From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from qmail.e-mind.com ([188.94.192.42]) by bombadil.infradead.org with smtp (Exim 4.87 #1 (Red Hat Linux)) id 1cgBs5-0007Wu-OJ for barebox@lists.infradead.org; Tue, 21 Feb 2017 14:56:56 +0000 References: <63687e34-f354-81d3-aed7-1a59866925c5@eurekelettronica.it> <2f43179e-2aa0-1dba-eafa-a9c0025afd24@eurekelettronica.it> From: gianluca Message-ID: <07c421c6-d583-9b6f-4ff5-f62c368df986@eurekelettronica.it> Date: Tue, 21 Feb 2017 15:56:29 +0100 MIME-Version: 1.0 In-Reply-To: <2f43179e-2aa0-1dba-eafa-a9c0025afd24@eurekelettronica.it> List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "barebox" Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: Re: Fwd: Barebox 2017.02 works great but no Linux Framebuffer... :-/ To: barebox@lists.infradead.org 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 > To: Sascha Hauer > > 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, > > > _______________________________________________ > barebox mailing list > barebox@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/barebox > -- Eurek s.r.l. | Electronic Engineering | http://www.eurek.it via Celletta 8/B, 40026 Imola, Italy | Phone: +39-(0)542-609120 p.iva 00690621206 - c.f. 04020030377 | Fax: +39-(0)542-609212 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox