Hi Inki,
2015-04-07 Inki Dae inki.dae@samsung.com:
On 2015년 04월 07일 16:06, Inki Dae wrote:
On 2015년 04월 07일 00:44, Inki Dae wrote:
2015-04-06 19:46 GMT+09:00 Inki Dae inki.dae@samsung.com:
On 2015년 04월 04일 03:09, Gustavo Padovan wrote:
From: Gustavo Padovan gustavo.padovan@collabora.co.uk
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disable instead of outdated -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=e...
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.
And below is the place where the deadlock occurs,
actual_w =exynos_plane_get_size(crtc_x, crtc_w, crtc->mode.hdisplay); NSR:C028BFF4 E595E0A4 ldr r14,[r5,%0xA4]
Ok,
I have tested several times since that. However, I'm not sure that your atomic series are tested and safe enough.
Only in case of one among several tests, FIMD worked well. That was a case that it enabled only FIMD driver except for other crtc drivers. However even this it's not stable because I faced with kernel panic. Below are the test cases I did,
#modetest -v -s 25@23:720x1280 -> it works well.
#modetest -s 25@23:720x1280 -P 23:100x100+0+0 -> it works well.
#modetest -s 25@23:720x1280 -P 23:100x100+0+0 -P 23:100x100+0+100 -> it works well.
#modetest -v -s 25@23:720x1280 -P 23:100x100+0+0 -> it doesn't work. See the below error logs,
If I got this right you are testing only with FIMD enabled and for me my patches are fully working on my snow hardware. I'll check what might be causing this for yours.
Gustavo