Reorder the IRQ function so that the write to LCDC_END_OF_INT_IND_REG
is done last. The write to LCDC_END_OF_INT_IND_REG indicates to LCDC
that the interrupt service routine has completed (see section
13.3.6.1.6 in AM335x TRM). This is needed if LCDC's ipgvmodirq module
is configured for pulse interrupts.
Signed-off-by: Jyri Sarha <jsarha@xxxxxx>
---
drivers/gpu/drm/tilcdc/tilcdc_crtc.c | 15 ++++++++++-----
1 file changed, 10 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/tilcdc/tilcdc_crtc.c b/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
index 6309d3c..65284e9 100644
--- a/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
+++ b/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
@@ -725,12 +725,16 @@ irqreturn_t tilcdc_crtc_irq(struct drm_crtc *crtc)
tilcdc_crtc->frame_intact = true;
}
+ if (stat & LCDC_FIFO_UNDERFLOW)
+ dev_err_ratelimited(dev->dev, "%s(0x%08x): FIFO underfow",
+ __func__, stat);
+
+ /* For revision 2 only */
if (priv->rev == 2) {
if (stat & LCDC_FRAME_DONE) {
tilcdc_crtc->frame_done = true;
wake_up(&tilcdc_crtc->frame_done_wq);
}
- tilcdc_write(dev, LCDC_END_OF_INT_IND_REG, 0);
if (stat & LCDC_SYNC_LOST) {
dev_err_ratelimited(dev->dev, "%s(0x%08x): Sync lost",
@@ -743,11 +747,12 @@ irqreturn_t tilcdc_crtc_irq(struct drm_crtc *crtc)
LCDC_SYNC_LOST);
}
}
- }
- if (stat & LCDC_FIFO_UNDERFLOW)
- dev_err_ratelimited(dev->dev, "%s(0x%08x): FIFO underfow",
- __func__, stat);
+ /* Indicate to LCDC that the interrupt service routine has
+ * completed, see 13.3.6.1.6 in AM335x TRM.
+ */
+ tilcdc_write(dev, LCDC_END_OF_INT_IND_REG, 0);
+ }
return IRQ_HANDLED;
}
--
1.9.1
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