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drm/omap: DMM: In case of error/timeout in wait_status() print the reason

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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>
This commit is contained in:
Peter Ujfalusi 2017-09-29 14:49:47 +03:00 committed by Tomi Valkeinen
parent b3d5a8d77e
commit d312fe2ef5
1 changed files with 10 additions and 2 deletions
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12
drivers/gpu/drm/omapdrm/omap_dmm_tiler.c
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@ -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);
}