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[v3,06/13] drm/sun4i: engine: Add a VBLANK quirk callback

Message ID 7c298d43aa1500196aa5d15d7a7c0f228c7a6f3c.1515492513.git-series.maxime.ripard@free-electrons.com
State Accepted
Commit 3004f75fd4732a67ba1bd069a209957f3b3394d2
Headers show
Series [v3,01/13] drm/sun4i: backend: Move line stride setup to buffer setup function | expand

Commit Message

Maxime Ripard Jan. 9, 2018, 10:09 a.m. UTC 
In some cases, the display engine needs to apply some quirks during the
VBLANK event. In the Display Engine 1.0 case for example, we can only
disable the frontend once the backend has been, which is at VBLANK.

Let's introduce a callback that can be implemented by the various engines.

Reviewed-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
---
 drivers/gpu/drm/sun4i/sun4i_tcon.c   |  4 ++++
 drivers/gpu/drm/sun4i/sunxi_engine.h | 13 +++++++++++++
 2 files changed, 17 insertions(+)
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Patch

diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c b/drivers/gpu/drm/sun4i/sun4i_tcon.c
index e122f5b2a395..55f54b54293c 100644
--- a/drivers/gpu/drm/sun4i/sun4i_tcon.c
+++ b/drivers/gpu/drm/sun4i/sun4i_tcon.c
@@ -368,6 +368,7 @@  static irqreturn_t sun4i_tcon_handler(int irq, void *private)
 	struct sun4i_tcon *tcon = private;
 	struct drm_device *drm = tcon->drm;
 	struct sun4i_crtc *scrtc = tcon->crtc;
+	struct sunxi_engine *engine = scrtc->engine;
 	unsigned int status;
 
 	regmap_read(tcon->regs, SUN4I_TCON_GINT0_REG, &status);
@@ -385,6 +386,9 @@  static irqreturn_t sun4i_tcon_handler(int irq, void *private)
 			   SUN4I_TCON_GINT0_VBLANK_INT(1),
 			   0);
 
+	if (engine->ops->vblank_quirk)
+		engine->ops->vblank_quirk(engine);
+
 	return IRQ_HANDLED;
 }
 
diff --git a/drivers/gpu/drm/sun4i/sunxi_engine.h b/drivers/gpu/drm/sun4i/sunxi_engine.h
index b819d4f9f02f..54c029877531 100644
--- a/drivers/gpu/drm/sun4i/sunxi_engine.h
+++ b/drivers/gpu/drm/sun4i/sunxi_engine.h
@@ -85,6 +85,19 @@  struct sunxi_engine_ops {
 	 * This function is optional.
 	 */
 	void (*disable_color_correction)(struct sunxi_engine *engine);
+
+	/**
+	 * @vblank_quirk:
+	 *
+	 * This callback is used to implement engine-specific
+	 * behaviour part of the VBLANK event. It is run with all the
+	 * constraints of an interrupt (can't sleep, all local
+	 * interrupts disabled) and therefore should be as fast as
+	 * possible.
+	 *
+	 * This function is optional.
+	 */
+	void (*vblank_quirk)(struct sunxi_engine *engine);
 };
 
 /**