BTW, I just tried these patches on my T450s (using i915) and I'm seeing some
kernel warnings with them when adding DP aux devices after connecting a new
MST topology to the system:
[ 296.511130] kauditd_printk_skb: 2 callbacks suppressed
[ 296.511135] audit: type=1305 audit(1562960713.086:245): op=set audit_pid=0 old=743 auid=4294967295 ses=4294967295 res=1
[ 296.513594] audit: type=1131 audit(1562960713.088:246): pid=1 uid=0 auid=4294967295 ses=4294967295 msg='unit=auditd comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
[ 298.506015] audit: type=1305 audit(1562960715.080:247): op=set audit_enabled=1 old=1 auid=4294967295 ses=4294967295 res=1
[ 298.506057] audit: type=1305 audit(1562960715.080:248): op=set audit_pid=7270 old=0 auid=4294967295 ses=4294967295 res=1
[ 367.725603] [drm:intel_get_hpd_pins.isra.0 [i915]] hotplug event received, stat 0x00400000, dig 0x10101210, pins 0x00000040, long 0x00000040
[ 367.725684] [drm:intel_hpd_irq_handler [i915]] digital hpd port C - long
[ 367.725760] [drm:intel_hpd_irq_handler [i915]] Received HPD interrupt on PIN 6 - cnt: 10
[ 367.725888] [drm:intel_dp_hpd_pulse [i915]] got hpd irq on port C - long
[ 367.725977] [drm:i915_hotplug_work_func [i915]] running encoder hotplug functions
[ 367.726068] [drm:i915_hotplug_work_func [i915]] Connector DP-2 (pin 6) received hotplug event.
[ 367.726165] [drm:intel_dp_detect [i915]] [CONNECTOR:86:DP-2]
[ 367.726679] [drm:drm_dp_dpcd_read [drm_kms_helper]] DPDDC-C: 0x00000 AUX -> (ret= 15) 12 14 c4 01 00 05 01 83 02 00 00 00 00 00 04
[ 367.726748] [drm:intel_dp_read_dpcd [i915]] DPCD: 12 14 c4 01 00 05 01 83 02 00 00 00 00 00 04
[ 367.727117] [drm:drm_dp_dpcd_read [drm_kms_helper]] DPDDC-C: 0x00200 AUX -> (ret= 1) 01
[ 367.727787] [drm:drm_dp_dpcd_read [drm_kms_helper]] DPDDC-C: 0x00080 AUX -> (ret= 16) 08 0d 0d 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 367.727886] [drm:intel_dp_print_rates [i915]] source rates: 162000, 270000, 540000
[ 367.727974] [drm:intel_dp_print_rates [i915]] sink rates: 162000, 270000, 540000
[ 367.728047] [drm:intel_dp_print_rates [i915]] common rates: 162000, 270000, 540000
[ 367.728548] [drm:drm_dp_dpcd_read [drm_kms_helper]] DPDDC-C: 0x00500 AUX -> (ret= 12) 90 cc 24 53 59 4e 41 23 22 10 02 1d
[ 367.728597] [drm:drm_dp_read_desc [drm_kms_helper]] DP branch: OUI 90-cc-24 dev-ID SYNA#" HW-rev 1.0 SW-rev 2.29 quirks 0x0000
[ 367.729069] [drm:drm_dp_dpcd_read [drm_kms_helper]] DPDDC-C: 0x00021 AUX -> (ret= 1) 01
[ 367.729159] [drm:intel_dp_detect [i915]] MST support? port C: yes, sink: yes, modparam: yes
[ 367.729805] [drm:drm_dp_dpcd_read [drm_kms_helper]] DPDDC-C: 0x00000 AUX -> (ret= 15) 12 14 c4 01 00 05 01 83 02 00 00 00 00 00 04
[ 367.729830] [drm:drm_dp_mst_topology_mgr_set_mst [drm_kms_helper]] mstb 000000001b4abbfa (2)
[ 367.730301] [drm:drm_dp_dpcd_write [drm_kms_helper]] DPDDC-C: 0x00111 AUX <- (ret= 1) 07
[ 367.730868] [drm:drm_dp_dpcd_write [drm_kms_helper]] DPDDC-C: 0x002c0 AUX <- (ret= 1) 01
[ 367.731086] [drm:drm_dp_dpcd_write [drm_kms_helper]] DPDDC-C: 0x001c0 AUX <- (ret= 3) 00 00 3f
[ 367.731432] [drm:drm_dp_dpcd_read [drm_kms_helper]] DPDDC-C: 0x002c0 AUX -> (ret= 1) 01
[ 367.731448] [drm:drm_dp_mst_topology_put_mstb [drm_kms_helper]] mstb 000000001b4abbfa (1)
[ 367.731521] [drm:i915_hotplug_work_func [i915]] Connector HDMI-A-2 (pin 6) received hotplug event.
