[PATCH v3 11/11] drm/tilcdc: Enable frame done irq and functionality for LCDC rev 1

[Jyri Sarha]

We should wait for the last frame to complete before shutting things
down also on LCDC rev 1.

Signed-off-by: Jyri Sarha <jsarha at ti.com>
---
 drivers/gpu/drm/tilcdc/tilcdc_crtc.c | 34 +++++++++++++++++-----------------
 drivers/gpu/drm/tilcdc/tilcdc_regs.h |  1 +
 2 files changed, 18 insertions(+), 17 deletions(-)

diff --git a/drivers/gpu/drm/tilcdc/tilcdc_crtc.c b/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
index 1a1ff8d..f251546 100644
--- a/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
+++ b/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
@@ -183,7 +183,7 @@ static void tilcdc_crtc_enable_irqs(struct drm_device *dev)
 
 	if (priv->rev == 1) {
 		tilcdc_set(dev, LCDC_RASTER_CTRL_REG,
-			LCDC_V1_SYNC_LOST_ENA |
+			LCDC_V1_SYNC_LOST_ENA | LCDC_V1_FRAME_DONE_ENA |
 			LCDC_V1_UNDERFLOW_INT_ENA);
 		tilcdc_set(dev, LCDC_DMA_CTRL_REG,
 			LCDC_V1_END_OF_FRAME_INT_ENA);
@@ -201,7 +201,8 @@ static void tilcdc_crtc_disable_irqs(struct drm_device *dev)
 
 	/* disable irqs that we might have enabled: */
 	if (priv->rev == 1) {
-		tilcdc_clear(dev, LCDC_RASTER_CTRL_REG, LCDC_V1_SYNC_LOST_ENA |
+		tilcdc_clear(dev, LCDC_RASTER_CTRL_REG,
+			LCDC_V1_SYNC_LOST_ENA | LCDC_V1_FRAME_DONE_ENA |
 			LCDC_V1_UNDERFLOW_INT_ENA | LCDC_V1_PL_INT_ENA);
 		tilcdc_clear(dev, LCDC_DMA_CTRL_REG,
 			LCDC_V1_END_OF_FRAME_INT_ENA);
@@ -261,6 +262,7 @@ static void tilcdc_crtc_off(struct drm_crtc *crtc, bool shutdown)
 	struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
 	struct drm_device *dev = crtc->dev;
 	struct tilcdc_drm_private *priv = dev->dev_private;
+	int ret;
 
 	mutex_lock(&tilcdc_crtc->enable_lock);
 	if (shutdown)
@@ -273,17 +275,15 @@ static void tilcdc_crtc_off(struct drm_crtc *crtc, bool shutdown)
 	tilcdc_clear(dev, LCDC_RASTER_CTRL_REG, LCDC_RASTER_ENABLE);
 
 	/*
-	 * if necessary wait for framedone irq which will still come
-	 * before putting things to sleep..
+	 * Wait for framedone irq which will still come before putting
+	 * things to sleep..
 	 */
-	if (priv->rev == 2) {
-		int ret = wait_event_timeout(tilcdc_crtc->frame_done_wq,
-					     tilcdc_crtc->frame_done,
-					     msecs_to_jiffies(500));
-		if (ret == 0)
-			dev_err(dev->dev, "%s: timeout waiting for framedone\n",
-				__func__);
-	}
+	ret = wait_event_timeout(tilcdc_crtc->frame_done_wq,
+				 tilcdc_crtc->frame_done,
+				 msecs_to_jiffies(500));
+	if (ret == 0)
+		dev_err(dev->dev, "%s: timeout waiting for framedone\n",
+			__func__);
 
 	drm_crtc_vblank_off(crtc);
 
@@ -938,13 +938,13 @@ irqreturn_t tilcdc_crtc_irq(struct drm_crtc *crtc)
 		}
 	}
 
+	if (stat & LCDC_FRAME_DONE) {
+		tilcdc_crtc->frame_done = true;
+		wake_up(&tilcdc_crtc->frame_done_wq);
+	}
+
 	/* For revision 2 only */
 	if (priv->rev == 2) {
-		if (stat & LCDC_FRAME_DONE) {
-			tilcdc_crtc->frame_done = true;
-			wake_up(&tilcdc_crtc->frame_done_wq);
-		}
-
 		/* Indicate to LCDC that the interrupt service routine has
 		 * completed, see 13.3.6.1.6 in AM335x TRM.
 		 */
diff --git a/drivers/gpu/drm/tilcdc/tilcdc_regs.h b/drivers/gpu/drm/tilcdc/tilcdc_regs.h
index 56dbfbd..4e6975a 100644
--- a/drivers/gpu/drm/tilcdc/tilcdc_regs.h
+++ b/drivers/gpu/drm/tilcdc/tilcdc_regs.h
@@ -67,6 +67,7 @@
 #define LCDC_V1_PL_INT_ENA                       BIT(4)
 #define LCDC_V2_PL_INT_ENA                       BIT(6)
 #define LCDC_V1_SYNC_LOST_ENA                    BIT(5)
+#define LCDC_V1_FRAME_DONE_ENA                   BIT(3)
 #define LCDC_MONOCHROME_MODE                     BIT(1)
 #define LCDC_RASTER_ENABLE                       BIT(0)
 #define LCDC_TFT_ALT_ENABLE                      BIT(23)
-- 
1.9.1