media: atomisp: improve IRQ handling debug messages

When an IRQ is not handled, it is nice to know what's the
reason.
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/staging/media/atomisp/pci/atomisp_cmd.c

@@ -566,7 +566,7 @@ irqreturn_t atomisp_isr(int irq, void *dev)
 
 	if (irq_infos & IA_CSS_IRQ_INFO_CSS_RECEIVER_SOF) {
 		dev_dbg_ratelimited(isp->dev,
-				    "irq:0x%x (IA_CSS_IRQ_INFO_CSS_RECEIVER_SOF)\n",
+				    "irq:0x%x (SOF)\n",
 				    irq_infos);
 		irq_infos &= ~IA_CSS_IRQ_INFO_CSS_RECEIVER_SOF;
 	}
@@ -591,14 +591,14 @@ irqreturn_t atomisp_isr(int irq, void *dev)
 			/* EOF Event does not have the css_pipe returned */
 			asd = __get_asd_from_port(isp, eof_event.event.port);
 			if (!asd) {
-				dev_err(isp->dev, "%s:no subdev.event:%d",
+				dev_err(isp->dev, "%s: ISYS event, but no subdev.event:%d",
 					__func__, eof_event.event.type);
 				continue;
 			}
 
 			atomisp_eof_event(asd, eof_event.event.exp_id);
 			dev_dbg_ratelimited(isp->dev,
-					    "%s EOF exp_id %d, asd %d\n",
+					    "%s ISYS event: EOF exp_id %d, asd %d\n",
 					    __func__, eof_event.event.exp_id,
 					    asd->index);
 		}
@@ -610,7 +610,7 @@ irqreturn_t atomisp_isr(int irq, void *dev)
 
 	spin_unlock_irqrestore(&isp->lock, flags);
 
-	dev_dbg_ratelimited(isp->dev, "irq:0x%x\n", irq_infos);
+	dev_dbg_ratelimited(isp->dev, "irq:0x%x (unhandled)\n", irq_infos);
 
 	return IRQ_WAKE_THREAD;
 
@@ -618,7 +618,8 @@ irqreturn_t atomisp_isr(int irq, void *dev)
 	spin_unlock_irqrestore(&isp->lock, flags);
 
 	if (irq_infos)
-		dev_dbg_ratelimited(isp->dev, "irq:0x%x\n", irq_infos);
+		dev_dbg_ratelimited(isp->dev, "irq:0x%x (ignored, as not streaming anymore)\n",
+				    irq_infos);
 
 	return IRQ_HANDLED;
 }