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 | 24 +++++++++++++++---------
1 file changed, 15 insertions(+), 9 deletions(-)
diff --git a/drivers/gpu/drm/tilcdc/tilcdc_crtc.c b/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
index 4d8f9a5..7c42475 100644
--- a/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
+++ b/drivers/gpu/drm/tilcdc/tilcdc_crtc.c
@@ -725,12 +725,17 @@ irqreturn_t tilcdc_crtc_irq(struct drm_crtc *crtc)
tilcdc_crtc->frame_intact = true;
}
- 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_FIFO_UNDERFLOW)
+ dev_err_ratelimited(dev->dev, "%s(0x%08x): FIFO underfow",
+ __func__, stat);
+
+ if (priv->rev == 1)
+ return IRQ_HANDLED;
+ /* The rest is for revision 2 only */
+
+ if (stat & LCDC_FRAME_DONE) {
+ tilcdc_crtc->frame_done = true;
+ wake_up(&tilcdc_crtc->frame_done_wq);
}
if (stat & LCDC_SYNC_LOST) {
@@ -746,9 +751,10 @@ irqreturn_t tilcdc_crtc_irq(struct drm_crtc *crtc)
}
}
- 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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