[BUG/REGRESSION] Radeon HDMI casuses oops on Acube Sam460ex amcc 460ex power board

[Julian Margetson <runaway@candw.ms>]

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Kernels 4.03 and 4.04  oops with HDMI connection on Acube Sam460ex amcc 
460ex powerpc  board.

016a255b7835ee7e49a3eba3c14ba0bc0221a4f8 is the first bad commit

commit 016a255b7835ee7e49a3eba3c14ba0bc0221a4f8
Author: Alex Deucher <alexander.deucher@amd.com>
Date:   Tue Apr 7 09:52:42 2015 -0400

     drm/radeon: only mark audio as connected if the monitor supports it (v3)
     
     commit 0f55db36d49d45b80eff0c0a2a498766016f458b upstream.
     
     Otherwise the driver may try and send audio which may confuse the
     monitor.
     
     v2: set pin to NULL if no audio
     v3: avoid crash with analog encoders
     
     Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
     Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

:040000 040000 de0366a6790f5c91d175bcb89cb34956bbe72b26 bbdb5734961f824558152c7c34a840c78bc3a9a9 M	drivers



[    2.587570] Linux agpgart interface v0.103
[    2.591997] [drm] Initialized drm 1.1.0 20060810
[    2.596892] [drm] radeon kernel modesetting enabled.
[    2.602989] [drm] initializing kernel modesetting (VERDE 0x1002:0x683F 0x1545:0x7750).
[    2.611161] [drm] register mmio base: 0xe90000000
[    2.615935] [drm] register mmio size: 262144
[    2.952043] ATOM BIOS: C44501
[    2.955323] radeon 0001:81:00.0: VRAM: 1024M 0x0000000000000000 - 0x000000003FFFFFFF (1024M used)
[    2.964253] radeon 0001:81:00.0: GTT: 1024M 0x0000000040000000 - 0x000000007FFFFFFF
[    2.971938] [drm] Detected VRAM RAM=1024M, BAR=256M
[    2.976840] [drm] RAM width 128bits DDR
[    2.980898] [TTM] Zone  kernel: Available graphics memory: 379358 kiB
[    2.987383] [TTM] Zone highmem: Available graphics memory: 1034718 kiB
[    2.993934] [TTM] Initializing pool allocator
[    2.998331] [TTM] Initializing DMA pool allocator
[    3.003153] [drm] radeon: 1024M of VRAM memory ready
[    3.008162] [drm] radeon: 1024M of GTT memory ready.
[    3.013203] [drm] Loading verde Microcode
[    3.017266] [drm] Internal thermal controller with fan control
[    3.023437] [drm] probing gen 2 caps for device aaa1:bed1 = 18cc41/0
[    3.077284] [drm] radeon: dpm initialized
[    3.081503] [drm] GART: num cpu pages 262144, num gpu pages 262144
[    3.093142] [drm] probing gen 2 caps for device aaa1:bed1 = 18cc41/0
[    3.125984] [drm] PCIE GART of 1024M enabled (table at 0x0000000000277000).
[    3.133327] radeon 0001:81:00.0: WB enabled
[    3.137565] radeon 0001:81:00.0: fence driver on ring 0 use gpu addr 0x0000000040000c00 and cpu addr 0xffc01c00
[    3.147697] radeon 0001:81:00.0: fence driver on ring 1 use gpu addr 0x0000000040000c04 and cpu addr 0xffc01c04
[    3.157827] radeon 0001:81:00.0: fence driver on ring 2 use gpu addr 0x0000000040000c08 and cpu addr 0xffc01c08
[    3.167957] radeon 0001:81:00.0: fence driver on ring 3 use gpu addr 0x0000000040000c0c and cpu addr 0xffc01c0c
[    3.178078] radeon 0001:81:00.0: fence driver on ring 4 use gpu addr 0x0000000040000c10 and cpu addr 0xffc01c10
[    3.209673] radeon 0001:81:00.0: fence driver on ring 5 use gpu addr 0x0000000000075a18 and cpu addr 0xf90b5a18
[    3.219822] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[    3.226457] [drm] Driver supports precise vblank timestamp query.
[    3.232584] radeon 0001:81:00.0: radeon: MSI limited to 32-bit
[    3.238466] ppc4xx_setup_msi_irqs: fail allocating msi interrupt
[    3.244586] [drm] radeon: irq initialized.
[    4.006339] [drm:r600_ring_test] *ERROR* radeon: ring 0 test failed (scratch(0x850C)=0xCAFEDEAD)
[    4.015198] radeon 0001:81:00.0: disabling GPU acceleration
[    4.220071] [drm] Radeon Display Connectors
[    4.224651] [drm] Connector 0:
[    4.227787] [drm]   HDMI-A-1
[    4.230754] [drm]   HPD4
[    4.233328] [drm]   DDC: 0x6570 0x6570 0x6574 0x6574 0x6578 0x6578 0x657c 0x657c
[    4.240806] [drm]   Encoders:
[    4.243815] [drm]     DFP1: INTERNAL_UNIPHY2
[    4.248131] [drm] Connector 1:
[    4.251227] [drm]   DVI-I-1
[    4.254051] [drm]   HPD2
[    4.256608] [drm]   DDC: 0x6560 0x6560 0x6564 0x6564 0x6568 0x6568 0x656c 0x656c
[    4.264034] [drm]   Encoders:
[    4.267021] [drm]     DFP2: INTERNAL_UNIPHY
[    4.271223] [drm]     CRT1: INTERNAL_KLDSCP_DAC1
[    4.390562] [drm] fb mappable at 0x80478000
[    4.394789] [drm] vram apper at 0x80000000
[    4.398905] [drm] size 8294400
[    4.401978] [drm] fb depth is 24
[    4.405225] [drm]    pitch is 7680
[    4.700581] Console: switching to colour frame buffer device 240x67
[    4.779669] radeon 0001:81:00.0: fb0: radeondrmfb frame buffer device
[    4.786489] radeon 0001:81:00.0: registered panic notifier
[    4.796803] [drm] Initialized radeon 2.41.0 20080528 for 0001:81:00.0 on minor 0

