On 6 July 2016 at 20:05, Mario Kleiner <mario.kleiner.de@xxxxxxxxx> wrote: > For DP sinks which don't expose color depth via EDID, use > the drm_dp_sink_bpc() helper to derive the bpc of the sink. > > This should handle DP native sinks with the "Assume 6 bpc if EDID > doesn't tell us" as mandated by DP spec. It gives more accurate > values for DP->legacy converters for HDMI, DVI and VGA. Haswell says no. ug 03 12:58:46 tyrion-bne-redhat-com kernel: fbcon: inteldrmfb (fb0) is primary device Aug 03 12:58:46 tyrion-bne-redhat-com kernel: BUG: unable to handle kernel NULL pointer dereference at 000000000000011b Aug 03 12:58:46 tyrion-bne-redhat-com kernel: IP: [<ffffffffa00e6cf5>] drm_dp_sink_bpc+0x5/0xb0 [drm_kms_helper] Aug 03 12:58:46 tyrion-bne-redhat-com kernel: PGD 0 Aug 03 12:58:46 tyrion-bne-redhat-com kernel: Oops: 0000 [#1] SMP Aug 03 12:58:46 tyrion-bne-redhat-com kernel: Modules linked in: i915 ccm xt_CHECKSUM ipt_MASQUERADE nf_nat_masquerade_ipv4 tun ip6t_rpfilter ip6t_ Aug 03 12:58:46 tyrion-bne-redhat-com kernel: videobuf2_core snd_hda_codec videodev mei_me mei snd_hwdep snd_seq snd_hda_core rtsx_pci media i2c_i Aug 03 12:58:46 tyrion-bne-redhat-com kernel: CPU: 1 PID: 752 Comm: kworker/1:3 Not tainted 4.7.0+ #12 Aug 03 12:58:46 tyrion-bne-redhat-com kernel: Hardware name: LENOVO 20ARS25701/20ARS25701, BIOS GJET72WW (2.22 ) 02/21/2014 Aug 03 12:58:46 tyrion-bne-redhat-com kernel: Workqueue: events_long drm_dp_mst_link_probe_work [drm_kms_helper] Aug 03 12:58:46 tyrion-bne-redhat-com kernel: task: ffff880308583a80 task.stack: ffff880309f20000 Aug 03 12:58:46 tyrion-bne-redhat-com kernel: RIP: 0010:[<ffffffffa00e6cf5>] [<ffffffffa00e6cf5>] drm_dp_sink_bpc+0x5/0xb0 [drm_kms_helper] Aug 03 12:58:46 tyrion-bne-redhat-com kernel: RSP: 0018:ffff880309f23b48 EFLAGS: 00010202 Aug 03 12:58:46 tyrion-bne-redhat-com kernel: RAX: 000000000000000a RBX: 0000000000000006 RCX: 0000000000000000 Aug 03 12:58:46 tyrion-bne-redhat-com kernel: RDX: 0000000000000000 RSI: 0000000000000127 RDI: 0000000000000116 Aug 03 12:58:46 tyrion-bne-redhat-com kernel: RBP: ffff880309f23b50 R08: ffff880309734800 R09: 0000000000000024 Aug 03 12:58:46 tyrion-bne-redhat-com kernel: R10: 0000000000000000 R11: 0000000000000000 R12: ffff880309737800 Aug 03 12:58:46 tyrion-bne-redhat-com kernel: R13: ffff88030a334000 R14: ffff880309737000 R15: ffff880309737800 Aug 03 12:58:46 tyrion-bne-redhat-com kernel: FS: 0000000000000000(0000) GS:ffff88031e240000(0000) knlGS:0000000000000000 Aug 03 12:58:46 tyrion-bne-redhat-com kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Aug 03 12:58:46 tyrion-bne-redhat-com kernel: CR2: 000000000000011b CR3: 0000000001c06000 CR4: 00000000001406e0 Aug 03 12:58:46 tyrion-bne-redhat-com kernel: Stack: Aug 03 12:58:46 tyrion-bne-redhat-com kernel: ffffffffa09d4295 ffff880309f23bd8 ffffffffa09a7c1f ffffffff8122544d Aug 03 12:58:46 tyrion-bne-redhat-com kernel: ffff880306660258 ffff880306660000 0000000009737800 ffff88030a331000 Aug 03 12:58:46 tyrion-bne-redhat-com kernel: 0100880300000024 ffff880309f23bb8 ffffffff00000024 ffff880309737800 Aug 03 12:58:46 tyrion-bne-redhat-com kernel: Call Trace: Aug 03 12:58:46 tyrion-bne-redhat-com kernel: [<ffffffffa09d4295>] ? intel_dp_sink_bpc+0x25/0x30 [i915] Aug 03 12:58:46 tyrion-bne-redhat-com kernel: [<ffffffffa09a7c1f>] intel_atomic_check+0xacf/0x1250 [i915] Aug 03 12:58:46 tyrion-bne-redhat-com kernel: [<ffffffff8122544d>] ? __kmalloc_track_caller+0x12d/0x210 Aug 03 12:58:46 tyrion-bne-redhat-com kernel: [<ffffffffa0097ea7>] drm_atomic_check_only+0x187/0x610 [drm] Aug 03 12:58:46 tyrion-bne-redhat-com kernel: [<ffffffffa0098857>] ? drm_atomic_add_affected_connectors+0x27/0xf0 [drm] Aug 03 12:58:46 tyrion-bne-redhat-com kernel: [<ffffffffa0098347>] drm_atomic_commit+0x17/0x60 [drm] Aug 03 12:58:46 tyrion-bne-redhat-com kernel: [<ffffffffa00f4e0c>] restore_fbdev_mode+0x14c/0x260 [drm_kms_helper] Aug 03 12:58:46 tyrion-bne-redhat-com kernel: [<ffffffffa00f6a23>] drm_fb_helper_restore_fbdev_mode_unlocked+0x33/0x80 [drm_kms_helper] Aug 03 12:58:46 tyrion-bne-redhat-com kernel: [<ffffffffa00f6a9d>] drm_fb_helper_set_par+0x2d/0x50 [drm_kms_helper] Aug 03 12:58:46 tyrion-bne-redhat-com kernel: [<ffffffffa00f69b8>] drm_fb_helper_hotplug_event+0x148/0x180 [drm_kms_helper] Aug 03 12:58:46 tyrion-bne-redhat-com kernel: [<ffffffffa09c238a>] intel_fbdev_output_poll_changed+0x1a/0x20 [i915] Aug 03 12:58:46 tyrion-bne-redhat-com kernel: [<ffffffffa00e79c7>] drm_kms_helper_hotplug_event+0x27/0x30 [drm_kms_helper] Aug 03 12:58:46 tyrion-bne-redhat-com kernel: [<ffffffffa09cafa5>] intel_dp_mst_hotplug+0x15/0x20 [i915] Aug 03 12:58:46 tyrion-bne-redhat-com kernel: [<ffffffffa00ee31a>] drm_dp_send_link_address+0x19a/0x220 [drm_kms_helper] Aug 03 12:58:46 tyrion-bne-redhat-com kernel: [<ffffffff810df553>] ? put_prev_entity+0x33/0x410 Aug 03 12:58:46 tyrion-bne-redhat-com kernel: [<ffffffff8111280b>] ? add_timer_on+0xdb/0x1b0 Aug 03 12:58:46 tyrion-bne-redhat-com kernel: [<ffffffff8102c766>] ? __switch_to+0x2b6/0x600 Aug 03 12:58:46 tyrion-bne-redhat-com kernel: [<ffffffff810e361e>] ? pick_next_task_fair+0x10e/0x4d0 Aug 03 12:58:46 tyrion-bne-redhat-com kernel: [<ffffffffa00ee44d>] drm_dp_check_and_send_link_address+0xad/0xc0 [drm_kms_helper] Aug 03 12:58:46 tyrion-bne-redhat-com kernel: [<ffffffffa00ee4b7>] drm_dp_mst_link_probe_work+0x57/0xb0 [drm_kms_helper] Aug 03 12:58:46 tyrion-bne-redhat-com kernel: [<ffffffff810c086f>] process_one_work+0x15f/0x410 Aug 03 12:58:46 tyrion-bne-redhat-com kernel: [<ffffffff810c0b6e>] worker_thread+0x4e/0x480 Aug 03 12:58:46 tyrion-bne-redhat-com kernel: [<ffffffff810c0b20>] ? process_one_work+0x410/0x410 Aug 03 12:58:46 tyrion-bne-redhat-com kernel: [<ffffffff810c0b20>] ? process_one_work+0x410/0x410 Aug 03 12:58:46 tyrion-bne-redhat-com kernel: [<ffffffff810c64c8>] kthread+0xd8/0xf0 Aug 03 12:58:46 tyrion-bne-redhat-com kernel: [<ffffffff817d527f>] ret_from_fork+0x1f/0x40 Aug 03 12:58:46 tyrion-bne-redhat-com kernel: [<ffffffff810c63f0>] ? kthread_worker_fn+0x170/0x170 Aug 03 12:58:46 tyrion-bne-redhat-com kernel: Code: b8 b0 1e 04 00 48 89 e5 74 11 40 80 ff 14 ba d0 78 02 00 b8 60 3d 08 00 0f 45 c2 5d c3 66 0f 1f Aug 03 12:58:46 tyrion-bne-redhat-com kernel: RIP [<ffffffffa00e6cf5>] drm_dp_sink_bpc+0x5/0xb0 [drm_kms_helper] Aug 03 12:58:46 tyrion-bne-redhat-com kernel: RSP <ffff880309f23b48> Aug 03 12:58:46 tyrion-bne-redhat-com kernel: CR2: 000000000000011b Aug 03 12:58:46 tyrion-bne-redhat-com kernel: ---[ end trace d3270996301ba013 ]--- Possibly MST related. Dave. _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/dri-devel