[ 367.731587] [drm:intel_hdmi_detect [i915]] [CONNECTOR:91:HDMI-A-2]
[ 367.731784] [drm:drm_dp_mst_topology_try_get_mstb.part.0 [drm_kms_helper]] mstb 000000001b4abbfa (2)
[ 367.732133] [drm:drm_dp_dpcd_write [drm_kms_helper]] DPDDC-C: 0x01000 AUX <- (ret= 5) 10 02 cb 01 d5
[ 367.732249] [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpc] NAK for addr: 0050 w(1)
[ 367.732328] [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpc] NAK on first message, retry
[ 367.732568] [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpc] NAK for addr: 0050 w(1)
[ 367.732630] [drm:drm_do_probe_ddc_edid [drm]] drm: skipping non-existent adapter i915 gmbus dpc
[ 367.732726] [drm:intel_hdmi_set_edid [i915]] HDMI GMBUS EDID read failed, retry using GPIO bit-banging
[ 367.732820] [drm:intel_gmbus_force_bit [i915]] enabling bit-banging on i915 gmbus dpc. force bit now 1
[ 367.733406] [drm:intel_get_hpd_pins.isra.0 [i915]] hotplug event received, stat 0x00400000, dig 0x10101110, pins 0x00000040, long 0x00000000
[ 367.733491] [drm:intel_hpd_irq_handler [i915]] digital hpd port C - short
[ 367.733616] [drm:intel_dp_hpd_pulse [i915]] got hpd irq on port C - short
[ 367.733711] [drm:drm_do_probe_ddc_edid [drm]] drm: skipping non-existent adapter i915 gmbus dpc
[ 367.733826] [drm:intel_gmbus_force_bit [i915]] disabling bit-banging on i915 gmbus dpc. force bit now 0
[ 367.734104] [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpc] NAK for addr: 0040 w(1)
[ 367.734197] [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpc] NAK on first message, retry
[ 367.734234] [drm:drm_dp_dpcd_read [drm_kms_helper]] DPDDC-C: 0x02002 AUX -> (ret= 14) 01 10 00 00 00 00 00 00 00 00 00 00 80 00
[ 367.734335] [drm:intel_dp_hpd_pulse [i915]] got esi 01 10 00
[ 367.734510] [drm:do_gmbus_xfer [i915]] GMBUS [i915 gmbus dpc] NAK for addr: 0040 w(1)
[ 367.734539] [drm:drm_dp_dual_mode_detect [drm_kms_helper]] DP dual mode HDMI ID: (err -6)
[ 367.734893] [drm:drm_dp_dpcd_read [drm_kms_helper]] DPDDC-C: 0x01400 AUX -> (ret= 16) 10 2d 8c 01 00 00 00 00 00 00 00 00 00 00 00 00
[ 367.735446] [drm:drm_dp_dpcd_read [drm_kms_helper]] DPDDC-C: 0x01410 AUX -> (ret= 16) 00 00 00 00 04 90 c0 31 40 11 00 00 00 00 00 00
[ 367.735994] [drm:drm_dp_dpcd_read [drm_kms_helper]] DPDDC-C: 0x01420 AUX -> (ret= 16) 00 00 00 00 00 00 00 00 00 00 11 02 00 00 00 16
[ 367.736229] [drm:drm_dp_dpcd_write [drm_kms_helper]] DPDDC-C: 0x02003 AUX <- (ret= 3) 10 00 00
[ 367.736713] [drm:drm_dp_dpcd_read [drm_kms_helper]] DPDDC-C: 0x02002 AUX -> (ret= 14) 01 00 00 00 00 00 00 00 00 00 00 00 80 00
[ 367.736737] [drm:intel_dp_hpd_pulse [i915]] got esi2 01 00 00
[ 367.736756] [drm:intel_dp_hpd_pulse [i915]] got esi 01 00 00
[ 367.737420] [drm:intel_get_hpd_pins.isra.0 [i915]] hotplug event received, stat 0x00400000, dig 0x10101110, pins 0x00000040, long 0x00000000
[ 367.737441] [drm:intel_hpd_irq_handler [i915]] digital hpd port C - short
[ 367.737468] [drm:intel_dp_hpd_pulse [i915]] got hpd irq on port C - short
