[PATCH v4 10/10] 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 | 18 +++++++++++-------
 drivers/gpu/drm/tilcdc/tilcdc_regs.h |  1 +
 2 files changed, 12 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/tilcdc/tilcdc_crtc.c 
b/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
index fb24422..9942b05 100644
--- a/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
+++ b/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
@@ -171,7 +171,7 @@ 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_INT_ENA |
+                       LCDC_V1_SYNC_LOST_INT_ENA | LCDC_V1_FRAME_DONE_INT_ENA |
                        LCDC_V1_UNDERFLOW_INT_ENA);
                tilcdc_set(dev, LCDC_DMA_CTRL_REG,
                        LCDC_V1_END_OF_FRAME_INT_ENA);
@@ -190,7 +190,7 @@ 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_INT_ENA |
+                       LCDC_V1_SYNC_LOST_INT_ENA | LCDC_V1_FRAME_DONE_INT_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);
@@ -935,13 +935,17 @@ 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);
+               /* rev 1 lcdc appears to hang if irq is not disbaled here */
+               if (priv->rev == 1)
+                       tilcdc_clear(dev, LCDC_RASTER_CTRL_REG,
+                                    LCDC_V1_FRAME_DONE_INT_ENA);
+       }
+
        /* 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 d69a940..9d528c0 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_INT_ENA                BIT(5)
+#define LCDC_V1_FRAME_DONE_INT_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