BUG: *ERROR* No EDID read

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On Mon, Jul 2, 2018 at 5:39 PM, Daniel Andersson <engywook at gmail.com> wrote:
> Sure, bisecting gets me 6e65fb862064663ad3a08f964af1e8f3f2abf688 .
>
> In drivers/gpu/drm/amd/display/dc/bios/bios_parser2.c,
> get_firmware_info_v3_1() works but get_firmware_info_v3_2() does not
> do the right thing for my Vega.
>
> Could I break my GPU if I were to set some bad/wrong frequency there?

vega10 should not hit that new path at all.  Have you edited your
vbios?  Can you send us a copy?  To get a copy of the vbios:

Without the driver loaded:
(as root)
(use lspci to get the bus id)
cd /sys/bus/pci/devices/<pci bus id>
echo 1 > rom
cat rom > /tmp/vbios.rom
echo 0 > rom

If the driver is loaded:
(as root)
cat /sys/kernel/debug/dri/0/amdgpu_vbios > /tmp/vbios.rom

Alex

>
> lspci:
> 43:00.0 VGA compatible controller: Advanced Micro Devices, Inc.
> [AMD/ATI] Vega 10 XT [Radeon RX Vega 64] (rev c1) (prog-if 00 [VGA
> controller])
>   Subsystem: Sapphire Technology Limited Vega 10 XT [Radeon RX Vega
> 64]
>   Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
> Stepping- SERR- FastB2B- DisINTx+
>   Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort-
> <TAbort- <MAbort- >SERR- <PERR- INTx-
>   Latency: 0, Cache Line Size: 64 bytes
>   Interrupt: pin A routed to IRQ 85
>   Region 0: Memory at d0000000 (64-bit, prefetchable) [size=256M]
>   Region 2: Memory at e0000000 (64-bit, prefetchable) [size=2M]
>   Region 4: I/O ports at f000 [size=256]
>   Region 5: Memory at ed400000 (32-bit, non-prefetchable) [size=512K]
>   Expansion ROM at ed480000 [disabled] [size=128K]
>   Capabilities: [48] Vendor Specific Information: Len=08 <?>
>   Capabilities: [50] Power Management version 3
>     Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA
> PME(D0-,D1+,D2+,D3hot+,D3cold+)
>     Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME-
>   Capabilities: [64] Express (v2) Legacy Endpoint, MSI 00
>     DevCap: MaxPayload 256 bytes, PhantFunc 0, Latency L0s <4us, L1
> unlimited
>       ExtTag+ AttnBtn- AttnInd- PwrInd- RBE+ FLReset-
>     DevCtl: Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
>       RlxdOrd+ ExtTag+ PhantFunc- AuxPwr- NoSnoop+
>       MaxPayload 256 bytes, MaxReadReq 512 bytes
>     DevSta: CorrErr+ UncorrErr- FatalErr- UnsuppReq+ AuxPwr-
> TransPend-
>     LnkCap: Port #0, Speed 8GT/s, Width x16, ASPM L0s L1, Exit Latency
> L0s <64ns, L1 <1us
>       ClockPM- Surprise- LLActRep- BwNot- ASPMOptComp+
>     LnkCtl: ASPM L0s L1 Enabled; RCB 64 bytes Disabled- CommClk+
>       ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
>     LnkSta: Speed 8GT/s, Width x16, TrErr- Train- SlotClk+ DLActive-
> BWMgmt- ABWMgmt-
>     DevCap2: Completion Timeout: Not Supported, TimeoutDis-, LTR+,
> OBFF Not Supported
>        AtomicOpsCap: 32bit- 64bit- 128bitCAS-
>     DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-, LTR-, OBFF
> Disabled
>        AtomicOpsCtl: ReqEn-
>     LnkCtl2: Target Link Speed: 8GT/s, EnterCompliance- SpeedDis-
>        Transmit Margin: Normal Operating Range,
> EnterModifiedCompliance- ComplianceSOS-
>        Compliance De-emphasis: -6dB
