diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.4/0470-drm-vc4-Replace-HDMI-force-connected-with-an-EDID-pr.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.4/0470-drm-vc4-Replace-HDMI-force-connected-with-an-EDID-pr.patch | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.4/0470-drm-vc4-Replace-HDMI-force-connected-with-an-EDID-pr.patch b/target/linux/brcm2708/patches-4.4/0470-drm-vc4-Replace-HDMI-force-connected-with-an-EDID-pr.patch new file mode 100644 index 0000000000..3c2379438d --- /dev/null +++ b/target/linux/brcm2708/patches-4.4/0470-drm-vc4-Replace-HDMI-force-connected-with-an-EDID-pr.patch @@ -0,0 +1,42 @@ +From 05352a2959d8924a6333726cd15144245d7c98fa Mon Sep 17 00:00:00 2001 +From: Eric Anholt <eric@anholt.net> +Date: Fri, 12 Aug 2016 10:57:41 -0700 +Subject: [PATCH] drm/vc4: Replace HDMI force-connected with an EDID probe. + +The force-connected started out because I didn't know how to read the +HPD pin successfully, which required the hpd_active_low check and +getting the correct active level into the DTs. It stayed because we +don't have the Pi3's HPD line exposed to Linux, so this was the only +way to bring up graphics on it. + +However, with the DSI panel support now present, users want to be able +to run DSI-only systems, and forcing HDMI on is interfering with +default screen configurations. Work around the Pi3's missing HPD by +probing the DDC on I2C and see if it's present at all. + +Signed-off-by: Eric Anholt <eric@anholt.net> +--- + drivers/gpu/drm/vc4/vc4_hdmi.c | 5 +++-- + 1 file changed, 3 insertions(+), 2 deletions(-) + +--- a/drivers/gpu/drm/vc4/vc4_hdmi.c ++++ b/drivers/gpu/drm/vc4/vc4_hdmi.c +@@ -166,8 +166,6 @@ vc4_hdmi_connector_detect(struct drm_con + struct drm_device *dev = connector->dev; + struct vc4_dev *vc4 = to_vc4_dev(dev); + +- return connector_status_connected; +- + if (vc4->hdmi->hpd_gpio) { + if (gpio_get_value_cansleep(vc4->hdmi->hpd_gpio) ^ + vc4->hdmi->hpd_active_low) +@@ -176,6 +174,9 @@ vc4_hdmi_connector_detect(struct drm_con + return connector_status_disconnected; + } + ++ if (drm_probe_ddc(vc4->hdmi->ddc)) ++ return connector_status_connected; ++ + if (HDMI_READ(VC4_HDMI_HOTPLUG) & VC4_HDMI_HOTPLUG_CONNECTED) + return connector_status_connected; + else |