drm/omap: DMM: In case of error/timeout in wait_status() print the reason
If the wait_status() fails either because of an error reported in the
STATUS register or because of a timeout waiting for the wait_mask, print
information which might help diagnose the reason.
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
diff --git a/drivers/gpu/drm/omapdrm/omap_dmm_tiler.c b/drivers/gpu/drm/omapdrm/omap_dmm_tiler.c
index c60a85e..e3725dc 100644
--- a/drivers/gpu/drm/omapdrm/omap_dmm_tiler.c
+++ b/drivers/gpu/drm/omapdrm/omap_dmm_tiler.c
@@ -121,14 +121,22 @@ static int wait_status(struct refill_engine *engine, uint32_t wait_mask)
while (true) {
r = dmm_read(dmm, reg[PAT_STATUS][engine->id]);
err = r & DMM_PATSTATUS_ERR;
- if (err)
+ if (err) {
+ dev_err(dmm->dev,
+ "%s: error (engine%d). PAT_STATUS: 0x%08x\n",
+ __func__, engine->id, r);
return -EFAULT;
+ }
if ((r & wait_mask) == wait_mask)
break;
- if (--i == 0)
+ if (--i == 0) {
+ dev_err(dmm->dev,
+ "%s: timeout (engine%d). PAT_STATUS: 0x%08x\n",
+ __func__, engine->id, r);
return -ETIMEDOUT;
+ }
udelay(1);
}