>     LnkSta2: Current De-emphasis Level: -3.5dB, EqualizationComplete+,
> EqualizationPhase1+
>        EqualizationPhase2+, EqualizationPhase3+,
> LinkEqualizationRequest-
>   Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+
>     Address: 00000000fee00000  Data: 0000
>   Capabilities: [100 v1] Vendor Specific Information: ID=0001 Rev=1
> Len=010 <?>
>   Capabilities: [150 v2] Advanced Error Reporting
>     UESta:  DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF-
> MalfTLP- ECRC- UnsupReq- ACSViol-
>     UEMsk:  DLP- SDES- TLP- FCP- CmpltTO- CmpltAbrt- UnxCmplt- RxOF-
> MalfTLP- ECRC- UnsupReq- ACSViol-
>     UESvrt: DLP+ SDES+ TLP- FCP+ CmpltTO- CmpltAbrt- UnxCmplt- RxOF+
> MalfTLP+ ECRC- UnsupReq- ACSViol-
>     CESta:  RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+
>     CEMsk:  RxErr- BadTLP- BadDLLP- Rollover- Timeout- NonFatalErr+
>     AERCap: First Error Pointer: 00, ECRCGenCap+ ECRCGenEn-
> ECRCChkCap+ ECRCChkEn-
>       MultHdrRecCap- MultHdrRecEn- TLPPfxPres- HdrLogCap-
>     HeaderLog: 00000000 00000000 00000000 00000000
>   Capabilities: [200 v1] #15
>   Capabilities: [270 v1] #19
>   Capabilities: [2a0 v1] Access Control Services
>     ACSCap: SrcValid- TransBlk- ReqRedir- CmpltRedir- UpstreamFwd-
> EgressCtrl- DirectTrans-
>     ACSCtl: SrcValid- TransBlk- ReqRedir- CmpltRedir- UpstreamFwd-
> EgressCtrl- DirectTrans-
>   Capabilities: [2b0 v1] Address Translation Service (ATS)
>     ATSCap: Invalidate Queue Depth: 00
>     ATSCtl: Enable+, Smallest Translation Unit: 00
>   Capabilities: [2c0 v1] Page Request Interface (PRI)
>     PRICtl: Enable- Reset-
>     PRISta: RF- UPRGI- Stopped+
>     Page Request Capacity: 00000020, Page Request Allocation: 00000000
>   Capabilities: [2d0 v1] Process Address Space ID (PASID)
>     PASIDCap: Exec+ Priv+, Max PASID Width: 10
>     PASIDCtl: Enable- Exec- Priv-
>   Capabilities: [320 v1] Latency Tolerance Reporting
>     Max snoop latency: 0ns
>     Max no snoop latency: 0ns
>   Kernel driver in use: amdgpu
>   Kernel modules: amdgpu
>
> // Daniel
>
> On 2 July 2018 at 21:29, Alex Deucher <alexdeucher at gmail.com> wrote:
>> On Mon, Jul 2, 2018 at 3:21 PM, Daniel Andersson <engywook at gmail.com> wrote:
>>> I get:
>>> [drm:dc_link_detect [amdgpu]] *ERROR* No EDID read.
>>> on boot. This started happening on 4.17 and is still an issue on 4.18-rc2.
>>>
>>> I have a Vega64 connected on Display Port to a monitor(1440p). The monitor
>>> doesn't have any additional ports so I can't test HDMI.
>>>
>>> xrandr:
>>> Screen 0: minimum 320 x 200, current 1024 x 768, maximum 16384 x 16384
>>> DisplayPort-0 connected 1024x768+0+0 (normal left inverted right x axis y
>>> axis) 0mm x 0mm
>>>    1024x768      60.00*
>>>    800x600       60.32    56.25
>>>    848x480       60.00
>>>    640x480       59.94
>>> DisplayPort-1 disconnected (normal left inverted right x axis y axis)
>>> HDMI-A-0 disconnected (normal left inverted right x axis y axis)
>>> HDMI-A-1 disconnected (normal left inverted right x axis y axis)
>>>
>>> The 1440p resolution worked on 4.16.
>>
>> Can you use git to bisect?
>>
>> Alex


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