drm/bridge: dw-hdmi-cec: Add arbitration lost event

Add handling of arbitration lost event.
Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Reviewed-by: Robert Foss <rfoss@kernel.org>
Signed-off-by: Robert Foss <rfoss@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230909144432.34972-1-jernej.skrabec@gmail.com

drivers/gpu/drm/bridge/synopsys/dw-hdmi-cec.c

@@ -145,6 +145,10 @@ static irqreturn_t dw_hdmi_cec_hardirq(int irq, void *data)
 		cec->tx_status = CEC_TX_STATUS_NACK;
 		cec->tx_done = true;
 		ret = IRQ_WAKE_THREAD;
+	} else if (stat & CEC_STAT_ARBLOST) {
+		cec->tx_status = CEC_TX_STATUS_ARB_LOST;
+		cec->tx_done = true;
+		ret = IRQ_WAKE_THREAD;
 	}
 
 	if (stat & CEC_STAT_EOM) {
@@ -209,7 +213,7 @@ static int dw_hdmi_cec_enable(struct cec_adapter *adap, bool enable)
 		cec->ops->enable(cec->hdmi);
 
 		irqs = CEC_STAT_ERROR_INIT | CEC_STAT_NACK | CEC_STAT_EOM |
-		       CEC_STAT_DONE;
+		       CEC_STAT_ARBLOST | CEC_STAT_DONE;
 		dw_hdmi_write(cec, irqs, HDMI_CEC_POLARITY);
 		dw_hdmi_write(cec, ~irqs, HDMI_CEC_MASK);
 		dw_hdmi_write(cec, ~irqs, HDMI_IH_MUTE_CEC_STAT0);