PROBLEM: MT8192 panel_edp_probe trace despite recent eDP and aux-bus support patches
Leonard Lausen
leonard at lausen.nl
Wed Sep 20 00:58:07 UTC 2023
Dear AngeloGioacchino, Dear Maintainers,
on MT8192 Asurada Spherion (Acer 514), I observe the following trace related to
eDP and aux-bus during bootup with tags/mediatek-drm-next-6.6 merged to v6.5.4
as well as on plain v6.5.4. Despite the trace, the laptop display works. Given
your recent eDP and aux-bus support patches are included in
tags/mediatek-drm-next-6.6, I thought reporting this may be helpful. (I'm
unable to validate v6.6-rc2 currently, as there's a regression breaking boot.)
[ 3.808189] ------------[ cut here ]------------
[ 3.812840] WARNING: CPU: 7 PID: 10 at drivers/gpu/drm/panel/panel-edp.c:758 panel_edp_probe+0x488/0x4f0
[ 3.822370] Modules linked in:
[ 3.825428] CPU: 7 PID: 10 Comm: kworker/u16:0 Not tainted 6.5.4-cos-mt9+ #1
[ 3.832476] Hardware name: Google Spherion (rev0 - 3) (DT)
[ 3.837959] Workqueue: events_unbound deferred_probe_work_func
[ 3.843797] pstate: 80400009 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
[ 3.850757] pc : panel_edp_probe+0x488/0x4f0
[ 3.855025] lr : panel_edp_probe+0x29c/0x4f0
[ 3.859291] sp : ffff8000800d3710
[ 3.862600] x29: ffff8000800d3710 x28: 0000000000000000 x27: 0000000000000000
[ 3.869737] x26: ffff60b44002d005 x25: ffffa4a68e990418 x24: 0000000000000000
[ 3.875193] usb 1-1: new high-speed USB device number 2 using xhci-mtk
[ 3.876862] x23: ffff60b446542680 x22: ffffa4a68db8d5b0 x21: ffff60b4452d0000
[ 3.876869] x20: 0000000000000000 x19: ffff60b441052480 x18: 00000000000a8360
[ 3.876873] x17: 001fffffffffffff x16: 0000000000000000 x15: 0000000000000001
[ 3.904812] x14: 000000000060f827 x13: 9b00200a4341452d x12: 0000000000000000
[ 3.911948] x11: 0000000000000001 x10: 0000000000000000 x9 : ffff60b446523900
[ 3.919084] x8 : ffff60b446523900 x7 : 00000000435e6d06 x6 : 40395246b460ffff
[ 3.926220] x5 : 0000000000000043 x4 : 000000000000142b x3 : 000000000000004e
[ 3.933356] x2 : 0000000000000000 x1 : ffffa4a68db8d9a0 x0 : 000000000dae142b
[ 3.940492] Call trace:
[ 3.942933] panel_edp_probe+0x488/0x4f0
[ 3.946851] panel_edp_dp_aux_ep_probe+0x38/0x50
[ 3.951466] dp_aux_ep_probe+0x34/0xf4
[ 3.955211] really_probe+0x148/0x2ac
[ 3.958868] __driver_probe_device+0x78/0x12c
[ 3.963221] driver_probe_device+0x3c/0x160
[ 3.967400] __device_attach_driver+0xb8/0x138
[ 3.971841] bus_for_each_drv+0x80/0xdc
[ 3.975672] __device_attach+0x9c/0x188
[ 3.979503] device_initial_probe+0x14/0x20
[ 3.983683] bus_probe_device+0xac/0xb0
[ 3.987515] device_add+0x5bc/0x778
[ 3.990999] device_register+0x20/0x30
[ 3.994742] of_dp_aux_populate_bus+0xc8/0x19c
[ 3.999181] devm_of_dp_aux_populate_bus+0x18/0x80
[ 4.003968] anx7625_i2c_probe+0x7bc/0x9b4
[ 4.008062] i2c_device_probe+0x148/0x290
[ 4.011724] usb 1-1: New USB device found, idVendor=05e3, idProduct=0610, bcdDevice=65.01
[ 4.012062] really_probe+0x148/0x2ac
[ 4.012064] __driver_probe_device+0x78/0x12c
[ 4.020243] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[ 4.023879] driver_probe_device+0x3c/0x160
[ 4.023882] __device_attach_driver+0xb8/0x138
[ 4.023884] bus_for_each_drv+0x80/0xdc
[ 4.028232] usb 1-1: Product: USB2.1 Hub
[ 4.035347] __device_attach+0x9c/0x188
[ 4.035350] device_initial_probe+0x14/0x20
[ 4.035353] bus_probe_device+0xac/0xb0
[ 4.035355] deferred_probe_work_func+0x8c/0xc8
[ 4.039530] usb 1-1: Manufacturer: GenesysLogic
[ 4.043955] process_one_work+0x2d0/0x598
[ 4.048830] hub 1-1:1.0: USB hub found
[ 4.051689] worker_thread+0x70/0x434
[ 4.051691] kthread+0xfc/0x100
[ 4.051693] ret_from_fork+0x10/0x20
[ 4.051699] irq event stamp: 136828
[ 4.051701] hardirqs last enabled at (136827): [<ffffa4a68d991ba4>] _raw_spin_unlock_irqrestore+0x6c/0x98
[ 4.055841] hub 1-1:1.0: 4 ports detected
[ 4.059699] hardirqs last disabled at (136828): [<ffffa4a68d9811e8>] el1_dbg+0x24/0x8c
