So, I've smoke tested it. Though it is working, it's really unstable and causes kernel crash in many cases. I.e: This kernel crash (due to invalid read in kernel mode by 0x0000007c address) happens on HDMI cable disconnection: ----------------------------------->8------------------------------------------- Oops Path: (null) CPU: 0 PID: 12 Comm: kworker/0:1 Not tainted 5.7.0-rc6-03007-g4ceda91a4176 #5 Workqueue: events adv7511_hpd_work Invalid Read @ 0x0000007c by insn @ drm_gem_fb_get_obj+0xa/0x10 ECR: 0x00050100 EFA: 0x0000007c ERET: 0x813b954a STAT32: 0x80080442 [IE K DE ] BTA: 0x813eef62 BLK: arc_pgu_update+0x1a/0x30 SP: 0x9f055dd0 FP: 0x00000000 LPS: 0x8135603c LPE: 0x81356044 LPC: 0x00000000 r00: 0x00000000 r01: 0x00000000 r02: 0x9f6bc000 r03: 0x9f0d8000 r04: 0x9f0d8388 r05: 0x00000000 r06: 0x00000000 r07: 0x00000000 r08: 0x00000000 r09: 0x00000000 r10: 0x00000000 r11: 0x00000000 r12: 0x813eef62 Stack Trace: drm_gem_fb_get_obj+0xa/0x10 arc_pgu_update+0x1a/0x30 drm_atomic_helper_commit_planes.constprop.35+0xc8/0x23c commit_tail+0x164/0x274 drm_atomic_helper_commit+0x36a/0x398 drm_client_modeset_commit_atomic+0x136/0x1a4 drm_client_modeset_commit_locked+0x3a/0x118 drm_client_modeset_commit+0x18/0x34 drm_fb_helper_set_par+0x54/0xb0 drm_fb_helper_hotplug_event.part.16+0x70/0x8c drm_client_dev_hotplug+0x4a/0x74 adv7511_hpd_work+0x6c/0x124 process_one_work+0x19a/0x358 worker_thread+0x108/0x494 kthread+0xec/0x100 ret_from_fork+0x18/0x1c ----------------------------------->8------------------------------------------- This kernel crash (due to invalid read in kernel mode by 0x0 address) happens on weston stop: ----------------------------------->8------------------------------------------- Oops Path: (null) CPU: 0 PID: 158 Comm: weston Not tainted 5.7.0-rc6-03007-g4ceda91a4176 #5 Invalid Read @ 0x00000000 by insn @ drm_gem_fb_destroy+0x32/0x130 ECR: 0x00050100 EFA: 0x00000000 ERET: 0x813b9a76 STAT32: 0x80080002 [IE K ] BTA: 0x81345c66 BLK: drm_fb_release+0x66/0xb0 SP: 0x9f5c7db8 FP: 0x5fa4fa7c LPS: 0x813560ec LPE: 0x813560f0 LPC: 0x00000000 r00: 0x00000000 r01: 0x9e864392 r02: 0x00000002 r03: 0x00000001 r04: 0x00000026 r05: 0x00000000 r06: 0x00000114 r07: 0x00000001 r08: 0x9f0d8140 r09: 0xfffffe20 r10: 0x30405c00 r11: 0x00000039 r12: 0x813d6c16 r13: 0x00022cc8 r14: 0xffffffff r15: 0x00023ef0 r16: 0x5fa4f874 r17: 0x00022c58 r18: 0x5fa4fde4 r19: 0x00000000 r20: 0x000203c0 r21: 0x00000000 r22: 0x00022d40 r23: 0xffffffff r24: 0x5fa4fa80 r25: 0x2000b808 Stack Trace: drm_gem_fb_destroy+0x32/0x130 drm_fb_release+0x66/0xb0 drm_file_free.part.11+0x112/0x1bc drm_release+0x80/0x120 __fput+0x98/0x1bc task_work_run+0x6e/0xa8 do_exit+0x2b4/0x7fc do_group_exit+0x2a/0x8c get_signal+0x9a/0x5f0 do_signal+0x86/0x23c resume_user_mode_begin+0x88/0xd0 ----------------------------------->8------------------------------------------- It was tested on AXS103 board with ARC PGU + adv7511 HDMI bridge. Probably you have some ideas about how to fix it? Thanks. > From: Daniel Vetter <daniel@xxxxxxxx> > Sent: Monday, May 25, 2020 20:26 > To: Eugeniy Paltsev > Cc: dri-devel > Subject: Re: [PATCH 53/59] drm/arc: Move to drm/tiny > > On Mon, May 25, 2020 at 6:36 PM Eugeniy Paltsev > <Eugeniy.Paltsev@xxxxxxxxxxxx> wrote: > > > > Hi Daniel, > > > > looks like I'll finally have some time for review of "drm/arc: Move to drm/tiny". > > So, is it possible to find all these changes in any public git repo? > > I have a horrible pile with everything here: > > https://urldefense.com/v3/__https://cgit.freedesktop.org/*danvet/drm/log/__;fg!!A4F2R9G_pg!KUgdCRZoVj_85WhtTr0NUhsLhDgVTN_7s2aNdS4mMmRDfstvp4JbIYdip4J0P3Hg1NQLG2E$ > > I can also give you a cherry-picked branch with just the arc patches, > on drm-tip (maybe also linux-next, not sure everything is there > because of the merge window freeze we're in already). > -Daniel > -- > Daniel Vetter > Software Engineer, Intel Corporation > +41 (0) 79 365 57 48 - https://urldefense.com/v3/__http://blog.ffwll.ch__;!!A4F2R9G_pg!KUgdCRZoVj_85WhtTr0NUhsLhDgVTN_7s2aNdS4mMmRDfstvp4JbIYdip4J0P3HgteJOwjA$ _______________________________________________ linux-snps-arc mailing list linux-snps-arc@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/linux-snps-arc