[ 367.737939] [drm:drm_dp_dpcd_read [drm_kms_helper]] DPDDC-C: 0x02002 AUX -> (ret= 14) 01 10 00 00 00 00 00 00 00 00 00 00 80 00
[ 367.737961] [drm:intel_dp_hpd_pulse [i915]] got esi 01 10 00
[ 367.738452] [drm:drm_dp_dpcd_read [drm_kms_helper]] DPDDC-C: 0x01400 AUX -> (ret= 16) 10 25 45 00 00 00 00 00 00 00 00 00 00 00 00 00
[ 367.738940] [drm:drm_dp_dpcd_read [drm_kms_helper]] DPDDC-C: 0x01410 AUX -> (ret= 16) 00 00 00 03 00 00 00 00 00 00 00 00 00 00 00 00
[ 367.739331] [drm:drm_dp_dpcd_read [drm_kms_helper]] DPDDC-C: 0x01420 AUX -> (ret= 8) 00 00 00 00 00 00 00 a9
[ 367.739336] [drm:drm_dp_mst_topology_try_get_mstb.part.0 [drm_kms_helper]] mstb 000000001b4abbfa (3)
[ 367.739340] [drm:drm_dp_mst_topology_put_mstb [drm_kms_helper]] mstb 000000001b4abbfa (2)
[ 367.739372] [drm:drm_dp_send_link_address [drm_kms_helper]] link address reply: 4
[ 367.739378] [drm:drm_dp_send_link_address [drm_kms_helper]] port 0: input 1, pdt: 1, pn: 0, dpcd_rev: 00, mcs: 1, ddps: 1, ldps 0, sdp 0/0
[ 367.739384] [drm:drm_dp_send_link_address [drm_kms_helper]] port 1: input 0, pdt: 3, pn: 1, dpcd_rev: 11, mcs: 0, ddps: 1, ldps 0, sdp 1/1
[ 367.739390] [drm:drm_dp_send_link_address [drm_kms_helper]] port 2: input 0, pdt: 0, pn: 2, dpcd_rev: 00, mcs: 0, ddps: 0, ldps 0, sdp 0/0
[ 367.739396] [drm:drm_dp_send_link_address [drm_kms_helper]] port 3: input 0, pdt: 0, pn: 3, dpcd_rev: 00, mcs: 0, ddps: 0, ldps 0, sdp 0/0
[ 367.739531] [drm:drm_dp_dpcd_write [drm_kms_helper]] DPDDC-C: 0x02003 AUX <- (ret= 3) 10 00 00
[ 367.739986] [drm:drm_dp_dpcd_write [drm_kms_helper]] DPDDC-C: 0x00030 AUX <- (ret= 16) 31 08 01 00 01 00 00 00 31 08 01 00 01 00 00 00
[ 367.739991] [drm:drm_dp_add_port [drm_kms_helper]] mstb 000000001b4abbfa (2)
[ 367.739997] [drm:drm_dp_add_port [drm_kms_helper]] port 000000007ac74091 (2)
[ 367.740002] [drm:drm_dp_mst_topology_put_port [drm_kms_helper]] port 000000007ac74091 (1)
[ 367.740009] [drm:drm_dp_add_port [drm_kms_helper]] mstb 000000001b4abbfa (3)
[ 367.740014] [drm:drm_dp_add_port [drm_kms_helper]] port 000000006e23aef3 (2)
[ 367.740289] [drm:drm_dp_dpcd_read [drm_kms_helper]] DPDDC-C: 0x02002 AUX -> (ret= 14) 01 00 00 00 00 00 00 00 00 00 00 00 80 00
[ 367.740314] [drm:intel_dp_hpd_pulse [i915]] got esi2 01 00 00
[ 367.740337] [drm:intel_dp_hpd_pulse [i915]] got esi 01 00 00
[ 367.740497] [drm:drm_dp_dpcd_write [drm_kms_helper]] DPDDC-C: 0x01000 AUX <- (ret= 6) 10 43 d4 10 10 e2
[ 367.741445] [drm:intel_get_hpd_pins.isra.0 [i915]] hotplug event received, stat 0x00400000, dig 0x10101110, pins 0x00000040, long 0x00000000
[ 367.741462] [drm:intel_hpd_irq_handler [i915]] digital hpd port C - short
[ 367.741482] [drm:intel_dp_hpd_pulse [i915]] got hpd irq on port C - short
[ 367.741939] [drm:drm_dp_dpcd_read [drm_kms_helper]] DPDDC-C: 0x02002 AUX -> (ret= 14) 01 10 00 00 00 00 00 00 00 00 00 00 80 00
[ 367.741958] [drm:intel_dp_hpd_pulse [i915]] got esi 01 10 00
[ 367.742447] [drm:drm_dp_dpcd_read [drm_kms_helper]] DPDDC-C: 0x01400 AUX -> (ret= 16) 10 47 d3 10 10 05 00 05 00 3c 00 00 00 00 00 00
