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drm/tilcdc: Enable sync lost error and recovery handling for rev 1 LCDC

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Revision 1 LCDC support also sync lost errors and can benefit from
sync lost recovery routine.

Signed-off-by: Jyri Sarha <jsarha@ti.com>
Tested-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
This commit is contained in:
Jyri Sarha 2016-11-16 00:12:27 +02:00
parent ec9eab097a
commit cba8844a68
2 changed files with 21 additions and 15 deletions
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35
drivers/gpu/drm/tilcdc/tilcdc_crtc.c
View File

@ -113,6 +113,7 @@ 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_UNDERFLOW_INT_ENA);
tilcdc_set(dev, LCDC_DMA_CTRL_REG,
LCDC_V1_END_OF_FRAME_INT_ENA);
@ -131,6 +132,7 @@ 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_UNDERFLOW_INT_ENA | LCDC_V1_PL_INT_ENA);
tilcdc_clear(dev, LCDC_DMA_CTRL_REG,
LCDC_V1_END_OF_FRAME_INT_ENA);
@ -845,6 +847,24 @@ irqreturn_t tilcdc_crtc_irq(struct drm_crtc *crtc)
dev_err_ratelimited(dev->dev, "%s(0x%08x): FIFO underflow",
__func__, stat);
if (stat & LCDC_SYNC_LOST) {
dev_err_ratelimited(dev->dev, "%s(0x%08x): Sync lost",
__func__, stat);
tilcdc_crtc->frame_intact = false;
if (tilcdc_crtc->sync_lost_count++ >
SYNC_LOST_COUNT_LIMIT) {
dev_err(dev->dev, "%s(0x%08x): Sync lost flood detected, recovering", __func__, stat);
queue_work(system_wq, &tilcdc_crtc->recover_work);
if (priv->rev == 1)
tilcdc_clear(dev, LCDC_RASTER_CTRL_REG,
LCDC_V1_SYNC_LOST_INT_ENA);
else
tilcdc_write(dev, LCDC_INT_ENABLE_CLR_REG,
LCDC_SYNC_LOST);
tilcdc_crtc->sync_lost_count = 0;
}
}
/* For revision 2 only */
if (priv->rev == 2) {
if (stat & LCDC_FRAME_DONE) {
@ -852,21 +872,6 @@ irqreturn_t tilcdc_crtc_irq(struct drm_crtc *crtc)
wake_up(&tilcdc_crtc->frame_done_wq);
}
if (stat & LCDC_SYNC_LOST) {
dev_err_ratelimited(dev->dev, "%s(0x%08x): Sync lost",
__func__, stat);
tilcdc_crtc->frame_intact = false;
if (tilcdc_crtc->sync_lost_count++ >
SYNC_LOST_COUNT_LIMIT) {
dev_err(dev->dev, "%s(0x%08x): Sync lost flood detected, recovering", __func__, stat);
queue_work(system_wq,
&tilcdc_crtc->recover_work);
tilcdc_write(dev, LCDC_INT_ENABLE_CLR_REG,
LCDC_SYNC_LOST);
tilcdc_crtc->sync_lost_count = 0;
}
}
/* Indicate to LCDC that the interrupt service routine has
* completed, see 13.3.6.1.6 in AM335x TRM.
*/

1
drivers/gpu/drm/tilcdc/tilcdc_regs.h
View File

@ -61,6 +61,7 @@
#define LCDC_V2_UNDERFLOW_INT_ENA BIT(5)
#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_MONOCHROME_MODE BIT(1)
#define LCDC_RASTER_ENABLE BIT(0)
#define LCDC_TFT_ALT_ENABLE BIT(23)