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From:   Maxime Ripard <maxime@cerno.tech>
To:     Eric Anholt <eric@anholt.net>,
        Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
        Thomas Zimmermann <tzimmermann@suse.de>,
        Maxime Ripard <maxime@cerno.tech>,
        Daniel Vetter <daniel.vetter@intel.com>,
        David Airlie <airlied@linux.ie>
Cc:     Jason Cooper <jason@lakedaemon.net>,
        bcm-kernel-feedback-list@broadcom.com,
        linux-arm-kernel@lists.infradead.org,
        Marc Zyngier <maz@kernel.org>, linux-media@vger.kernel.org,
        Hans Verkuil <hverkuil-cisco@xs4all.nl>,
        linux-kernel@vger.kernel.org,
        Mauro Carvalho Chehab <mchehab@kernel.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Dave Stevenson <dave.stevenson@raspberrypi.com>,
        linux-rpi-kernel@lists.infradead.org,
        dri-devel@lists.freedesktop.org, Dom Cobley <popcornmix@gmail.com>
Subject: [PATCH 05/15] drm/vc4: hdmi: Restore cec physical address on reconnect
Date:   Thu, 10 Dec 2020 14:46:38 +0100
Message-Id: <20201210134648.272857-6-maxime@cerno.tech>
In-Reply-To: <20201210134648.272857-1-maxime@cerno.tech>
References: <20201210134648.272857-1-maxime@cerno.tech>
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From: Dom Cobley <popcornmix@gmail.com>

Currently we call cec_phys_addr_invalidate on a hotplug deassert.
That may be due to a TV power cycling, or an AVR being switched
on (and switching edid).

This makes CEC unusable since our controller wouldn't have a physical
address anymore.

Set it back up again on the hotplug assert.

Fixes: 15b4511a4af6 ("drm/vc4: add HDMI CEC support")
Signed-off-by: Dom Cobley <popcornmix@gmail.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
---
 drivers/gpu/drm/vc4/vc4_hdmi.c | 25 +++++++++++++++++--------
 1 file changed, 17 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
index 28b78ea885ea..eff3bac562c6 100644
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -136,20 +136,29 @@ static enum drm_connector_status
 vc4_hdmi_connector_detect(struct drm_connector *connector, bool force)
 {
 	struct vc4_hdmi *vc4_hdmi = connector_to_vc4_hdmi(connector);
+	bool connected = false;
 
 	if (vc4_hdmi->hpd_gpio) {
 		if (gpio_get_value_cansleep(vc4_hdmi->hpd_gpio) ^
 		    vc4_hdmi->hpd_active_low)
-			return connector_status_connected;
-		cec_phys_addr_invalidate(vc4_hdmi->cec_adap);
-		return connector_status_disconnected;
-	}
-
-	if (drm_probe_ddc(vc4_hdmi->ddc))
-		return connector_status_connected;
-
+			connected = true;
+	} else if (drm_probe_ddc(vc4_hdmi->ddc))
+		connected = true;
 	if (HDMI_READ(HDMI_HOTPLUG) & VC4_HDMI_HOTPLUG_CONNECTED)
+		connected = true;
+	if (connected) {
+		if (connector->status != connector_status_connected) {
+			struct edid *edid = drm_get_edid(connector, vc4_hdmi->ddc);
+
+			if (edid) {
+				cec_s_phys_addr_from_edid(vc4_hdmi->cec_adap, edid);
+				vc4_hdmi->encoder.hdmi_monitor = drm_detect_hdmi_monitor(edid);
+				drm_connector_update_edid_property(connector, edid);
+				kfree(edid);
+			}
+		}
 		return connector_status_connected;
+	}
 	cec_phys_addr_invalidate(vc4_hdmi->cec_adap);
 	return connector_status_disconnected;
 }
-- 
2.28.0