drm/rockchip: Don't key off vblank for psr

Instead of keying off vblank for psr, just flush every time
we get an atomic update. This ensures that cursor updates
will properly disable psr (without turning vblank on/off),
and unifies the paths between fb_dirty and atomic psr
enable/disable.

Reviewed-by: Yakir Yang <ykk@rock-chips.com>
Signed-off-by: Sean Paul <seanpaul@chromium.org>

drivers/gpu/drm/rockchip/rockchip_drm_fb.c

@@ -70,7 +70,7 @@ static int rockchip_drm_fb_dirty(struct drm_framebuffer *fb,
 				 struct drm_clip_rect *clips,
 				 unsigned int num_clips)
 {
-	rockchip_drm_psr_flush(fb->dev);
+	rockchip_drm_psr_flush_all(fb->dev);
 	return 0;
 }
 

drivers/gpu/drm/rockchip/rockchip_drm_psr.c

@@ -31,6 +31,7 @@ struct psr_drv {
 	struct drm_encoder	*encoder;
 
 	spinlock_t		lock;
+	bool			active;
 	enum psr_state		state;
 
 	struct timer_list	flush_timer;
@@ -67,11 +68,7 @@ static void psr_set_state_locked(struct psr_drv *psr, enum psr_state state)
 	 *       v |                        |
 	 *   PSR_DISABLE < - - - - - - - - -
 	 */
-	if (state == psr->state)
-		return;
-
-	/* Requesting a flush when disabled is a noop */
-	if (state == PSR_FLUSH && psr->state == PSR_DISABLE)
+	if (state == psr->state || !psr->active)
 		return;
 
 	psr->state = state;
@@ -115,45 +112,79 @@ static void psr_flush_handler(unsigned long data)
 }
 
 /**
- * rockchip_drm_psr_enable - enable the encoder PSR which bind to given CRTC
+ * rockchip_drm_psr_activate - activate PSR on the given pipe
  * @crtc: CRTC to obtain the PSR encoder
  *
  * Returns:
  * Zero on success, negative errno on failure.
  */
-int rockchip_drm_psr_enable(struct drm_crtc *crtc)
+int rockchip_drm_psr_activate(struct drm_crtc *crtc)
 {
 	struct psr_drv *psr = find_psr_by_crtc(crtc);
+	unsigned long flags;
 
 	if (IS_ERR(psr))
 		return PTR_ERR(psr);
 
-	psr_set_state(psr, PSR_ENABLE);
+	spin_lock_irqsave(&psr->lock, flags);
+	psr->active = true;
+	spin_unlock_irqrestore(&psr->lock, flags);
+
 	return 0;
 }
-EXPORT_SYMBOL(rockchip_drm_psr_enable);
+EXPORT_SYMBOL(rockchip_drm_psr_activate);
 
 /**
- * rockchip_drm_psr_disable - disable the encoder PSR which bind to given CRTC
+ * rockchip_drm_psr_deactivate - deactivate PSR on the given pipe
  * @crtc: CRTC to obtain the PSR encoder
  *
  * Returns:
  * Zero on success, negative errno on failure.
  */
-int rockchip_drm_psr_disable(struct drm_crtc *crtc)
+int rockchip_drm_psr_deactivate(struct drm_crtc *crtc)
 {
 	struct psr_drv *psr = find_psr_by_crtc(crtc);
+	unsigned long flags;
+
+	if (IS_ERR(psr))
+		return PTR_ERR(psr);
+
+	spin_lock_irqsave(&psr->lock, flags);
+	psr->active = false;
+	spin_unlock_irqrestore(&psr->lock, flags);
+	del_timer_sync(&psr->flush_timer);
+
+	return 0;
+}
+EXPORT_SYMBOL(rockchip_drm_psr_deactivate);
+
+static void rockchip_drm_do_flush(struct psr_drv *psr)
+{
+	mod_timer(&psr->flush_timer,
+		  round_jiffies_up(jiffies + PSR_FLUSH_TIMEOUT));
+	psr_set_state(psr, PSR_FLUSH);
+}
 
+/**
+ * rockchip_drm_psr_flush - flush a single pipe
+ * @crtc: CRTC of the pipe to flush
+ *
+ * Returns:
+ * 0 on success, -errno on fail
+ */
+int rockchip_drm_psr_flush(struct drm_crtc *crtc)
+{
+	struct psr_drv *psr = find_psr_by_crtc(crtc);
 	if (IS_ERR(psr))
 		return PTR_ERR(psr);
 
-	psr_set_state(psr, PSR_DISABLE);
+	rockchip_drm_do_flush(psr);
 	return 0;
 }
-EXPORT_SYMBOL(rockchip_drm_psr_disable);
+EXPORT_SYMBOL(rockchip_drm_psr_flush);
 
