[v4,4/4] drm/vkms: subclass CRTC state

Commit Message

Haneen Mohammed July 24, 2018, 4:31 p.m. UTC

Subclass CRTC state struct to enable storing driver's private
state. This patch only adds the base drm_crtc_state struct and
the atomic functions that handle it.

Signed-off-by: Haneen Mohammed <[e-mail]>
Reviewed-by: Daniel Vetter <[e-mail]>
Reviewed-by: Sean Paul <[e-mail]>
---
 drivers/gpu/drm/vkms/vkms_crtc.c | 53 ++++++++++++++++++++++++++++++--
 drivers/gpu/drm/vkms/vkms_drv.h  | 11 +++++++
 2 files changed, 61 insertions(+), 3 deletions(-)

Patch

diff --git a/drivers/gpu/drm/vkms/vkms_crtc.c b/drivers/gpu/drm/vkms/vkms_crtc.c
index 875fca662ac0..26babb85ca77 100644
--- a/drivers/gpu/drm/vkms/vkms_crtc.c
+++ b/drivers/gpu/drm/vkms/vkms_crtc.c
@@ -64,13 +64,60 @@  bool vkms_get_vblank_timestamp(struct drm_device *dev, unsigned int pipe,
 	return true;
 }
 
+static void vkms_atomic_crtc_reset(struct drm_crtc *crtc)
+{
+	struct vkms_crtc_state *vkms_state = NULL;
+
+	if (crtc->state) {
+		vkms_state = to_vkms_crtc_state(crtc->state);
+		__drm_atomic_helper_crtc_destroy_state(crtc->state);
+		kfree(vkms_state);
+		crtc->state = NULL;
+	}
+
+	vkms_state = kzalloc(sizeof(*vkms_state), GFP_KERNEL);
+	if (!vkms_state)
+		return;
+
+	crtc->state = &vkms_state->base;
+	crtc->state->crtc = crtc;
+}
+
+static struct drm_crtc_state *
+vkms_atomic_crtc_duplicate_state(struct drm_crtc *crtc)
+{
+	struct vkms_crtc_state *vkms_state;
+
+	if (WARN_ON(!crtc->state))
+		return NULL;
+
+	vkms_state = kzalloc(sizeof(*vkms_state), GFP_KERNEL);
+	if (!vkms_state)
+		return NULL;
+
+	__drm_atomic_helper_crtc_duplicate_state(crtc, &vkms_state->base);
+
+	return &vkms_state->base;
+}
+
+static void vkms_atomic_crtc_destroy_state(struct drm_crtc *crtc,
+					   struct drm_crtc_state *state)
+{
+	struct vkms_crtc_state *vkms_state;
+
+	vkms_state = to_vkms_crtc_state(state);
+
+	__drm_atomic_helper_crtc_destroy_state(state);
+	kfree(vkms_state);
+}
+
 static const struct drm_crtc_funcs vkms_crtc_funcs = {
 	.set_config             = drm_atomic_helper_set_config,
 	.destroy                = drm_crtc_cleanup,
 	.page_flip              = drm_atomic_helper_page_flip,
-	.reset                  = drm_atomic_helper_crtc_reset,
-	.atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
-	.atomic_destroy_state   = drm_atomic_helper_crtc_destroy_state,
+	.reset                  = vkms_atomic_crtc_reset,
+	.atomic_duplicate_state = vkms_atomic_crtc_duplicate_state,
+	.atomic_destroy_state   = vkms_atomic_crtc_destroy_state,
 	.enable_vblank		= vkms_enable_vblank,
 	.disable_vblank		= vkms_disable_vblank,
 };
diff --git a/drivers/gpu/drm/vkms/vkms_drv.h b/drivers/gpu/drm/vkms/vkms_drv.h
index 47048f707566..75e52d61e65d 100644
--- a/drivers/gpu/drm/vkms/vkms_drv.h
+++ b/drivers/gpu/drm/vkms/vkms_drv.h
@@ -20,6 +20,14 @@  static const u32 vkms_formats[] = {
 	DRM_FORMAT_XRGB8888,
 };
 
+/**
+ * vkms_crtc_state - Driver specific CRTC state
+ * @base: base CRTC state
+ */
+struct vkms_crtc_state {
+	struct drm_crtc_state base;
+};
+
 struct vkms_output {
 	struct drm_crtc crtc;
 	struct drm_encoder encoder;
@@ -52,6 +60,9 @@  struct vkms_gem_object {
 #define drm_gem_to_vkms_gem(target)\
 	container_of(target, struct vkms_gem_object, gem)
 
+#define to_vkms_crtc_state(target)\
+	container_of(target, struct vkms_crtc_state, base)
+
 /* CRTC */
 int vkms_crtc_init(struct drm_device *dev, struct drm_crtc *crtc,
 		   struct drm_plane *primary, struct drm_plane *cursor);