linux-kernel - Boot stops with ehci-pci, kernel 4.3.0

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Message-ID: <5653929E.5000607@gmail.com>
Date:	Mon, 23 Nov 2015 23:26:38 +0100
From:	KARBOWSKI Piotr <piotr.karbowski@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: Boot stops with ehci-pci, kernel 4.3.0

Hello,

I am facing an strange issue. I am unable to boot a Dell PowerEdge R210 
if ehci-pci module is built into the kernel. The _ marker just blinks, 
after few minutes nothing has changed. The last messages it does display 
that I can get thru iDRAC is:

     ehci_hcd: USB 2.0 'Enhanced' Host Controller
     ehci-pci: EHCI PCI platform driver
     ehci-pci 0000:00:1a.0: EHCI Host Controller
     ehci-pci 0000:00:1a.0: new USB bus registred, assigned bust number 1
     ehci-pci 0000:00:1a.0: debug port 2
     ehci-pci 0000:00:1a.0: irq 22, io mem 0xdf0fa0

if I disable the USB support, the kernel does boots just fine. Booting 
Ubuntu 14.04's kernel 3.13.0-24-generic does not seems to suffer from 
this very problem.

The lspci -vvv for ehci-pci (from ubuntu 14.04 rescue image):

00:1a.0 USB controller: Intel Corporation 5 Series/3400 Series Chipset 
USB2 Enhanced Host Controller (rev 05) (prog-if 20 [EHCI])
         Subsystem: Dell Device 02a5
         Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- 
ParErr- Stepping- SERR+ FastB2B- DisINTx-
         Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium 
 >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
         Latency: 0
         Interrupt: pin A routed to IRQ 22
         Region 0: Memory at df0fa000 (32-bit, non-prefetchable) [size=1K]
         Capabilities: [50] Power Management version 2
                 Flags: PMEClk- DSI- D1- D2- AuxCurrent=375mA 
PME(D0+,D1-,D2-,D3hot+,D3cold+)
                 Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
         Capabilities: [58] Debug port: BAR=1 offset=00a0
         Capabilities: [98] PCI Advanced Features
                 AFCap: TP+ FLR+
                 AFCtrl: FLR-
                 AFStatus: TP-
         Kernel driver in use: ehci-pci

For the test purpose I've created a bare-minimal kernel with `make 
allnoconfig`. Not even filesystem has been included, and it still fails 
the same way.

I'd appreciate any help on resolving this very issue.

-- Piotr.
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