[ 367.742452] [drm:drm_dp_mst_topology_try_get_mstb.part.0 [drm_kms_helper]] mstb 000000001b4abbfa (3)
[ 367.742456] [drm:drm_dp_mst_topology_put_mstb [drm_kms_helper]] mstb 000000001b4abbfa (2)
[ 367.742471] [drm:drm_dp_send_enum_path_resources.isra.0 [drm_kms_helper]] enum path resources 1: 1280 1280
[ 367.742526] [drm:drm_dp_mst_get_port_malloc [drm_kms_helper]] port 000000006e23aef3 (2)
[ 367.742571] WARNING: CPU: 2 PID: 442 at drivers/gpu/drm/drm_mode_object.c:45 __drm_mode_object_add+0xaa/0xb0 [drm]
[ 367.742651] Modules linked in: vfat fat joydev rmi_smbus rmi_core i915 wmi_bmof iTCO_wdt intel_rapl x86_pkg_temp_thermal i2c_algo_bit coretemp drm_kms_helper crc32_pclmul syscopyarea sysfillrect sysimgblt psmouse fb_sys_fops i2c_i801 drm i2c_core lpc_ich mei_me mfd_core thinkpad_acpi mei ledtrig_audio wmi tpm_tis tpm_tis_core tpm video pcc_cpufreq crc32c_intel serio_raw ehci_pci ehci_hcd xhci_pci xhci_hcd
[ 367.742859] CPU: 2 PID: 442 Comm: kworker/2:3 Kdump: loaded Not tainted 5.2.0Lyude-Test+ #1
[ 367.742905] Hardware name: LENOVO 20BWS1KY00/20BWS1KY00, BIOS JBET71WW (1.35 ) 09/14/2018
[ 367.742957] Workqueue: events_long drm_dp_mst_link_probe_work [drm_kms_helper]
[ 367.743011] RIP: 0010:__drm_mode_object_add+0xaa/0xb0 [drm]
[ 367.743044] Code: 41 c7 44 24 10 01 00 00 00 4c 89 ff e8 4f 58 6b e1 85 db b8 00 00 00 00 0f 4e c3 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> 0b eb 82 66 90 0f 1f 44 00 00 55 45 31 c0 b9 01 00 00 00 48 89
[ 367.743143] RSP: 0018:ffffc90000447b68 EFLAGS: 00010246
[ 367.743174] RAX: ffff888319350df0 RBX: ffff88830a840000 RCX: 0000000000000001
[ 367.743214] RDX: 00000000b0b0b0b0 RSI: ffff888313ad2e90 RDI: ffff88830a840000
[ 367.743254] RBP: ffffc90000447b98 R08: 0000000000000000 R09: ffff888319350df0
[ 367.743294] R10: 0000000000000000 R11: 0000000000000000 R12: ffff888313ad2e90
[ 367.743334] R13: 0000000000000001 R14: 0000000000000000 R15: ffffffffa01b0d7a
[ 367.743375] FS: 0000000000000000(0000) GS:ffff88831da80000(0000) knlGS:0000000000000000
[ 367.743421] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 367.743453] CR2: 00007f733dd19d88 CR3: 000000000220a006 CR4: 00000000003606e0
[ 367.743494] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 367.743534] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 367.743575] Call Trace:
[ 367.743604] drm_mode_object_add+0x16/0x20 [drm]
[ 367.743643] drm_property_create+0xd4/0x1b0 [drm]
[ 367.743682] drm_property_create_range+0x1f/0x40 [drm]
[ 367.743722] drm_connector_attach_max_bpc_property+0x69/0x90 [drm]
[ 367.743784] intel_dp_add_mst_connector+0x130/0x140 [i915]
[ 367.743822] drm_dp_add_port+0x222/0x490 [drm_kms_helper]
[ 367.743856] ? memory_bm_create+0x1d1/0x4a0
[ 367.743886] ? drm_dp_dpcd_write+0x61/0xb0 [drm_kms_helper]
[ 367.743930] ? drm_dbg+0x87/0x90 [drm]
[ 367.743958] ? drm_dp_dpcd_write+0x61/0xb0 [drm_kms_helper]
[ 367.743996] drm_dp_send_link_address+0x162/0x1c0 [drm_kms_helper]
