[v3,17/22] drm/tilcdc: Fix interrupt enable/disable code for version 2 tilcdc

Submitted by Jyri Sarha on Feb. 23, 2016, 3:03 p.m.

Details

Message ID ef4fa6eced099752140a95ad7a9e4c0edefc693a.1456239300.git.jsarha@ti.com
State New
Headers show
Series "drm/ticdc: Accumulated fixes over the past couple of years" ( rev: 2 ) in DRI devel

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Commit Message

Jyri Sarha Feb. 23, 2016, 3:03 p.m.
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@ti.com>
---
 drivers/gpu/drm/tilcdc/tilcdc_drv.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

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diff --git a/drivers/gpu/drm/tilcdc/tilcdc_drv.c b/drivers/gpu/drm/tilcdc/tilcdc_drv.c
index c5d9e3a..964e192 100644
--- a/drivers/gpu/drm/tilcdc/tilcdc_drv.c
+++ b/drivers/gpu/drm/tilcdc/tilcdc_drv.c
@@ -376,13 +376,14 @@  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;
 }
@@ -397,7 +398,7 @@  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);
@@ -442,7 +443,7 @@  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
 };