/sde_color_processing.h
+++ b/drivers/gpu/drm/msm/sde/sde_color_processing.h
@@ -69,4 +69,16 @@ void sde_cp_crtc_apply_properties(struct drm_crtc *crtc);
  */
 int sde_cp_crtc_get_property(struct drm_crtc *crtc,
 				struct drm_property *property, uint64_t *val);
+
+/**
+ * sde_cp_crtc_suspend: Suspend the crtc features
+ * @crtc: Pointer to crtc.
+ */
+void sde_cp_crtc_suspend(struct drm_crtc *crtc);
+
+/**
+ * sde_cp_crtc_resume: Resume the crtc features
+ * @crtc: Pointer to crtc.
+ */
+void sde_cp_crtc_resume(struct drm_crtc *crtc);
 #endif /*_SDE_COLOR_PROCESSING_H */
diff --git a/drivers/gpu/drm/msm/sde/sde_crtc.c b/drivers/gpu/drm/msm/sde/sde_crtc.c
index 366c97e9c5c8..2a3c61c0ddeb 100644
--- a/drivers/gpu/drm/msm/sde/sde_crtc.c
+++ b/drivers/gpu/drm/msm/sde/sde_crtc.c
@@ -1149,6 +1149,16 @@ static int _sde_debugfs_mixer_open(struct inode *inode, struct file *file)
 	return single_open(file, _sde_debugfs_mixer_read, inode->i_private);
 }
 
+static void sde_crtc_suspend(struct drm_crtc *crtc)
+{
+	sde_cp_crtc_suspend(crtc);
+}
+
+static void sde_crtc_resume(struct drm_crtc *crtc)
+{
+	sde_cp_crtc_resume(crtc);
+}
+
 static const struct drm_crtc_funcs sde_crtc_funcs = {
 	.set_config = drm_atomic_helper_set_config,
 	.destroy = sde_crtc_destroy,
@@ -1159,6 +1169,8 @@ static const struct drm_crtc_funcs sde_crtc_funcs = {
 	.reset = sde_crtc_reset,
 	.atomic_duplicate_state = sde_crtc_duplicate_state,
 	.atomic_destroy_state = sde_crtc_destroy_state,
+	.save = sde_crtc_suspend,
+	.restore = sde_crtc_resume,
 };
 
 static const struct drm_crtc_helper_funcs sde_crtc_helper_funcs = {