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drm/tilcdc: Add timeout wait for palette loading to complete 

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>
Tested-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
This commit is contained in:
Jyri Sarha 2016-11-17 18:46:16 +02:00
parent 55e165c4d9
commit e59f5af9fb
1 changed files with 5 additions and 1 deletions
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6
drivers/gpu/drm/tilcdc/tilcdc_crtc.c
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@ -125,6 +125,7 @@ static void tilcdc_crtc_load_palette(struct drm_crtc *crtc)
struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc); struct tilcdc_crtc *tilcdc_crtc = to_tilcdc_crtc(crtc);
struct drm_device *dev = crtc->dev; struct drm_device *dev = crtc->dev;
struct tilcdc_drm_private *priv = dev->dev_private; 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_base = tilcdc_read(dev, LCDC_DMA_FB_BASE_ADDR_0_REG);
dma_fb_ceiling = tilcdc_read(dev, LCDC_DMA_FB_CEILING_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_clear_irqstatus(dev, 0xffffffff);
tilcdc_set(dev, LCDC_RASTER_CTRL_REG, LCDC_RASTER_ENABLE); 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. */ /* Disable LCDC DMA and DMA Palette Loaded Interrupt. */
tilcdc_clear(dev, LCDC_RASTER_CTRL_REG, LCDC_RASTER_ENABLE); tilcdc_clear(dev, LCDC_RASTER_CTRL_REG, LCDC_RASTER_ENABLE);