[linux-sunxi] [PATCH v4 1/2] drm/sun4i: Add mode_set callback to the engine

[Roman Stratiienko]

Create callback to allow updating engine's registers on mode change.

Signed-off-by: Roman Stratiienko <r.stratiie...@gmail.com>
Reviewed-by: Jernej Skrabec <jernej.skra...@siol.net>
---
 drivers/gpu/drm/sun4i/sun4i_crtc.c   |  3 +++
 drivers/gpu/drm/sun4i/sunxi_engine.h | 12 ++++++++++++
 2 files changed, 15 insertions(+)

diff --git a/drivers/gpu/drm/sun4i/sun4i_crtc.c 
b/drivers/gpu/drm/sun4i/sun4i_crtc.c
index 45d9eb552d86..8f01a6b2bbef 100644
--- a/drivers/gpu/drm/sun4i/sun4i_crtc.c
+++ b/drivers/gpu/drm/sun4i/sun4i_crtc.c
@@ -146,6 +146,9 @@ static void sun4i_crtc_mode_set_nofb(struct drm_crtc *crtc)
        struct sun4i_crtc *scrtc = drm_crtc_to_sun4i_crtc(crtc);
 
        sun4i_tcon_mode_set(scrtc->tcon, encoder, mode);
+
+       if (scrtc->engine->ops->mode_set)
+               scrtc->engine->ops->mode_set(scrtc->engine, mode);
 }
 
 static const struct drm_crtc_helper_funcs sun4i_crtc_helper_funcs = {
diff --git a/drivers/gpu/drm/sun4i/sunxi_engine.h 
b/drivers/gpu/drm/sun4i/sunxi_engine.h
index 548710a936d5..7faa844646ff 100644
--- a/drivers/gpu/drm/sun4i/sunxi_engine.h
+++ b/drivers/gpu/drm/sun4i/sunxi_engine.h
@@ -9,6 +9,7 @@
 struct drm_plane;
 struct drm_device;
 struct drm_crtc_state;
+struct drm_display_mode;
 
 struct sunxi_engine;
 
@@ -108,6 +109,17 @@ struct sunxi_engine_ops {
         * This function is optional.
         */
        void (*vblank_quirk)(struct sunxi_engine *engine);
+
+       /**
+        * @mode_set:
+        *
+        * This callback is used to update engine registers that
+        * responsible for display frame size and other mode attributes.
+        *
+        * This function is optional.
+        */
+       void (*mode_set)(struct sunxi_engine *engine,
+                        struct drm_display_mode *mode);
 };
 
 /**
-- 
2.30.2

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