[ 367.744037] drm_dp_check_and_send_link_address+0xa2/0xb0 [drm_kms_helper]
[ 367.744081] drm_dp_mst_link_probe_work+0x69/0x90 [drm_kms_helper]
[ 367.744118] process_one_work+0x198/0x380
[ 367.744143] worker_thread+0x4d/0x3a0
[ 367.744166] kthread+0x106/0x140
[ 367.744188] ? process_one_work+0x380/0x380
[ 367.744213] ? kthread_park+0x90/0x90
[ 367.744237] ret_from_fork+0x35/0x40
[ 367.744272] WARNING: CPU: 2 PID: 442 at drivers/gpu/drm/drm_mode_object.c:45 __drm_mode_object_add+0xaa/0xb0 [drm]
[ 367.744330] ---[ end trace 314c8adc7c8ca583 ]---
[ 367.744396] [drm:drm_sysfs_connector_add [drm]] adding "DP-3" to sysfs
[ 367.744406] [drm:drm_sysfs_hotplug_event [drm]] generating hotplug event
[ 367.744426] [drm:drm_dp_mst_connector_late_register [drm_kms_helper]] registering DPMST remote bus for card0-DP-3
[ 367.744454] [drm:drm_dp_dpcd_write [drm_kms_helper]] DPDDC-C: 0x02003 AUX <- (ret= 3) 10 00 00
[ 367.744908] [drm:drm_dp_dpcd_read [drm_kms_helper]] DPDDC-C: 0x02002 AUX -> (ret= 14) 01 00 00 00 00 00 00 00 00 00 00 00 80 00
[ 367.744927] [drm:intel_dp_hpd_pulse [i915]] got esi2 01 00 00
[ 367.744944] [drm:intel_dp_hpd_pulse [i915]] got esi 01 00 00
[ 367.745595] [drm:drm_dp_aux_register_devnode [drm_kms_helper]] drm_dp_aux_dev: aux [DPMST] registered as minor 3
[ 367.745601] [drm:drm_dp_mst_topology_put_port [drm_kms_helper]] port 000000006e23aef3 (1)
[ 367.745605] [drm:drm_dp_add_port [drm_kms_helper]] mstb 000000001b4abbfa (4)
[ 367.745609] [drm:drm_dp_add_port [drm_kms_helper]] port 0000000024a17a86 (2)
[ 367.745613] [drm:drm_dp_mst_get_port_malloc [drm_kms_helper]] port 0000000024a17a86 (2)
[ 367.745635] WARNING: CPU: 2 PID: 442 at drivers/gpu/drm/drm_mode_object.c:45 __drm_mode_object_add+0xaa/0xb0 [drm]
[ 367.745668] Modules linked in: vfat fat joydev rmi_smbus rmi_core i915 wmi_bmof iTCO_wdt intel_rapl x86_pkg_temp_thermal i2c_algo_bit coretemp drm_kms_helper crc32_pclmul syscopyarea sysfillrect sysimgblt psmouse fb_sys_fops i2c_i801 drm i2c_core lpc_ich mei_me mfd_core thinkpad_acpi mei ledtrig_audio wmi tpm_tis tpm_tis_core tpm video pcc_cpufreq crc32c_intel serio_raw ehci_pci ehci_hcd xhci_pci xhci_hcd
[ 367.745774] CPU: 2 PID: 442 Comm: kworker/2:3 Kdump: loaded Tainted: G W 5.2.0Lyude-Test+ #1
[ 367.745802] Hardware name: LENOVO 20BWS1KY00/20BWS1KY00, BIOS JBET71WW (1.35 ) 09/14/2018
[ 367.745847] Workqueue: events_long drm_dp_mst_link_probe_work [drm_kms_helper]
[ 367.745899] RIP: 0010:__drm_mode_object_add+0xaa/0xb0 [drm]
[ 367.745931] Code: 41 c7 44 24 10 01 00 00 00 4c 89 ff e8 4f 58 6b e1 85 db b8 00 00 00 00 0f 4e c3 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> 0b eb 82 66 90 0f 1f 44 00 00 55 45 31 c0 b9 01 00 00 00 48 89
[ 367.746022] RSP: 0018:ffffc90000447b68 EFLAGS: 00010246
[ 367.746052] RAX: ffff888319350d90 RBX: ffff88830a840000 RCX: 0000000000000001
[ 367.746090] RDX: 00000000b0b0b0b0 RSI: ffff888313ad2c90 RDI: ffff88830a840000
[ 367.746128] RBP: ffffc90000447b98 R08: 0000000000000000 R09: ffff888319350d90
