From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from metis.ext.pengutronix.de ([2001:67c:670:201:290:27ff:fe1d:cc33]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1aY8Ow-0001Oh-VZ for barebox@lists.infradead.org; Tue, 23 Feb 2016 08:32:59 +0000 Date: Tue, 23 Feb 2016 09:32:36 +0100 From: Sascha Hauer Message-ID: <20160223083236.GA3939@pengutronix.de> References: MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "barebox" Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: Re: Help configuring i.MX6 IPUv3 with a parrallel display To: Philippe Leduc Cc: barebox@lists.infradead.org On Mon, Feb 22, 2016 at 05:41:01PM +0100, Philippe Leduc wrote: > Hello, > > I would like to use the barebox framebuffer on a iMX6S chip. My goal > is to display a splashscreen. However, I can't manage to use the > framebuffer for now... > > Here is the output of "devinfo fb0": > Resources: > num: 0 > start: 0x00000000 > size: 0x00000000 > Available modes: > Parameters: > enable: 0 > mode_name: invalid:0 > shadowfb: 1 > > Is this a correct behavior that there is NO availables modes? I do not > manage to add one through the DTS. > > If I try to enable the framebuffer (fb0.enable=1), barebox hangs: > fb0.enable=1 > unable to handle NULL pointer dereference at address 0x0000001d > pc : [<2ff1ab1c>] lr : [<2ff17f41>] > sp : 2ffffa3c ip : 2ff1a3fa fp : 2ffffa78 > r10: 20212d0c r9 : 00000000 r8 : 00000000 > r7 : 20024210 r6 : f57fffff r5 : 0c000000 r4 : 0000001d > r3 : 2ff1a1e5 r2 : 0c000000 r1 : 0000005c r0 : 00000022 > Flags: nzcv IRQs off FIQs off Mode SVC_32 > [<2ff1ab1c>] (clk_is_enabled+0x34/0x38) from [<7f8d1fc0>] (0x7f8d1fc0) > > [<2ff389d9>] (unwind_backtrace+0x1/0x58) from [<2ff00d19>] (panic+0x1d/0x34) > [<2ff00d19>] (panic+0x1d/0x34) from [<2ff38e7d>] (do_exception+0xd/0x10) > [<2ff38e7d>] (do_exception+0xd/0x10) from [<2ff38edd>] (do_data_abort+0x21/0x2c) > [<2ff38edd>] (do_data_abort+0x21/0x2c) from [<2ff38bd4>] (do_abort_6+0x48/0x54) > Switch to console [serial0] > > Here is what I put in the DTS to enable the display: > > display0: display@di0 { > compatible = "fsl,imx-parallel-display"; > // crtcs = <&ipu1 0>; > interface-pix-fmt = "rgb24"; > pinctrl-names = "default"; > pinctrl-0 = <&pinctrl_ipu_disp>; > status = "okay"; > > display-timings { > rk043fn07h { > native-mode; > clock-frequency = <9000000 15000000>; > hactive = <480>; > vactive = <272>; > hfront-porch = <2 2 82>; > hback-porch = <2 2 41>; > hsync-len = <2 41 41>; > vback-porch = <1 2 11>; > vfront-porch = <1 2 227>; > vsync-len = <1 10 11>; > pixelclk-active = <1>; > hsync-active = <0>; > vsync-active = <0>; > de-active = <1>; > }; > }; > > port { > display0_in: endpoint { > remote-endpoint = <&ipu1_di0_disp0>; > }; > }; > > > &ipu1_di0_disp0 { > remote-endpoint = <&display0_in>; > }; Parallel display support for IPUv3 is not yet implemented. What's missing is a driver that matches to "fsl,imx-parallel-display", calls vpl_register on its own node and returns the display timings parsed from device tree in the VPL_GET_VIDEOMODES callback. You could try the following binding instead. It doesn't use the "fsl,imx-parallel-display" compatible but the "simple-panel" binding instead. Since IPU parallel display support is a no-op anyway this should work. Note that this binding is not compatible with the kernel since the maintainer refuses to let display timings into the device tree for simple panels. panel { compatible = "simple-panel"; display-timings { /* your timings here */ }; port { display0_in: enpoint { remote-endpoint = <&ipu1_di0_disp0>; }; }; }; &ipu1_di0_disp0 { interface-pix-fmt = "rgb24"; remote-endpoint = <&display0_in>; }; Sascha -- Pengutronix e.K. | | Industrial Linux Solutions | http://www.pengutronix.de/ | Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox