[PATCH 18/21] drm/tilcdc: Fix interrupt enable/disable code for version 2 tilcdc

[Jyri Sarha]

Fix interrupt enable/disable code for version 2 tilcdc. In version 2
tilcdc there is a separate register for disabling interrupts. Writing
0 to enable registers bits does not have any effect. The interrupt
clear register works the same way, writing 1 to specific bit disables
the interrupt and writing 0 does not have any effect.

The "bug" that is fixed here does not really do any harm since the
interrupts are enabled only once in the power up and disabled before
power down.

Signed-off-by: Jyri Sarha <jsarha at ti.com>
---
 drivers/gpu/drm/tilcdc/tilcdc_drv.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/tilcdc/tilcdc_drv.c b/drivers/gpu/drm/tilcdc/tilcdc_drv.c
index 41c8c96..8ae19e3 100644
--- a/drivers/gpu/drm/tilcdc/tilcdc_drv.c
+++ b/drivers/gpu/drm/tilcdc/tilcdc_drv.c
@@ -390,13 +390,14 @@ static int tilcdc_irq_postinstall(struct drm_device *dev)
 	struct tilcdc_drm_private *priv = dev->dev_private;
 
 	/* enable FIFO underflow irq: */
-	if (priv->rev == 1)
+	if (priv->rev == 1) {
 		tilcdc_set(dev, LCDC_RASTER_CTRL_REG, LCDC_V1_UNDERFLOW_INT_ENA);
-	else
-		tilcdc_set(dev, LCDC_INT_ENABLE_SET_REG,
+	} else {
+		tilcdc_write(dev, LCDC_INT_ENABLE_SET_REG,
 			   LCDC_V2_UNDERFLOW_INT_ENA |
 			   LCDC_V2_END_OF_FRAME0_INT_ENA |
 			   LCDC_FRAME_DONE);
+	}
 
 	return 0;
 }
@@ -411,7 +412,7 @@ static void tilcdc_irq_uninstall(struct drm_device *dev)
 				LCDC_V1_UNDERFLOW_INT_ENA | LCDC_V1_PL_INT_ENA);
 		tilcdc_clear(dev, LCDC_DMA_CTRL_REG, LCDC_V1_END_OF_FRAME_INT_ENA);
 	} else {
-		tilcdc_clear(dev, LCDC_INT_ENABLE_SET_REG,
+		tilcdc_write(dev, LCDC_INT_ENABLE_CLR_REG,
 			LCDC_V2_UNDERFLOW_INT_ENA | LCDC_V2_PL_INT_ENA |
 			LCDC_V2_END_OF_FRAME0_INT_ENA |
 			LCDC_FRAME_DONE);
@@ -456,7 +457,7 @@ static const struct {
 		REG(2, false, LCDC_INT_ENABLE_CLR_REG),
 		REG(2, false, LCDC_END_OF_INT_IND_REG),
 		REG(2, true,  LCDC_CLK_ENABLE_REG),
-		REG(2, true,  LCDC_INT_ENABLE_SET_REG),
+		REG(2, true, LCDC_INT_ENABLE_SET_REG),
 #undef REG
 };
 
-- 
1.9.1