On 02/21/2017 02:04 PM, gianluca wrote:
Hello everybody!
I am fighting to enable ldb in Linux 4.9.7. In barebox the SAME
device-tree is modified by barebox to enable/disable the ldb or hdmi
depending on what is found.
During Linux bootup with HDMI only, it works with no hassle.
If booting with ldb it does not start the ldb driver registration due to
a panel/bridge missing.
In the config of linux kernel I have (as imx_v6_v7_defconfig) all drm
and simple panel enabled.
What is missing???
At the moment I can clearly state that (as kernel 4.9.7):
in the imx-ldb.c (line 711) in the function imx_ldb_bind() the error is
the channel->panel AND channel->bridge ARE both NULL.
The struct device_node *ep = of_graph_get_endpoint_by_regs(child,
imx_ldb->lvds_mux ? 4 : 2, -1) is not null and the remote struct
device_node as full name has: /panel.
This look suspicious to me as I am expecting a full_name as:
/soc/node/this/is/a/complete/name/panel stuff.
Anyway this issue is preventing to continue and registering a frame
buffer on the lvds channel.
Can anybody point me in the right direction? In the next few moments I
will try to diff the device-tree passed from barebox to linux kernel and
the device-tree expected.
Hold on... ;-)
Regards,
Gianluca
-------- Forwarded Message --------
Subject: Barebox 2017.02 works great but no Linux Framebuffer... :-/
Date: Mon, 20 Feb 2017 16:36:06 +0100
From: gianluca <gianlucarenzi@xxxxxxxxxxxxxxxxxxx>
To: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
Hello Sascha,
During last week I was able to activate/deactivate the hdmi and ldb
nodes from internal device-tree of Barebox and everything is working great.
Now I would like to boot up with the kernel 4.9.7 with the following
commandline but it fails.
The kernelcmd line is:
console=ttymxc2,115200 rootwait noswap ip=none noinitrd
rootfstype=nilfs2 root=/dev/mmcblk1p3
fec.macaddr=0x7a,0x3f,0x03,0xe3,0xa2,0xff system_rev=0xe3600000
system_serialnr=0x00000000 lcd_type=am1280800n3tz fastboot quiet
loglevel=3 console=tty0 video=mxcfb0:dev=ldb,if=RGB24,bpp=32
fbmem=32M vmalloc=400M
The problem is the ldb (imx-ldb.c you wrote in kernel
drivers/gpu/drm/imx...). It fails with the following error:
[ 7.526349] imx-ldb 2000000.aips-bus:ldb@020e0008: panel/bridge not
found: /panel --
[ 7.526369] imx-drm display-subsystem: failed to bind
2000000.aips-bus:ldb@020e0008 (ops 0xc097aaa0): -517
[ 7.526785] imx-drm display-subsystem: master bind failed: -517
The device-tree is attached.
The device tree is the same as Barebox (it has only an #included
commented out).
Both hdmi and ldb nodes are initially left "disabled" then barebox
enable the node corresponding to the hardware found (i.e. it changes the
status to "okay")
In barebox everything is working.
In linux NOT. What is exactly a 'channel->bridge' and 'channel->panel'
in device-tree therminology?
Barebox is working without it, so I suppose it was working in Linux
kernel too...
Regards,
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