[ 367.746165] R10: 0000000000000000 R11: 0000000000000000 R12: ffff888313ad2c90
[ 367.746204] R13: 0000000000000001 R14: 0000000000000000 R15: ffffffffa01b0d7a
[ 367.746242] FS: 0000000000000000(0000) GS:ffff88831da80000(0000) knlGS:0000000000000000
[ 367.746285] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 367.748602] CR2: 00007f733dd19d88 CR3: 00000003190ba003 CR4: 00000000003606e0
[ 367.750927] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 367.753249] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 367.755581] Call Trace:
[ 367.757571] drm_mode_object_add+0x16/0x20 [drm]
[ 367.759275] drm_property_create+0xd4/0x1b0 [drm]
[ 367.761414] drm_property_create_range+0x1f/0x40 [drm]
[ 367.763605] drm_connector_attach_max_bpc_property+0x69/0x90 [drm]
[ 367.765862] intel_dp_add_mst_connector+0x130/0x140 [i915]
[ 367.768061] drm_dp_add_port+0x222/0x490 [drm_kms_helper]
[ 367.770256] ? memory_bm_create+0x1d2/0x4a0
[ 367.772428] ? drm_dp_dpcd_write+0x61/0xb0 [drm_kms_helper]
[ 367.774552] ? drm_dbg+0x87/0x90 [drm]
[ 367.776554] ? drm_dp_dpcd_write+0x61/0xb0 [drm_kms_helper]
[ 367.777972] drm_dp_send_link_address+0x162/0x1c0 [drm_kms_helper]
[ 367.779153] drm_dp_check_and_send_link_address+0xa2/0xb0 [drm_kms_helper]
[ 367.780406] drm_dp_mst_link_probe_work+0x69/0x90 [drm_kms_helper]
[ 367.781512] process_one_work+0x198/0x380
[ 367.782566] worker_thread+0x4d/0x3a0
[ 367.783619] kthread+0x106/0x140
[ 367.784656] ? process_one_work+0x380/0x380
[ 367.785693] ? kthread_park+0x90/0x90
[ 367.786728] ret_from_fork+0x35/0x40
[ 367.787775] WARNING: CPU: 2 PID: 442 at drivers/gpu/drm/drm_mode_object.c:45 __drm_mode_object_add+0xaa/0xb0 [drm]
[ 367.788839] ---[ end trace 314c8adc7c8ca584 ]---
[ 367.790031] [drm:drm_sysfs_connector_add [drm]] adding "DP-4" to sysfs
[ 367.790043] [drm:drm_sysfs_hotplug_event [drm]] generating hotplug event
[ 367.790066] [drm:drm_dp_mst_connector_late_register [drm_kms_helper]] registering DPMST remote bus for card0-DP-4
[ 367.790107] [drm:drm_dp_aux_register_devnode [drm_kms_helper]] drm_dp_aux_dev: aux [DPMST] registered as minor 4
[ 367.790115] [drm:drm_dp_mst_topology_put_port [drm_kms_helper]] port 0000000024a17a86 (1)
[ 367.790124] [drm:drm_dp_add_port [drm_kms_helper]] mstb 000000001b4abbfa (5)
[ 367.790130] [drm:drm_dp_add_port [drm_kms_helper]] port 00000000b8b9df74 (2)
[ 367.790137] [drm:drm_dp_mst_get_port_malloc [drm_kms_helper]] port 00000000b8b9df74 (2)
[ 367.790169] WARNING: CPU: 2 PID: 442 at drivers/gpu/drm/drm_mode_object.c:45 __drm_mode_object_add+0xaa/0xb0 [drm]
[ 367.791436] Modules linked in: vfat fat joydev rmi_smbus rmi_core i915 wmi_bmof iTCO_wdt intel_rapl x86_pkg_temp_thermal i2c_algo_bit coretemp drm_kms_helper crc32_pclmul syscopyarea sysfillrect sysimgblt psmouse fb_sys_fops i2c_i801 drm i2c_core lpc_ich mei_me mfd_core thinkpad_acpi mei ledtrig_audio wmi tpm_tis tpm_tis_core tpm video pcc_cpufreq crc32c_intel serio_raw ehci_pci ehci_hcd xhci_pci xhci_hcd
