i3c: mipi-i3c-hci: Fix handling status of i3c_hci_irq_handler()

Return IRQ_HANDLED from the i3c_hci_irq_handler() only if some
INTR_STATUS bit was set or if DMA/PIO handler handled it.

Currently it returns IRQ_HANDLED in case INTR_STATUS is zero and IO
handler returns false. Which could be the case if interrupt comes from
other device or is spurious.

Reviewed-by: Frank Li <Frank.Li@nxp.com>
Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Link: https://lore.kernel.org/r/20250409140401.299251-2-jarkko.nikula@linux.intel.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

Author: jhnikula

drivers/i3c/master/mipi-i3c-hci/core.c

@@ -594,6 +594,7 @@ static irqreturn_t i3c_hci_irq_handler(int irq, void *dev_id)
 
 	if (val) {
 		reg_write(INTR_STATUS, val);
+		result = IRQ_HANDLED;
 	}
 
 	if (val & INTR_HC_RESET_CANCEL) {
@@ -605,12 +606,11 @@ static irqreturn_t i3c_hci_irq_handler(int irq, void *dev_id)
 		val &= ~INTR_HC_INTERNAL_ERR;
 	}
 
-	hci->io->irq_handler(hci);
+	if (hci->io->irq_handler(hci))
+		result = IRQ_HANDLED;
 
 	if (val)
 		dev_err(&hci->master.dev, "unexpected INTR_STATUS %#x\n", val);
-	else
-		result = IRQ_HANDLED;
 
 	return result;
 }