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[v4,07/10] drm/tilcdc: Add timeout wait for palette loading to complete

Message ID 8f10df31ee0a32687803c2c665822bb8f0d9fc4d.1480064884.git.jsarha@ti.com (mailing list archive)
State New, archived
Headers show

Commit Message

Jyri Sarha Nov. 25, 2016, 9:09 a.m. UTC 
Add timeout wait for palette loadind to complete. We do not want to
hang forever if palette loaded interrupt does not arrive for some
reason.

Signed-off-by: Jyri Sarha <jsarha@ti.com>
---
 drivers/gpu/drm/tilcdc/tilcdc_crtc.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)
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Patch

diff --git a/drivers/gpu/drm/tilcdc/tilcdc_crtc.c b/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
index b3edc6d..f736a89 100644
--- a/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
+++ b/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
@@ -125,6 +125,7 @@  static void tilcdc_crtc_load_palette(struct drm_crtc *crtc)
 	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;
 
 	dma_fb_base = tilcdc_read(dev, LCDC_DMA_FB_BASE_ADDR_0_REG);
 	dma_fb_ceiling = tilcdc_read(dev, LCDC_DMA_FB_CEILING_ADDR_0_REG);
@@ -152,7 +153,10 @@  static void tilcdc_crtc_load_palette(struct drm_crtc *crtc)
 	tilcdc_clear_irqstatus(dev, 0xffffffff);
 	tilcdc_set(dev, LCDC_RASTER_CTRL_REG, LCDC_RASTER_ENABLE);
 
-	wait_for_completion(&tilcdc_crtc->palette_loaded);
+	ret = wait_for_completion_timeout(&tilcdc_crtc->palette_loaded,
+					  msecs_to_jiffies(50));
+	if (ret == 0)
+		dev_err(dev->dev, "%s: Palette loading timeout", __func__);
 
 	/* Disable LCDC DMA and DMA Palette Loaded Interrupt. */
 	tilcdc_clear(dev, LCDC_RASTER_CTRL_REG, LCDC_RASTER_ENABLE);