[ 367.793914] CPU: 2 PID: 442 Comm: kworker/2:3 Kdump: loaded Tainted: G W 5.2.0Lyude-Test+ #1
[ 367.795127] Hardware name: LENOVO 20BWS1KY00/20BWS1KY00, BIOS JBET71WW (1.35 ) 09/14/2018
[ 367.796330] Workqueue: events_long drm_dp_mst_link_probe_work [drm_kms_helper]
[ 367.797554] RIP: 0010:__drm_mode_object_add+0xaa/0xb0 [drm]
[ 367.798774] Code: 41 c7 44 24 10 01 00 00 00 4c 89 ff e8 4f 58 6b e1 85 db b8 00 00 00 00 0f 4e c3 48 83 c4 08 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <0f> 0b eb 82 66 90 0f 1f 44 00 00 55 45 31 c0 b9 01 00 00 00 48 89
[ 367.800047] RSP: 0018:ffffc90000447b68 EFLAGS: 00010246
[ 367.801322] RAX: ffff8883193421a0 RBX: ffff88830a840000 RCX: 0000000000000001
[ 367.802629] RDX: 00000000b0b0b0b0 RSI: ffff888313ad2890 RDI: ffff88830a840000
[ 367.803915] RBP: ffffc90000447b98 R08: 0000000000000000 R09: ffff8883193421a0
[ 367.805202] R10: 0000000000000000 R11: 0000000000000000 R12: ffff888313ad2890
[ 367.806489] R13: 0000000000000001 R14: 0000000000000000 R15: ffffffffa01b0d7a
[ 367.807793] FS: 0000000000000000(0000) GS:ffff88831da80000(0000) knlGS:0000000000000000
[ 367.809080] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[ 367.810363] CR2: 00007f733dd19d88 CR3: 00000003190ba003 CR4: 00000000003606e0
[ 367.811675] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 367.812962] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[ 367.814248] Call Trace:
[ 367.815554] drm_mode_object_add+0x16/0x20 [drm]
[ 367.816862] drm_property_create+0xd4/0x1b0 [drm]
[ 367.818167] drm_property_create_range+0x1f/0x40 [drm]
[ 367.819466] drm_connector_attach_max_bpc_property+0x69/0x90 [drm]
[ 367.820790] intel_dp_add_mst_connector+0x130/0x140 [i915]
[ 367.822190] drm_dp_add_port+0x222/0x490 [drm_kms_helper]
[ 367.823451] ? memory_bm_create+0x1d3/0x4a0
[ 367.824692] ? drm_dp_dpcd_write+0x61/0xb0 [drm_kms_helper]
[ 367.825877] ? drm_dbg+0x87/0x90 [drm]
[ 367.827026] ? drm_dp_dpcd_write+0x61/0xb0 [drm_kms_helper]
[ 367.828168] drm_dp_send_link_address+0x162/0x1c0 [drm_kms_helper]
[ 367.829305] drm_dp_check_and_send_link_address+0xa2/0xb0 [drm_kms_helper]
[ 367.830440] drm_dp_mst_link_probe_work+0x69/0x90 [drm_kms_helper]
[ 367.831552] process_one_work+0x198/0x380
[ 367.832620] worker_thread+0x4d/0x3a0
[ 367.833671] kthread+0x106/0x140
[ 367.834714] ? process_one_work+0x380/0x380
[ 367.835756] ? kthread_park+0x90/0x90
[ 367.836799] ret_from_fork+0x35/0x40
[ 367.837851] WARNING: CPU: 2 PID: 442 at drivers/gpu/drm/drm_mode_object.c:45 __drm_mode_object_add+0xaa/0xb0 [drm]
[ 367.838919] ---[ end trace 314c8adc7c8ca585 ]---
[ 367.840066] [drm:drm_sysfs_connector_add [drm]] adding "DP-5" to sysfs
[ 367.840078] [drm:drm_sysfs_hotplug_event [drm]] generating hotplug event
[ 367.840101] [drm:drm_dp_mst_connector_late_register [drm_kms_helper]] registering DPMST remote bus for card0-DP-5
[ 367.840152] [drm:drm_dp_aux_register_devnode [drm_kms_helper]] drm_dp_aux_dev: aux [DPMST] registered as minor 5
