Tool/software: Linux
Dear folks
This all reflects in Poky and meta-ti at their krogoth branches.
I ve made a little patch ( attached) which fixes in the 4.4.y kernel the drm connector_type flag. This flag is set to "Unknown" when the device is used via DPI panels.
This will lead weston-1.9.0 to not detect the backlight contexts as the connector_type is 0.
weston-1.9.0/src/libbacklight.c :177
if (connector_type <= 0)
return NULL;
output is:
[14:22:08.950] Failed to initialize backlight
[14:22:08.951] Output Unknown-1, (connector 31, crtc 33)
So my patch maps a OMAP_DISPLAY_TYPE_DPI to DRM_MODE_CONNECTOR_LVDS
This is somehow correct for our platform as we add a lvds chip and connect our dpi display to it.
so this will fix for example this node
/sys/class/drm/card0/card0-Unknown-1/
into
/sys/class/drm/card0-LVDS-1/
I dont know if later kernels or weston src fixes this etc but it works for our scenrio and i just wanted to let you guys know.
Cheers rob
From 208d3724dff325bab91a998de829554fa48824f5 Mon Sep 17 00:00:00 2001
From: Robert Woerle <robert@linuxdevelopment.de>
Date: Wed, 26 Apr 2017 12:40:31 +0200
Subject: [PATCH] omap_drv.c: add connector_type detection for DPI panels set
to DRM_MODE_CONNECTOR_LVDS
Signed-off-by: Robert Woerle <robert@linuxdevelopment.de>
---
drivers/gpu/drm/omapdrm/omap_drv.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/gpu/drm/omapdrm/omap_drv.c b/drivers/gpu/drm/omapdrm/omap_drv.c
index 89e5cef..a788459 100644
--- a/drivers/gpu/drm/omapdrm/omap_drv.c
+++ b/drivers/gpu/drm/omapdrm/omap_drv.c
@@ -217,6 +217,8 @@ static int get_connector_type(struct omap_dss_device *dssdev)
return DRM_MODE_CONNECTOR_DVID;
case OMAP_DISPLAY_TYPE_DSI:
return DRM_MODE_CONNECTOR_DSI;
+ case OMAP_DISPLAY_TYPE_DPI:
+ return DRM_MODE_CONNECTOR_LVDS;
default:
return DRM_MODE_CONNECTOR_Unknown;
}
--
1.9.1
