[PATCH] drm/bridge: dw-hdmi: move cec PA invalidation to dw_hdmi_setup_rx_sense()

[Hans Verkuil]

When testing CEC on the AML-S905X-CC board I noticed that the CEC physical
address was not invalidated when the HDMI cable was unplugged. Some more
digging showed that meson uses meson_dw_hdmi.c to handle the HPD.

Both dw_hdmi_irq() and dw_hdmi_top_thread_irq() (in meson_dw_hdmi.c) call
the dw_hdmi_setup_rx_sense() function. So move the code to invalidate the
CEC physical address to that function, so that it is independent of where
the HPD interrupt happens.

Tested with both a AML-S905X-CC and a Khadas VIM2 board.

Signed-off-by: Hans Verkuil <hverkuil-cisco at xs4all.nl>
---
Note: an alternative would be to make a new dw-hdmi function such as
dw_hdmi_cec_phys_addr_invalidate() that is called from meson_dw_hdmi.c.
I decided not to do that since this patch is minimally invasive, but
that can obviously be changed if that approach is preferred.
---
diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
index c5a854af54f8..e899b31e1432 100644
--- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
+++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
@@ -2329,6 +2329,13 @@ void dw_hdmi_setup_rx_sense(struct dw_hdmi *hdmi, bool hpd, bool rx_sense)
 		dw_hdmi_update_power(hdmi);
 		dw_hdmi_update_phy_mask(hdmi);
 	}
+	if (!hpd && !rx_sense) {
+		struct cec_notifier *notifier = READ_ONCE(hdmi->cec_notifier);
+
+		if (notifier)
+			cec_notifier_phys_addr_invalidate(notifier);
+	}
+
 	mutex_unlock(&hdmi->mutex);
 }
 EXPORT_SYMBOL_GPL(dw_hdmi_setup_rx_sense);
@@ -2369,14 +2376,6 @@ static irqreturn_t dw_hdmi_irq(int irq, void *dev_id)
 		dw_hdmi_setup_rx_sense(hdmi,
 				       phy_stat & HDMI_PHY_HPD,
 				       phy_stat & HDMI_PHY_RX_SENSE);
-
-		if ((phy_stat & (HDMI_PHY_RX_SENSE | HDMI_PHY_HPD)) == 0) {
-			struct cec_notifier *notifier;
-
-			notifier = READ_ONCE(hdmi->cec_notifier);
-			if (notifier)
-				cec_notifier_phys_addr_invalidate(notifier);
-		}
 	}

 	if (intr_stat & HDMI_IH_PHY_STAT0_HPD) {