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drm/tilcdc: Write to LCDC_END_OF_INT_IND_REG at the end of IRQ function 

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@ti.com>
This commit is contained in:
Jyri Sarha 2016-04-07 20:36:48 +03:00
parent 1abcdac8ed
commit 149441134c
1 changed files with 10 additions and 5 deletions
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15
drivers/gpu/drm/tilcdc/tilcdc_crtc.c
View File

@ -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;
}