drm/tidss: Use simple encoder

The tidss driver uses an empty implementation for its encoder. Replace
the code with the generic simple encoder.
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Acked-by: Jyri Sarha <jsarha@ti.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200305155950.2705-17-tzimmermann@suse.de

drivers/gpu/drm/tidss/tidss_encoder.c

@@ -8,8 +8,9 @@
 
 #include <drm/drm_crtc.h>
 #include <drm/drm_crtc_helper.h>
-#include <drm/drm_panel.h>
 #include <drm/drm_of.h>
+#include <drm/drm_panel.h>
+#include <drm/drm_simple_kms_helper.h>
 
 #include "tidss_crtc.h"
 #include "tidss_drv.h"
@@ -59,10 +60,6 @@ static const struct drm_encoder_helper_funcs encoder_helper_funcs = {
 	.atomic_check = tidss_encoder_atomic_check,
 };
 
-static const struct drm_encoder_funcs encoder_funcs = {
-	.destroy = drm_encoder_cleanup,
-};
-
 struct drm_encoder *tidss_encoder_create(struct tidss_device *tidss,
 					 u32 encoder_type, u32 possible_crtcs)
 {
@@ -75,8 +72,7 @@ struct drm_encoder *tidss_encoder_create(struct tidss_device *tidss,
 
 	enc->possible_crtcs = possible_crtcs;
 
-	ret = drm_encoder_init(&tidss->ddev, enc, &encoder_funcs,
-			       encoder_type, NULL);
+	ret = drm_simple_encoder_init(&tidss->ddev, enc, encoder_type);
 	if (ret < 0)
 		return ERR_PTR(ret);