[Powerpc] Sam460ex Canyonlands issue -Kernel 4.4.36

[Deucher, Alexander]

> -----Original Message-----
> From: Julian Margetson [mailto:runaway at candw.ms]
> Sent: Monday, December 05, 2016 4:59 PM
> To: Maling list - DRI developers
> Cc: Deucher, Alexander; Daenzer, Michel; daniel.vetter at ffwll.ch
> Subject: [Powerpc] Sam460ex Canyonlands issue -Kernel 4.4.36
> 
> Following  appears with kernel 4.4.36 .
> 
> Maybe as a result of following patch ?
> 
> drm/radeon: Ensure vblank interrupt is enabled on DPMS transition to on

Possibly.  Your platform appears to have problems in general:

[    4.733843] [drm:r600_ring_test] *ERROR* radeon: ring 0 test failed (scratch(0x850C)=0xCAFEDEAD)
[    4.742686] radeon 0001:81:00.0: disabling GPU acceleration

When that happens the driver tears down a bunch of stuff including interrupts and basically falls back to dumb framebuffer mode.  The warning is harmless in this case.  It's basically telling you that the driver refused to enable any interrupts because the interrupt handler is not registered because a bunch of stuff failed to initialize.

Alex

> 
> 
> [    5.331666] Can't enable IRQ/MSI because no handler is installed
> [    5.331842] ------------[ cut here ]------------
> [    5.331847] WARNING: at c048a53c [verbose debug info unavailable]
> [    5.331851] Modules linked in:
> [    5.331859] CPU: 0 PID: 1 Comm: swapper Not tainted 4.4.36-sam460ex-jm
> #1
> [    5.331864] task: ea848000 ti: ea84c000 task.ti: ea84c000
> [    5.331867] NIP: c048a53c LR: c048a53c CTR: 00000000
> [    5.331870] REGS: ea84d6e0 TRAP: 0700   Not tainted (4.4.36-sam460ex-jm)
> [    5.331879] MSR: 00029000 <CE,EE,ME>  CR: 24008222  XER: 00000000
> [    5.331914]
> [    5.331914] GPR00: c048a53c ea84d790 ea848000 00000034 00000000
> 00000000 c0ea7a2c 00000000
> [    5.331914] GPR08: 00029000 00000800 ea84c000 ea84d790 24008222
> 00000000 eaa8096c 00000001
> [    5.331914] GPR16: eaacd9d4 c08e6c20 00000000 00000000 c0c678d7
> 00000000 c0da0000 ea982048
> [    5.331914] GPR24: c08f24c0 ea982108 eaa80984 ea9d4d80 eaa80800
> eaa80800 eabdc000 ea982000
> [    5.331932] NIP [c048a53c] si_irq_set+0x28/0x9e4
> [    5.331937] LR [c048a53c] si_irq_set+0x28/0x9e4
> [    5.331938] Call Trace:
> [    5.331945] [ea84d790] [c048a53c] si_irq_set+0x28/0x9e4 (unreliable)
> [    5.331958] [ea84d7f0] [c0409b20] atombios_crtc_dpms+0x8c/0x104
> [    5.331964] [ea84d810] [c0409bb4] atombios_crtc_commit+0x1c/0x38
> [    5.331972] [ea84d820] [c03c9d90]
> drm_crtc_helper_set_mode+0x36c/0x410
> [    5.331978] [ea84d9f0] [c03ca628]
> drm_crtc_helper_set_config+0x6dc/0x934
> [    5.331991] [ea84da60] [c0423a70] radeon_crtc_set_config+0x50/0xf8
> [    5.332007] [ea84da80] [c03e47b0]
> drm_mode_set_config_internal+0x5c/0xe0
> [    5.332021] [ea84daa0] [c03d4704] restore_fbdev_mode+0x20c/0x25c
> [    5.332030] [ea84dad0] [c03d61ec]
> drm_fb_helper_restore_fbdev_mode_unlocked+0x40/0x8c
> [    5.332036] [ea84daf0] [c03d6284] drm_fb_helper_set_par+0x4c/0x60
> [    5.332047] [ea84db00] [c0388144] fbcon_init+0x318/0x410
> [    5.332056] [ea84db50] [c03b3024] visual_init+0xac/0xf8
> [    5.332063] [ea84db60] [c03b487c] do_bind_con_driver+0x1e8/0x2d8
> [    5.332070] [ea84dbb0] [c03b4cd0] do_take_over_console+0x19c/0x1ac
> [    5.332075] [ea84dbe0] [c03878bc] do_fbcon_takeover+0x80/0xe4
> [    5.332087] [ea84dbf0] [c003c3fc] notifier_call_chain+0x60/0x94
> [    5.332094] [ea84dc10] [c003c71c]
> __blocking_notifier_call_chain+0x50/0x68
> [    5.332104] [ea84dc30] [c038f3a8] register_framebuffer+0x248/0x26c
> [    5.332111] [ea84dc90] [c03d65b4]
> drm_fb_helper_initial_config+0x31c/0x39c
> [    5.332120] [ea84dcd0] [c042bc78] radeon_fbdev_init+0xcc/0xf8
> [    5.332126] [ea84dcf0] [c0425dd0] radeon_modeset_init+0x5a8/0x938
> [    5.332132] [ea84dd50] [c040316c] radeon_driver_load_kms+0xcc/0x184
> [    5.332138] [ea84dd70] [c03df0b8] drm_dev_register+0x84/0xc8
> [    5.332144] [ea84dd90] [c03e0e78] drm_get_pci_dev+0xf4/0x18c
> [    5.332156] [ea84ddb0] [c03719e4] pci_device_probe+0x88/0xe8
> [    5.332164] [ea84ddd0] [c05436f4] driver_probe_device+0x130/0x290
> [    5.332170] [ea84de00] [c05438cc] __driver_attach+0x78/0xa0
> [    5.332188] [ea84de20] [c0541bec] bus_for_each_dev+0x90/0xa0
> [    5.332193] [ea84de50] [c0542dc8] bus_add_driver+0xe0/0x1f0
> [    5.332199] [ea84de70] [c054400c] driver_register+0xb4/0xf8
> [    5.332207] [ea84de90] [c00016f8] do_one_initcall+0x11c/0x1a0
> [    5.332214] [ea84df00] [c0d08acc] kernel_init_freeable+0x130/0x1cc
> [    5.332220] [ea84df30] [c0001cf4] kernel_init+0x14/0xf8
> [    5.332228] [ea84df40] [c000ade4] ret_from_kernel_thread+0x5c/0x64
> [    5.332230] Instruction dump:
> [    5.332241] 7c0803a6 4bb7c1ec 9421ffa0 7c0802a6 bdc10018 90010064
> 894313d0 2f8a0000
> [    5.332251] 40be001c 3c60c0c7 38631c16 483ea6c5 <0fe00000> 3860ffea
> 480009ac 89431aa8
> [    5.332274] ---[ end trace 3fbb08226210324a ]---
> [    5.413526] Console: switching to colour frame buffer device 240x67