drm/exynos: Don't keep dpms state in encoder

This patch removes the dpms state tracking in encoder. This
state is at best confusing and at worst incorrect since the display
drivers can turn on and off without propagating the value.
Signed-off-by: NSean Paul <seanpaul@chromium.org>
Reviewed-by: NTomasz Figa <t.figa@samsung.com>
Signed-off-by: NInki Dae <inki.dae@samsung.com>

drivers/gpu/drm/exynos/exynos_drm_encoder.c

@@ -28,32 +28,22 @@
  * @drm_encoder: encoder object.
  * @manager: specific encoder has its own manager to control a hardware
  *	appropriately and we can access a hardware drawing on this manager.
- * @dpms: store the encoder dpms value.
  */
 struct exynos_drm_encoder {
 	struct drm_crtc			*old_crtc;
 	struct drm_encoder		drm_encoder;
 	struct exynos_drm_manager	*manager;
-	int				dpms;
 };
 
 static void exynos_drm_encoder_dpms(struct drm_encoder *encoder, int mode)
 {
 	struct exynos_drm_manager *manager = exynos_drm_get_manager(encoder);
-	struct exynos_drm_encoder *exynos_encoder = to_exynos_encoder(encoder);
 	struct exynos_drm_display_ops *display_ops = manager->display_ops;
 
 	DRM_DEBUG_KMS("encoder dpms: %d\n", mode);
 
-	if (exynos_encoder->dpms == mode) {
-		DRM_DEBUG_KMS("desired dpms mode is same as previous one.\n");
-		return;
-	}
-
 	if (display_ops && display_ops->dpms)
 		display_ops->dpms(manager->ctx, mode);
-
-	exynos_encoder->dpms = mode;
 }
 
 static bool
@@ -157,12 +147,6 @@ static void exynos_drm_encoder_commit(struct drm_encoder *encoder)
 
 	if (manager_ops && manager_ops->commit)
 		manager_ops->commit(manager);
-
-	/*
-	 * In case of setcrtc, there is no way to update encoder's dpms
-	 * so update it here.
-	 */
-	exynos_encoder->dpms = DRM_MODE_DPMS_ON;
 }
 
 void exynos_drm_encoder_complete_scanout(struct drm_framebuffer *fb)
@@ -281,7 +265,6 @@ exynos_drm_encoder_create(struct drm_device *dev,
 	if (!exynos_encoder)
 		return NULL;
 
-	exynos_encoder->dpms = DRM_MODE_DPMS_OFF;
 	exynos_encoder->manager = manager;
 	encoder = &exynos_encoder->drm_encoder;
 	encoder->possible_crtcs = possible_crtcs;