yhlu.kernel@xxxxxxxxx wrote on 2012/07/11 03:33:05: > > On Tue, Jul 10, 2012 at 6:07 PM, Joakim Tjernlund > <joakim.tjernlund@xxxxxxxxxxxx> wrote: > > yhlu.kernel@xxxxxxxxx wrote on 2012/07/11 00:09:00: > > >> No. Can you compile lspci util as static and run it ? > > > > That wasn't so hard so here: > > > > root@P2020RDB ~ # ./lspci -vvxxx > > 00:00.0 Class 0604: Device 1957:0079 (rev 21) > > 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: 32 bytes > > Region 0: Memory at <ignored> (32-bit, non-prefetchable) > > Bus: primary=00, secondary=01, subordinate=01, sec-latency=0 > > I/O behind bridge: 00000000-00000fff > > Memory behind bridge: 80000000-9fffffff > > Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- <SERR- <PERR- > > BridgeCtl: Parity- SERR- NoISA- VGA- MAbort- >Reset- FastB2B- > > PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn- > > Capabilities: [44] Power Management version 2 > > Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0+,D1+,D2+,D3hot+,D3cold+) > > Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME- > > Capabilities: [4c] Express (v1) Root Port (Slot-), MSI 00 > > DevCap: MaxPayload 256 bytes, PhantFunc 0, Latency L0s <64ns, L1 <1us > > ExtTag- RBE- FLReset- > > DevCtl: Report errors: Correctable+ Non-Fatal+ Fatal+ Unsupported+ > > RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop+ > > MaxPayload 128 bytes, MaxReadReq 512 bytes > > DevSta: CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr- TransPend- > > LnkCap: Port #0, Speed 2.5GT/s, Width x4, ASPM L0s, Latency L0 <2us, L1 unlimited > > ClockPM- Surprise- LLActRep- BwNot- > > LnkCtl: ASPM Disabled; RCB 128 bytes Disabled- Retrain- CommClk- > > ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt- > > LnkSta: Speed 2.5GT/s, Width x2, TrErr- Train- SlotClk- DLActive- BWMgmt- ABWMgmt- > > RootCtl: ErrCorrectable- ErrNon-Fatal- ErrFatal- PMEIntEna- CRSVisible- > > RootCap: CRSVisible- > > RootSta: PME ReqID 0000, PMEStatus- PMEPending- > > There is no slot cap etc, so pciehp will not be loaded. > the power of you child device can not be turned off/on. > > Not sure if can use link off/on make the clock effective. > > You can turn off and on the pcie link like following: > > 1. remove the child device > echo 1 > /sys/..../0000:01:00.0/remove > 2. disable link > echo 1 > /sys/..../0000:00.00.0/pcie_link_disable > 3. enable link > echo 1 > /sys/..../0000:00.00.0/pcie_link_disable > 4. rescan the pci bus. > echo 1 > /sys/..../0000:00:00.0/rescan_bridge > > please check link disable patch at > git://git.kernel.org/pub/scm/linux/kernel/git/yinghai/linux-yinghai.git > for-pci-pcie-link > > | Subject: [PATCH] PCI: Add link_disable in /sysfs for pcie device > | > | Found PCIe cards from one vendor, will not respond to scan from bridge, > | if we change bus number setting in bridge device. > | > | Have to do link disable/enable on the pcie root port. > | > | So try to expose link disable bit of pcie link control register. We can use > | echo 1 > /sys/..../link_disable > | echo 0 > /sys/..../link_disable > | to bring the pcie device back to respond to scan. Sorry for the delay, got pulled into some high prio stuff. Anyhow, I have backported your patch to 3.4 as we cannot upgrade easily and I cannot make it work. I do # > echo 1 > /sys/devices/pci0000:00/0000:00:00.0/pcie_link_disable # > echo 0 > /sys/devices/pci0000:00/0000:00:00.0/pcie_link_disable # > echo 1 > /sys/devices/pci0000:00/0000:00:00.0/rescan # > lspci 00:00.0 Class 0604: Device 1957:0079 (rev 21) #> dmesg pcieport 0000:00:00.0: pcie_link_disable_set: lnk_ctrl = 18 pcieport 0000:00:00.0: pcie_link_disable_set: lnk_ctrl = 8 find /sys -name pcie_link_disable find /sys -name remove find /sys -name rescan shows /sys/devices/pci0000:00/0000:00:00.0/pcie_link_disable /sys/devices/pci0000:00/0000:00:00.0/remove /sys/bus/pci/rescan /sys/devices/pci0000:00/0000:00:00.0/rescan /sys/devices/pci0000:00/0000:00:00.0/pci_bus/0000:01/rescan /sys/devices/pci0000:00/pci_bus/0000:00/rescan so something is missing, but what? Jocke -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