[   31.191562] Unable to handle kernel paging request for data at address 0x00000008
[   31.258832] Faulting instruction address: 0xc04a51bc
[   34.049506] Oops: Kernel access of bad area, sig: 11 [#1]
[   34.055246] PREEMPT Canyonlands
[   34.058586] Modules linked in:
[   34.061830] CPU: 0 PID: 1998 Comm: Xorg Not tainted 4.0.3-Sam460ex #2
[   34.068633] task: edee4c60 ti: ede8a000 task.ti: ede8a000
[   34.074334] NIP: c04a51bc LR: c04a546c CTR: c03e5050
[   34.079578] REGS: ede8bc30 TRAP: 0300   Not tainted  (4.0.3-Sam460ex)
[   34.086381] MSR: 00029000 <CE,EE,ME>  CR: 20004422  XER: 00000000
[   34.092944] DEAR: 00000008 ESR: 00000000
GPR00: c04a5438 ede8bce0 edee4c60 eea84000 00000000 00000000 c0710000 00000000
GPR08: 00000000 00000000 eeac0400 ede8bce0 20004444 b7a55afc b80efab0 b80ee530
GPR16: 00000000 ffffffff 6f23c730 ede8be18 c03add44 eeac0578 00000001 00004000
GPR24: 00004000 c0719b98 fffffff2 00000001 eeb61200 eea84000 eea8df00 00000000
[   34.127485] NIP [c04a51bc] radeon_audio_enable+0x4/0x18
[   34.133000] LR [c04a546c] radeon_audio_detect+0xd4/0x104
[   34.138604] Call Trace:
[   34.141185] [ede8bce0] [c04a5438] radeon_audio_detect+0xa0/0x104 (unreliable)
[   34.148771] [ede8bd00] [c03e6958] radeon_dvi_detect+0x390/0x3b4
[   34.155046] [ede8bd30] [c0391cec] drm_helper_probe_single_connector_modes_merge_bits+0xf4/0x448
[   34.164253] [ede8bd70] [c03ade28] drm_mode_getconnector+0xe4/0x334
[   34.170796] [ede8be10] [c03a0be8] drm_ioctl+0x348/0x464
[   34.176343] [ede8bed0] [c00ce2e8] do_vfs_ioctl+0x52c/0x6e8
[   34.182158] [ede8bf20] [c00ce4e4] SyS_ioctl+0x40/0x68
[   34.187515] [ede8bf40] [c000ab1c] ret_from_syscall+0x0/0x3c
[   34.193417] --- interrupt: c01 at 0x6fb001dc
[   34.193417]     LR = 0x6fb00100
[   34.201216] Instruction dump:
[   34.204368] 8129012c 806a0018 2f890000 419e0018 81290004 2f890000 419e000c 7d2903a6
[   34.212674] 4e800420 38600000 4e800020 81231cd8 <81290008> 2f890000 4d9e0020 7d2903a6
[   34.376219] ---[ end trace 803e15e46b991816 ]---
[   34.380843]
  * Starting Mount filesystems on boot[ OK ]
  *




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