BUG: *ERROR* No EDID read

[Daniel Andersson]

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?

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