[ 4.059704] softirqs last enabled at (134796): [<ffffa4a68c810794>] __do_softirq+0x424/0x51c
[ 4.059706] softirqs last disabled at (134787): [<ffffa4a68c816af0>] ____do_softirq+0x10/0x1c
[ 4.059709] ---[ end trace 0000000000000000 ]---
Without your patches, on 6.5.4, the trace looks as follows
[ 3.834478] ------------[ cut here ]------------
[ 3.839126] WARNING: CPU: 5 PID: 10 at drivers/gpu/drm/panel/panel-edp.c:758 panel_edp_probe+0x488/0x4f0
[ 3.848629] Modules linked in:
[ 3.851684] CPU: 5 PID: 10 Comm: kworker/u16:0 Not tainted 6.5.4-cos-mt9 #1
[ 3.858646] Hardware name: Google Spherion (rev0 - 3) (DT)
[ 3.864129] Workqueue: events_unbound deferred_probe_work_func
[ 3.869966] pstate: 80400009 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
[ 3.876927] pc : panel_edp_probe+0x488/0x4f0
[ 3.881195] lr : panel_edp_probe+0x29c/0x4f0
[ 3.885461] sp : ffff8000800d3710
[ 3.888770] x29: ffff8000800d3710 x28: 0000000000000000 x27: 0000000000000000
[ 3.895907] x26: ffff31fec002c005 x25: ffffa839d1b90418 x24: 0000000000000000
[ 3.899112] usb 1-1: new high-speed USB device number 2 using xhci-mtk
[ 3.903031] x23: ffff31fec13fc500 x22: ffffa839d0d8d5b0 x21: ffff31fec51ec000
[ 3.903038] x20: 0000000000000000 x19: ffff31fec536fe80 x18: 0000000000078570
[ 3.903041] x17: 001fffffffffffff x16: 0000000000000000 x15: 0000000000000001
[ 3.930981] x14: 0000000000350cdf x13: 9b00200a4341452d x12: 0000000000000000
[ 3.938117] x11: 0000000000000001 x10: 0000000000000000 x9 : ffff31fec10b2300
[ 3.945253] x8 : ffff31fec10b2300 x7 : 0000000037343f4b x6 : 40230bc1fe31ffff
[ 3.952388] x5 : 0000000000000043 x4 : 000000000000142b x3 : 000000000000004e
[ 3.959524] x2 : 0000000000000000 x1 : ffffa839d0d8d9a0 x0 : 000000000dae142b
[ 3.966660] Call trace:
[ 3.969099] panel_edp_probe+0x488/0x4f0
[ 3.973018] panel_edp_dp_aux_ep_probe+0x38/0x50
[ 3.977633] dp_aux_ep_probe+0x34/0xf4
[ 3.981378] really_probe+0x148/0x2ac
[ 3.985036] __driver_probe_device+0x78/0x12c
[ 3.989390] driver_probe_device+0x3c/0x160
[ 3.993569] __device_attach_driver+0xb8/0x138
[ 3.998009] bus_for_each_drv+0x80/0xdc
[ 4.001840] __device_attach+0x9c/0x188
[ 4.005672] device_initial_probe+0x14/0x20
[ 4.009851] bus_probe_device+0xac/0xb0
[ 4.013682] device_add+0x5bc/0x778
[ 4.017166] device_register+0x20/0x30
[ 4.020911] of_dp_aux_populate_bus+0xc8/0x19c
[ 4.025349] devm_of_dp_aux_populate_bus+0x18/0x80
[ 4.030136] anx7625_i2c_probe+0x7bc/0x9b4
[ 4.034229] i2c_device_probe+0x148/0x290
[ 4.038237] really_probe+0x148/0x2ac
[ 4.038692] usb 1-1: New USB device found, idVendor=05e3, idProduct=0610, bcdDevice=65.01
[ 4.041887] __driver_probe_device+0x78/0x12c
[ 4.041890] driver_probe_device+0x3c/0x160
[ 4.041892] __device_attach_driver+0xb8/0x138
[ 4.041895] bus_for_each_drv+0x80/0xdc
[ 4.041897] __device_attach+0x9c/0x188
[ 4.050077] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0
[ 4.054409] device_initial_probe+0x14/0x20
[ 4.054412] bus_probe_device+0xac/0xb0
[ 4.058588] usb 1-1: Product: USB2.1 Hub
[ 4.063012] deferred_probe_work_func+0x8c/0xc8
[ 4.063014] process_one_work+0x2d0/0x598
[ 4.066841] usb 1-1: Manufacturer: GenesysLogic
[ 4.070658] worker_thread+0x70/0x434
[ 4.070660] kthread+0xfc/0x100
[ 4.070663] ret_from_fork+0x10/0x20
[ 4.078915] hub 1-1:1.0: USB hub found
[ 4.081952] irq event stamp: 141216
[ 4.081953] hardirqs last enabled at (141215): [<ffffa839d0b936a4>] _raw_spin_unlock_irqrestore+0x6c/0x98
[ 4.081960] hardirqs last disabled at (141216): [<ffffa839d0b82ce8>] el1_dbg+0x24/0x8c
[ 4.081965] softirqs last enabled at (140754): [<ffffa839cfa10794>] __do_softirq+0x424/0x51c
[ 4.086058] hub 1-1:1.0: 4 ports detected
[ 4.089700] softirqs last disabled at (140749): [<ffffa839cfa16af0>] ____do_softirq+0x10/0x1c
[ 4.089702] ---[ end trace 0000000000000000 ]---
[ 4.089721] panel-simple-dp-aux aux-3-0058: Unknown panel CMN 0x142b, using conservative timings
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