drm/omap: DMM: Print information if we received an error interrupt

To help diagnose DMM errors, print out information if any of the error bits
are set in the interrupt status register.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/gpu/drm/omapdrm/omap_dmm_tiler.c b/drivers/gpu/drm/omapdrm/omap_dmm_tiler.c
index e3725dc60e2c..d7f2940cb596 100644
--- a/drivers/gpu/drm/omapdrm/omap_dmm_tiler.c
+++ b/drivers/gpu/drm/omapdrm/omap_dmm_tiler.c
@@ -166,6 +166,11 @@ static irqreturn_t omap_dmm_irq_handler(int irq, void *arg)
         dmm_write(dmm, status, DMM_PAT_IRQSTATUS);
 
         for (i = 0; i < dmm->num_engines; i++) {
+                if (status & DMM_IRQSTAT_ERR_MASK)
+                        dev_err(dmm->dev,
+                                "irq error(engine%d): IRQSTAT 0x%02x\n",
+                                i, status & 0xff);
+
                 if (status & DMM_IRQSTAT_LST) {
                         if (dmm->engines[i].async)
                                 release_engine(&dmm->engines[i]);