 /**
- * rockchip_drm_psr_flush - force to flush all registered PSR encoders
+ * rockchip_drm_psr_flush_all - force to flush all registered PSR encoders
  * @dev: drm device
  *
  * Disable the PSR function for all registered encoders, and then enable the
@@ -164,22 +195,18 @@ EXPORT_SYMBOL(rockchip_drm_psr_disable);
  * Returns:
  * Zero on success, negative errno on failure.
  */
-void rockchip_drm_psr_flush(struct drm_device *dev)
+void rockchip_drm_psr_flush_all(struct drm_device *dev)
 {
 	struct rockchip_drm_private *drm_drv = dev->dev_private;
 	struct psr_drv *psr;
 	unsigned long flags;
 
 	spin_lock_irqsave(&drm_drv->psr_list_lock, flags);
-	list_for_each_entry(psr, &drm_drv->psr_list, list) {
-		mod_timer(&psr->flush_timer,
-			  round_jiffies_up(jiffies + PSR_FLUSH_TIMEOUT));
-
-		psr_set_state(psr, PSR_FLUSH);
-	}
+	list_for_each_entry(psr, &drm_drv->psr_list, list)
+		rockchip_drm_do_flush(psr);
 	spin_unlock_irqrestore(&drm_drv->psr_list_lock, flags);
 }
-EXPORT_SYMBOL(rockchip_drm_psr_flush);
+EXPORT_SYMBOL(rockchip_drm_psr_flush_all);
 
 /**
  * rockchip_drm_psr_register - register encoder to psr driver
@@ -206,6 +233,7 @@ int rockchip_drm_psr_register(struct drm_encoder *encoder,
 	setup_timer(&psr->flush_timer, psr_flush_handler, (unsigned long)psr);
 	spin_lock_init(&psr->lock);
 
+	psr->active = true;
 	psr->state = PSR_DISABLE;
 	psr->encoder = encoder;
 	psr->set = psr_set;

drivers/gpu/drm/rockchip/rockchip_drm_psr.h

@@ -15,9 +15,11 @@
 #ifndef __ROCKCHIP_DRM_PSR___
 #define __ROCKCHIP_DRM_PSR___
 
-void rockchip_drm_psr_flush(struct drm_device *dev);
-int rockchip_drm_psr_enable(struct drm_crtc *crtc);
-int rockchip_drm_psr_disable(struct drm_crtc *crtc);
+void rockchip_drm_psr_flush_all(struct drm_device *dev);
+int rockchip_drm_psr_flush(struct drm_crtc *crtc);
+
+int rockchip_drm_psr_activate(struct drm_crtc *crtc);
+int rockchip_drm_psr_deactivate(struct drm_crtc *crtc);
 
 int rockchip_drm_psr_register(struct drm_encoder *encoder,
 			void (*psr_set)(struct drm_encoder *, bool enable));

drivers/gpu/drm/rockchip/rockchip_drm_vop.c

@@ -569,6 +569,8 @@ static void vop_crtc_disable(struct drm_crtc *crtc)
 
 	WARN_ON(vop->event);
 
+	rockchip_drm_psr_deactivate(&vop->crtc);
+
 	/*
 	 * We need to make sure that all windows are disabled before we
 	 * disable that crtc. Otherwise we might try to scan from a destroyed
@@ -919,8 +921,6 @@ static int vop_crtc_enable_vblank(struct drm_crtc *crtc)
 
 	spin_unlock_irqrestore(&vop->irq_lock, flags);
 
-	rockchip_drm_psr_disable(&vop->crtc);
-
 	return 0;
 }
 
@@ -937,8 +937,6 @@ static void vop_crtc_disable_vblank(struct drm_crtc *crtc)
 	VOP_INTR_SET_TYPE(vop, enable, FS_INTR, 0);
 
 	spin_unlock_irqrestore(&vop->irq_lock, flags);
-
-	rockchip_drm_psr_enable(&vop->crtc);
 }
 
 static void vop_crtc_wait_for_update(struct drm_crtc *crtc)
@@ -1072,6 +1070,8 @@ static void vop_crtc_enable(struct drm_crtc *crtc)
 	clk_set_rate(vop->dclk, adjusted_mode->clock * 1000);
 
 	VOP_CTRL_SET(vop, standby, 0);
+
+	rockchip_drm_psr_activate(&vop->crtc);
 }
 
 static void vop_crtc_atomic_flush(struct drm_crtc *crtc,
@@ -1094,6 +1094,8 @@ static void vop_crtc_atomic_begin(struct drm_crtc *crtc,
 {
 	struct vop *vop = to_vop(crtc);
 
+	rockchip_drm_psr_flush(crtc);
+
 	spin_lock_irq(&crtc->dev->event_lock);
 	vop->vblank_active = true;
 	WARN_ON(drm_crtc_vblank_get(crtc) != 0);