[ 367.840164] [drm:drm_dp_mst_topology_put_port [drm_kms_helper]] port 00000000b8b9df74 (1)
[ 367.840176] [drm:drm_sysfs_hotplug_event [drm]] generating hotplug event
[ 367.840189] [drm:drm_fb_helper_hotplug_event.part.0 [drm_kms_helper]]
[ 367.840202] [drm:drm_client_modeset_probe [drm]]
[ 367.840223] [drm:drm_mode_object_get [drm]] OBJ ID: 68 (4)
[ 367.840237] [drm:drm_mode_object_get [drm]] OBJ ID: 74 (2)
[ 367.840250] [drm:drm_mode_object_get [drm]] OBJ ID: 80 (2)
[ 367.840266] [drm:drm_mode_object_get [drm]] OBJ ID: 86 (2)
[ 367.840279] [drm:drm_mode_object_get [drm]] OBJ ID: 91 (2)
[ 367.840291] [drm:drm_mode_object_get [drm]] OBJ ID: 94 (2)
[ 367.840304] [drm:drm_mode_object_get [drm]] OBJ ID: 99 (2)
[ 367.840329] [drm:drm_mode_object_get [drm]] OBJ ID: 102 (2)
On Thu, 2019-07-04 at 15:05 -0400, sunpeng.li@xxxxxxx wrote:
> From: Leo Li <sunpeng.li@xxxxxxx>
>
> Implement late_register and early_unregister hooks for MST connectors.
> Call drm helpers for MST connector registration, which registers the
> AUX devices.
>
> Signed-off-by: Leo Li <sunpeng.li@xxxxxxx>
> ---
> drivers/gpu/drm/i915/display/intel_dp_mst.c | 29 +++++++++++++++++++--
> 1 file changed, 27 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c
> b/drivers/gpu/drm/i915/display/intel_dp_mst.c
> index 60652ebbdf61..be309016f746 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
> @@ -400,13 +400,38 @@ intel_dp_mst_detect(struct drm_connector *connector,
> bool force)
> intel_connector->port);
> }
>
> +static int
> +intel_dp_mst_connector_late_register(struct drm_connector *connector)
> +{
> + struct intel_connector *intel_connector =
> to_intel_connector(connector);
> + struct drm_dp_mst_port *port = intel_connector->port;
> +
> + int ret;
> +
> + ret = intel_connector_register(connector);
> + if (ret)
> + return ret;
> +
> + return drm_dp_mst_connector_late_register(connector, port);
> +}
> +
> +static void
> +intel_dp_mst_connector_early_unregister(struct drm_connector *connector)
> +{
> + struct intel_connector *intel_connector =
> to_intel_connector(connector);
> + struct drm_dp_mst_port *port = intel_connector->port;
> +
> + drm_dp_mst_connector_early_unregister(connector, port);
> + intel_connector_unregister(connector);
> +}
> +
> static const struct drm_connector_funcs intel_dp_mst_connector_funcs = {
> .detect = intel_dp_mst_detect,
> .fill_modes = drm_helper_probe_single_connector_modes,
> .atomic_get_property = intel_digital_connector_atomic_get_property,
> .atomic_set_property = intel_digital_connector_atomic_set_property,
> - .late_register = intel_connector_register,
> - .early_unregister = intel_connector_unregister,
> + .late_register = intel_dp_mst_connector_late_register,
> + .early_unregister = intel_dp_mst_connector_early_unregister,
> .destroy = intel_connector_destroy,
> .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
> .atomic_duplicate_state = intel_digital_connector_duplicate_state,
--
Cheers,
Lyude Paul
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