bcm27xx: import latest patches from the RPi foundation

bcm2708: boot tested on RPi B+ v1.2
bcm2709: boot tested on RPi 3B v1.2 and RPi 4B v1.1 4G
bcm2710: boot tested on RPi 3B v1.2
bcm2711: boot tested on RPi 4B v1.1 4G

Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>

1 files changed, 56 insertions, 0 deletions

diff --git a/target/linux/bcm27xx/patches-5.4/950-0762-vc4-cec-Restore-cec-physical-address-on-reconnect.patch b/target/linux/bcm27xx/patches-5.4/950-0762-vc4-cec-Restore-cec-physical-address-on-reconnect.patch
new file mode 100644
index 0000000000..d42f61d2e4
--- /dev/null
+++ b/target/linux/bcm27xx/patches-5.4/950-0762-vc4-cec-Restore-cec-physical-address-on-reconnect.patch
@@ -0,0 +1,56 @@
+From 7776a876ce7a6eeda164aebacc965116821d3095 Mon Sep 17 00:00:00 2001
+From: Dom Cobley <popcornmix@gmail.com>
+Date: Wed, 3 Jun 2020 12:20:19 +0100
+Subject: [PATCH] vc4: cec: Restore cec physical address on reconnect
+
+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.
+
+Set it back up again on the hotplug assert.
+
+Signed-off-by: Dom Cobley <popcornmix@gmail.com>
+---
+ drivers/gpu/drm/vc4/vc4_hdmi.c | 25 +++++++++++++++++--------
+ 1 file changed, 17 insertions(+), 8 deletions(-)
+
+--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
++++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
+@@ -113,20 +113,29 @@ 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;
+ }