[PATCH v2 06/12] drm/sun4i: engine: Create an atomic_begin callback

From: Maxime Ripard
Date: Mon Dec 18 2017 - 09:58:18 EST


We have to implement some display engine specific behaviours in
atomic_begin. Let's add a function for that.

Signed-off-by: Maxime Ripard <maxime.ripard@xxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/sun4i/sun4i_crtc.c | 6 +++++-
drivers/gpu/drm/sun4i/sunxi_engine.h | 13 +++++++++++++
2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/sun4i/sun4i_crtc.c b/drivers/gpu/drm/sun4i/sun4i_crtc.c
index 2a565325714f..f549f2874353 100644
--- a/drivers/gpu/drm/sun4i/sun4i_crtc.c
+++ b/drivers/gpu/drm/sun4i/sun4i_crtc.c
@@ -64,6 +64,7 @@ static void sun4i_crtc_atomic_begin(struct drm_crtc *crtc,
{
struct sun4i_crtc *scrtc = drm_crtc_to_sun4i_crtc(crtc);
struct drm_device *dev = crtc->dev;
+ struct sunxi_engine *engine = scrtc->engine;
unsigned long flags;

if (crtc->state->event) {
@@ -73,7 +74,10 @@ static void sun4i_crtc_atomic_begin(struct drm_crtc *crtc,
scrtc->event = crtc->state->event;
spin_unlock_irqrestore(&dev->event_lock, flags);
crtc->state->event = NULL;
- }
+ }
+
+ if (engine->ops->atomic_begin)
+ engine->ops->atomic_begin(engine, old_state);
}

static void sun4i_crtc_atomic_flush(struct drm_crtc *crtc,
diff --git a/drivers/gpu/drm/sun4i/sunxi_engine.h b/drivers/gpu/drm/sun4i/sunxi_engine.h
index b810c26d78bb..ec4d54f596d4 100644
--- a/drivers/gpu/drm/sun4i/sunxi_engine.h
+++ b/drivers/gpu/drm/sun4i/sunxi_engine.h
@@ -33,6 +33,19 @@ struct sunxi_engine_ops {
void (*apply_color_correction)(struct sunxi_engine *engine);

/**
+ * @atomic_begin:
+ *
+ * This callback allows to prepare our backend for an atomic
+ * update. This is mirroring the
+ * &drm_crtc_helper_funcs.atomic_begin callback, so any
+ * documentation there applies.
+ *
+ * This function is optional.
+ */
+ void (*atomic_begin)(struct sunxi_engine *engine,
+ struct drm_crtc_state *old_state);
+
+ /**
* @atomic_check:
*
* This callback allows to validate plane-update related CRTC
--
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