From d5d8043c8bda521ed3fb5c381c750f685371f526 Mon Sep 17 00:00:00 2001
From: Jernej Skrabec <jernej.skrabec@gmail.com>
Date: Sun, 24 Apr 2022 11:26:24 -0500
Subject: sun4i/drm: engine: Add mode_set callback
Git-commit: f7e974a31881957148110d3cc52774a4e279ef84
Patch-mainline: v5.19-rc1
References: jsc#PED-1166 jsc#PED-1168 jsc#PED-1170 jsc#PED-1218 jsc#PED-1220 jsc#PED-1222 jsc#PED-1223 jsc#PED-1225

This optional callback is useful for setting properties which depends
only on current mode. Such properties are width, height and interlaced
output.

These properties are currently set in update layer callback for primary
plane which is less than ideal. More about that in follow up patches,
which will migrate that code to this newly defined callback.

Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Signed-off-by: Samuel Holland <samuel@sholland.org>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://patchwork.freedesktop.org/patch/msgid/20220424162633.12369-7-samuel@sholland.org
Acked-by: Patrik Jakobsson <pjakobsson@suse.de>
---
 drivers/gpu/drm/sun4i/sun4i_crtc.c   |  1 +
 drivers/gpu/drm/sun4i/sunxi_engine.h | 27 +++++++++++++++++++++++++++
 2 files changed, 28 insertions(+)

diff --git a/drivers/gpu/drm/sun4i/sun4i_crtc.c b/drivers/gpu/drm/sun4i/sun4i_crtc.c
index 45d9eb552d86..c06d7cd45388 100644
--- a/drivers/gpu/drm/sun4i/sun4i_crtc.c
+++ b/drivers/gpu/drm/sun4i/sun4i_crtc.c
@@ -146,6 +146,7 @@ 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);
+	sunxi_engine_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..ec8cf9b2bda4 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 set mode related parameters
+	 * like interlacing, screen size, etc. once per mode set.
+	 *
+	 * This function is optional.
+	 */
+	void (*mode_set)(struct sunxi_engine *engine,
+			 const struct drm_display_mode *mode);
 };
 
 /**
@@ -181,4 +193,19 @@ sunxi_engine_disable_color_correction(struct sunxi_engine *engine)
 	if (engine->ops && engine->ops->disable_color_correction)
 		engine->ops->disable_color_correction(engine);
 }
+
+/**
+ * sunxi_engine_mode_set - Inform engine of a new mode
+ * @engine:	pointer to the engine
+ * @mode:	new mode
+ *
+ * Engine can use this functionality to set specifics once per mode change.
+ */
+static inline void
+sunxi_engine_mode_set(struct sunxi_engine *engine,
+		      const struct drm_display_mode *mode)
+{
+	if (engine->ops && engine->ops->mode_set)
+		engine->ops->mode_set(engine, mode);
+}
 #endif /* _SUNXI_ENGINE_H_ */
-- 
2.38.1