From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from protonic.xs4all.nl ([83.163.252.89] helo=protonic.nl) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1hXjXh-0007qc-SX for barebox@lists.infradead.org; Mon, 03 Jun 2019 09:46:15 +0000 MIME-Version: 1.0 Date: Mon, 03 Jun 2019 11:46:05 +0200 From: Robin van der Gracht Message-ID: <749e45534db70a7fd805d69008113640@protonic.nl> 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: simplefb question To: Andre Heider , Sascha Hauer , barebox@lists.infradead.org Hello Andre, Sascha, I'm trying to setup simplefb on my imx6 solo board, and ran into some issues and I'm hoping you could clear things up. I'm running: - Barebox 2018.07.0 - Linux 4.19 I checked with latest versions but the relevant code seems unchanged. On Barebox console I ran: barebox@BOARD:/ of_dump /framebuffer framebuffer { display = <0x5a>; }; barebox@BOARD:/ fb0.enable=1 imx-ipuv3-crtc imx-ipuv3-crtc0: ipu_crtc_mode_set: mode->xres: 800 imx-ipuv3-crtc imx-ipuv3-crtc0: ipu_crtc_mode_set: mode->yres: 480 WARNING: imx-ipuv3-crtc imx-ipuv3-crtc0: videomode adapted for IPU restriction barebox@BOARD:/ fb0.register_simplefb=1 barebox@BOARD:/ oftree -s dump.dtb fb0: created r8g8b8 node (I added that mode) barebox@BOARD:/ of_dump -f dump.dtb /framebuffer framebuffer { display = <0x5a>; compatible = "simple-framebuffer"; reg = <0x19ca9000 0x177000>; width = <0x320>; height = <0x1e0>; stride = <0xc80>; format = "r8g8b8"; status = "okay"; }; # Side-note: Kernel doc says this device-tree node has to in the /chosen section..? The framebuffer is allocated in 'drivers/video/imx-ipu-v3/ipufb.c' ipufb_activate_var() with dma_alloc_writecombine(). This failed with my Barebox version, and found that Sascha fixed that upstream, so I applied these: - ARM: MMU: fix arch_remap_range() across section boundaries - ARM: mmu: fix cache flushing when replacing a section with a PTE - ARM: MMU: fix wrong dma_flush_range in arm_create_pte() # So far so good. When I boot Linux I get the following WARN() [ 0.071950] ------------[ cut here ]------------ [ 0.071974] WARNING: CPU: 0 PID: 1 at arch/arm/mm/ioremap.c:309 __arm_ioremap_pfn_caller+0x1ec/0x210 [ 0.071980] Modules linked in: [ 0.071998] CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.19.0-20190401-1-00290-gd141d156c111f-dirty #1023 [ 0.072007] Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree) [ 0.072036] [<8010ffec>] (unwind_backtrace) from [<8010b8dc>] (show_stack+0x10/0x14) [ 0.072053] [<8010b8dc>] (show_stack) from [<8091d5fc>] (dump_stack+0x88/0x9c) [ 0.072074] [<8091d5fc>] (dump_stack) from [<8011e5d8>] (__warn+0xd4/0xf0) [ 0.072092] [<8011e5d8>] (__warn) from [<8011e634>] (warn_slowpath_null+0x40/0x48) [ 0.072109] [<8011e634>] (warn_slowpath_null) from [<80115230>] (__arm_ioremap_pfn_caller+0x1ec/0x210) [ 0.072124] [<80115230>] (__arm_ioremap_pfn_caller) from [<80115298>] (__arm_ioremap_caller+0x44/0x54) [ 0.072141] [<80115298>] (__arm_ioremap_caller) from [<80407900>] (simplefb_probe+0x1fc/0x898) [ 0.072162] [<80407900>] (simplefb_probe) from [<804ade34>] (platform_drv_probe+0x48/0x98) [ 0.072179] [<804ade34>] (platform_drv_probe) from [<804ac23c>] (really_probe+0x1f4/0x2b8) [ 0.072193] [<804ac23c>] (really_probe) from [<804ac464>] (driver_probe_device+0x60/0x164) [ 0.072207] [<804ac464>] (driver_probe_device) from [<804ac644>] (__driver_attach+0xdc/0xe0) [ 0.072224] [<804ac644>] (__driver_attach) from [<804aa540>] (bus_for_each_dev+0x74/0xb4) [ 0.072242] [<804aa540>] (bus_for_each_dev) from [<804ab6cc>] (bus_add_driver+0x1bc/0x200) [ 0.072258] [<804ab6cc>] (bus_add_driver) from [<804acf50>] (driver_register+0x7c/0x114) [ 0.072276] [<804acf50>] (driver_register) from [<80e1b1f8>] (simplefb_init+0x14/0x8c) [ 0.072293] [<80e1b1f8>] (simplefb_init) from [<80102618>] (do_one_initcall+0x7c/0x1a8) [ 0.072313] [<80102618>] (do_one_initcall) from [<80e00e40>] (kernel_init_freeable+0x148/0x1dc) [ 0.072334] [<80e00e40>] (kernel_init_freeable) from [<80930c78>] (kernel_init+0x8/0x110) [ 0.072349] [<80930c78>] (kernel_init) from [<801010d8>] (ret_from_fork+0x14/0x3c) [ 0.072358] Exception stack(0x8b84bfb0 to 0x8b84bff8) [ 0.072369] bfa0: 00000000 00000000 00000000 00000000 [ 0.072381] bfc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 [ 0.072391] bfe0: 00000000 00000000 00000000 00000000 00000013 00000000 [ 0.072435] ---[ end trace d197b304a56deeb0 ]--- [ 0.072463] simple-framebuffer: probe of 19ca9000.framebuffer failed with error -12 If I understand correctly, this is due to the use of ioremap_wc on a RAM region. I was hoping you could tell me what I'm doing wrong here, or if I'm looking at a bug. My mtype = MT_DEVICE_WC. (Due to the in kernel use of ioremap_wc()) My pfn = 0x19ca9 In my kernel .config i have: CONFIG_HAVE_ARCH_PFN_VALID=y Kind regards, Robin van der Gracht _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox