Hi Inki, 2015-04-07 Inki Dae <inki.dae@xxxxxxxxxxx>: > On 2015년 04월 07일 00:44, Inki Dae wrote: > > 2015-04-06 19:46 GMT+09:00 Inki Dae <inki.dae@xxxxxxxxxxx>: > >> On 2015년 04월 04일 03:09, Gustavo Padovan wrote: > >>> From: Gustavo Padovan <gustavo.padovan@xxxxxxxxxxxxxxx> > >>> > >>> Hi, > >>> > >>> Here goes the full support for atomic modesetting on exynos. I've > >>> split the patches in the various phases of atomic support. > >>> > >>> These patches sits on top of the clean up patches I've sent yesterday > >>> to this mailing list[1]. > >>> > >>> v2: fixes comments by Joonyoung > >>> - remove unused var in patch 09 > >>> - use ->disable instead of outdated ->dpms in hdmi code > >>> - remove WARN_ON from crtc enable/disable > >>> > >>> v3: fixes comment by Joonyoung > >>> - move the removal of drm_helper_disable_unused_functions() to > >>> separated patch > >> > >> With this patch series, Kernel booting is halted at end of kernel > >> booting. I tested this patch series on Trats2 board based on Exynos4412 SoC. > >> > >> Below is a part of full booting logs, which was halted, > >> [ 1.992015] exynos-drm-ipp exynos-drm-ipp: drm ipp registered > >> successfully. > >> [ 1.993009] exynos-drm exynos-drm: bound exynos-drm-vidi (ops > >> vidi_component_ops) > >> [ 1.993036] exynos-drm exynos-drm: bound 11c00000.fimd (ops > >> fimd_component_ops) > >> [ 1.993385] exynos-drm exynos-drm: bound 11c80000.dsi (ops > >> exynos_dsi_component_ops) > >> [ 1.993390] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013). > >> [ 1.993393] [drm] No driver support for vblank timestamp query. > >> [ 1.993442] [drm] Initialized exynos 1.0.0 20110530 on minor 0 > >> [ 2.043358] WARNING: CPU: 2 PID: 1209 at drivers/clk/clk.c:898 > >> clk_unprepare+0x24/0x2c() > >> [ 2.051412] Modules linked in: > >> [ 2.054422] CPU: 2 PID: 1209 Comm: kworker/2:1 Tainted: G W > >> 4.0.0-rc6-00526-gc49d7de-dirty #1278 > >> [ 2.064337] Hardware name: SAMSUNG EXYNOS (Flattened Device Tree) > >> [ 2.070428] Workqueue: pm pm_runtime_work> > >> > >> After that, I tested it again without FIMD and the booting is ok. So I > >> guess that this atomic feature has a bug to FIMD driver. > >> > > > > More information, > > > > The reason the booting is halted is that a deadlock occurs at fbcon > > module when register_framebuffer() is called. > > > > Below are our test results, > > - with only cleanup series, FIMD and HDMI work well. > > - with cleanup and atomic series, HDMI works well but FIMD doesn't > > work - a deadlock occurs. > > > > Could anyone test it with the atomic series on trats2 board? You can > > test it on top of exynos-drm-next-todo branch which contains all > > relevant patches, > > https://git.kernel.org/cgit/linux/kernel/git/daeinki/drm-exynos.git/log/?h=exynos-drm-next-todo > > > > Anyway, we will continue to take a look at the this issue why the > > deadlock occurs. > > In addition, > > I added some codes temporarily to fbmem module which mitigates the > deadlock issue. After that, I see below panic log, > > [ 3.254840] Unable to handle kernel NULL pointer dereference at > virtual address 000000a4 > [ 3.262870] pgd = c0004000 > [ 3.265539] [000000a4] *pgd=00000000 > [ 3.269102] Internal error: Oops: 5 [#1] PREEMPT SMP ARM > [ 3.274392] Modules linked in: > [ 3.277435] CPU: 2 PID: 1 Comm: swapper/0 Tainted: G W > 4.0.0-rc6-00526-gc49d7de-dirty #1308 > [ 3.286892] Hardware name: SAMSUNG EXYNOS (Flattened Device Tree) > [ 3.292970] task: ee878000 ti: ee880000 task.ti: ee880000 > [ 3.298356] PC is at exynos_plane_atomic_update+0x24/0x1d4 > [ 3.303824] LR is at drm_atomic_helper_commit_planes+0xa4/0x18c > [ 3.309723] pc : [<c028bff4>] lr : [<c0265308>] psr: 60000113 > [ 3.309723] sp : ee881b38 ip : 00000020 fp : 00000000 > [ 3.321179] r10: c04cfc00 r9 : 00000008 r8 : eebfb9c0 > [ 3.326387] r7 : 00000002 r6 : 00000000 r5 : 00000000 r4 : ee925308 > [ 3.332897] r3 : ee329fc0 r2 : 00000000 r1 : 00000000 r0 : ee925308 > [ 3.339409] Flags: nZCv IRQs on FIQs on Mode SVC_32 ISA ARM > Segment kernel > [ 3.346699] Control: 10c5387d Table: 4000404a DAC: 00000015 > [ 3.352427] Process swapper/0 (pid: 1, stack limit = 0xee880210) > [ 3.358416] Stack: (0xee881b38 to 0xee882000) > [ 3.362757] 1b20: > c0726794 00000008 > [ 3.370919] 1b40: 00000002 ee925308 00000000 ee329e00 00000002 > eebfb9c0 00000008 c04cfc00 > [ 3.379078] 1b60: 00000000 c0265308 00000008 00000000 ee329e00 > ee0a8000 00000008 00000000 > [ 3.387237] 1b80: 00000000 c0267304 ee329e00 ee8efe00 ee914c00 > 00000002 00000000 00000002 > [ 3.395396] 1ba0: 00000000 c026609c c0265ef0 00000000 ee914c00 > 00000028 ee8eff00 00000001 > [ 3.403555] 1bc0: 00000000 c06c8380 00000000 c02770d0 ee8efe00 > 00000000 00000028 ee8eff00 > [ 3.411714] 1be0: 00000001 c0267a2c ee0a8000 c0286214 ee8eff00 > ee8eff00 ee0a8000 00000000 > [ 3.419874] 1c00: 00000000 c0722ad4 ee35e000 c0269900 00000000 > ee915400 00000000 c0269958 > [ 3.428033] 1c20: ee808c00 c020cc8c c0248620 c05d5448 ee808c00 > ee808c00 ee808d34 00000000 > [ 3.436192] 1c40: 00000000 00000001 00000066 c0724acc c0724fd4 > 0000005b 00000066 0000005b > [ 3.444351] 1c60: c05b28cc ee808c00 ee808d74 00000000 00000000 > 00000001 ee808c00 00000000 > [ 3.452511] 1c80: 00000001 c0246564 c04b4950 00000000 c0724fdc > c07250f0 00000001 c0248568 > [ 3.460670] 1ca0: c049cc58 c06ce2e4 00000000 0000003e c070da2c > c05d09ec 00000000 c0724fcc > [ 3.468829] 1cc0: 00000000 c04b4950 c0724fe8 00000000 00000000 > 00000000 0000003e 00000000 > [ 3.476988] 1ce0: c0725604 c0248de0 c05d54ac 00000001 ee074780 > 00000001 c0724920 c06c8380 > [ 3.485148] 1d00: c0724acc 00008380 00000005 00000000 00000000 > 01d00000 00000000 c020cd5c > [ 3.493306] 1d20: c06c8754 ffffffff ee881d88 c0039890 c06c8754 > 00000005 ee881d88 ffffffff > [ 3.501466] 1d40: ee915644 ee91540c 01d00000 c0039bec 00000000 > 00000000 ee915644 c06badb8 > [ 3.509625] 1d60: ee915400 c06badb8 00000000 c0039c1c 00000000 > ee915400 c06badb8 c0215980 > [ 3.517784] 1d80: c05d101c 00000000 ee915400 00000000 00000000 > 00000000 000002d0 00000500 > [ 3.525943] 1da0: 00000000 00000000 00000000 00000000 00000000 > 00000000 00000000 00000000 > [ 3.534103] 1dc0: 00000000 00000020 ee8efe50 ee8eff00 ee915400 > 00000001 ee8efe50 c0726794 > [ 3.542262] 1de0: 00000002 c0269bc4 000002d0 00000500 000002d0 > 00000500 00000020 00000018 > [ 3.550421] 1e00: ee0a8000 00000000 eebfbdc0 ee8eff00 ee0a8190 > c028a374 ee0a8288 00000001 > [ 3.558580] 1e20: ee0a8294 ee0a8000 ee0a8190 c025ff20 00000000 > c0491308 c06933e0 c0492b3c > [ 3.566740] 1e40: ee08b374 ee914428 ee9000d4 ee08b200 ee08b208 > 00000000 00000098 c06933e0 > [ 3.574899] 1e60: 00000000 c028e764 ee08b200 c0288088 ee9000d0 > ee9000d4 ee08b200 c029c5bc > [ 3.583058] 1e80: c0726874 ee08b208 c06d42a4 00000000 00000000 > c02a2504 ee08b208 c06d42a4 > [ 3.591217] 1ea0: ee08b23c c06d2b7c eebf83c0 c02a2708 00000000 > c06d42a4 c02a267c c02a0ad8 > [ 3.599376] 1ec0: ee9bf674 ee06db40 c06d42a4 ee06df00 00000000 > c02a1d2c c05dee34 c06bcbe0 > [ 3.607535] 1ee0: c0681fc8 c06d42a4 c06bcbe0 c0681fc8 00000000 > c02a2d04 c06bcbe0 c06bcbe0 > [ 3.615695] 1f00: c0681fc8 c0008990 ee855980 c04971d0 00000025 > 00000000 60000100 c06c066c > [ 3.623854] 1f20: 00000000 c06c066c 60000113 00000003 ef7fc9ed > ef7fc9de c04a96e8 c00384d0 > [ 3.632013] 1f40: c05f26cc ef7fc9fc 00000006 00000006 c06c0648 > ef7fc940 c06b3f98 00000006 > [ 3.640172] 1f60: c06933d8 c06eabc0 c06eabc0 00000098 c06933e0 > c0668dac 00000006 00000006 > [ 3.648331] 1f80: c0668594 c003c944 0000abc0 c048bed0 00000000 > 00000000 00000000 00000000 > [ 3.656490] 1fa0: 00000000 c048bedc 00000000 c000e7c0 00000000 > 00000000 00000000 00000000 > [ 3.664649] 1fc0: 00000000 00000000 00000000 00000000 00000000 > 00000000 00000000 00000000 > [ 3.672809] 1fe0: 00000000 00000000 00000000 00000000 00000013 > 00000000 ffffffff ffffffff > [ 3.680977] [<c028bff4>] (exynos_plane_atomic_update) from > [<c0265308>] (drm_atomic_helper_commit_planes+0xa4/0x18c) > [ 3.691475] [<c0265308>] (drm_atomic_helper_commit_planes) from > [<c0267304>] (drm_atomic_helper_commit+0xec/0x144) > [ 3.701804] [<c0267304>] (drm_atomic_helper_commit) from [<c026609c>] > (drm_atomic_helper_set_config+0x1ac/0x3d0) > [ 3.711962] [<c026609c>] (drm_atomic_helper_set_config) from > [<c02770d0>] (drm_mode_set_config_internal+0x58/0xd4) > [ 3.722288] [<c02770d0>] (drm_mode_set_config_internal) from > [<c0267a2c>] (restore_fbdev_mode+0xd4/0xf4) > [ 3.731749] [<c0267a2c>] (restore_fbdev_mode) from [<c0269900>] > (drm_fb_helper_restore_fbdev_mode_unlocked+0x1c/0x5c) > [ 3.742338] [<c0269900>] (drm_fb_helper_restore_fbdev_mode_unlocked) > from [<c0269958>] (drm_fb_helper_set_par+0x18/0x34) > [ 3.753191] [<c0269958>] (drm_fb_helper_set_par) from [<c020cc8c>] > (fbcon_init+0x5c8/0x614) > [ 3.761525] [<c020cc8c>] (fbcon_init) from [<c0246564>] > (visual_init+0xa4/0xec) > > exynos_plane_atomic_update function calls internally > exynos_plane_mode_set function, and this call incurs a panic because > exynos_plane_mode_set function is called with null argument - > state->crtc is null. I just checked the value of state->crtc for me at this point of the flow and it is not NULL. I wonder why this works differently for your board. Could you check if state is null or if state->crtc is null? Gustavo -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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