> -----Original Message----- > From: Roberto Fichera [mailto:kernel@xxxxxxxxxxxxx] > Sent: Thursday, March 03, 2016 5:30 PM > To: Richard Zhu; Bjorn Helgaas > Cc: linux-pci@xxxxxxxxxxxxxxx; Richard Zhu; Lucas Stach > Subject: Re: iMX6q PCIe phy link never came up on kernel v4.4.x > > On 03/03/2016 10:15 AM, Richard Zhu wrote: > > Hi Richard, > > >> -----Original Message----- > >> From: Bjorn Helgaas [mailto:helgaas@xxxxxxxxxx] > >> Sent: Thursday, March 03, 2016 3:57 AM > >> To: Roberto Fichera > >> Cc: linux-pci@xxxxxxxxxxxxxxx; Richard Zhu; Lucas Stach > >> Subject: Re: iMX6q PCIe phy link never came up on kernel v4.4.x > >> > >> [+cc Richard, Lucas] > >> > >> On Wed, Mar 02, 2016 at 06:13:11PM +0100, Roberto Fichera wrote: > >>> On 03/01/2016 07:47 PM, Roberto Fichera wrote: > >>> > >>> Sorry guy if I push a little bit about this, I've added some > >>> debugging code > >> regarding my issue: > >>> [ 0.557268] imx6q-pcie 1ffc000.pcie: phy link never came up > >>> [ 0.557290] imx6q-pcie 1ffc000.pcie: LTSSM current state: 0x3 > >> (S_POLL_COMPLIANCE) > >>> [ 0.557304] imx6q-pcie 1ffc000.pcie: PIPE transmit K indication: 1 > >>> [ 0.557318] imx6q-pcie 1ffc000.pcie: PIPE Transmit data: 0x4abc > >>> [ 0.557332] imx6q-pcie 1ffc000.pcie: Receiver is receiving logical idle: no > >>> [ 0.557345] imx6q-pcie 1ffc000.pcie: Second symbol is also idle (16-bit > PHY > >> interface only): no > >>> [ 0.557360] imx6q-pcie 1ffc000.pcie: Currently receiving k237 (PAD) in > >> place of link number: no > >>> [ 0.557372] imx6q-pcie 1ffc000.pcie: Currently receiving k237 (PAD) in > >> place of lane number: no > >>> [ 0.557385] imx6q-pcie 1ffc000.pcie: Link control bits advertised by link > >> partner: 0xa > >>> [ 0.557398] imx6q-pcie 1ffc000.pcie: Receiver detected lane reversal: no > >>> [ 0.557410] imx6q-pcie 1ffc000.pcie: TS2 training sequence received: no > >>> [ 0.557422] imx6q-pcie 1ffc000.pcie: TS1 training sequence received: no > >>> [ 0.557434] imx6q-pcie 1ffc000.pcie: Receiver reports skip reception: no > >>> [ 0.557446] imx6q-pcie 1ffc000.pcie: LTSSM reports PHY link up: no > >>> [ 0.557460] imx6q-pcie 1ffc000.pcie: A skip ordered set has been > >> transmitted: no > >>> [ 0.557474] imx6q-pcie 1ffc000.pcie: Link number advertised/confirmed > by > >> link partner: 68 > >>> [ 0.557487] imx6q-pcie 1ffc000.pcie: Application request to initiate > training > >> reset: no > >>> [ 0.557500] imx6q-pcie 1ffc000.pcie: PIPE transmit compliance request: > no > >>> [ 0.557512] imx6q-pcie 1ffc000.pcie: PIPE transmit electrical idle request: > >> no > >>> [ 0.557524] imx6q-pcie 1ffc000.pcie: PIPE receiver detect/loopback > request: > >> no > >>> [ 0.557536] imx6q-pcie 1ffc000.pcie: LTSSM-negotiated link reset: yes > >>> [ 0.557547] imx6q-pcie 1ffc000.pcie: LTSSM testing for polarity reversal: > no > >>> [ 0.557559] imx6q-pcie 1ffc000.pcie: LTSSM performing link training: no > >>> [ 0.557572] imx6q-pcie 1ffc000.pcie: LTSSM in DISABLE state; link > >> inoperable: no > >>> [ 0.557583] imx6q-pcie 1ffc000.pcie: Scrambling disabled for the link: no > >>> [ 0.558156] imx6q-pcie 1ffc000.pcie: PCI host bridge to bus 0000:00 > >>> [ 0.558179] pci_bus 0000:00: root bus resource [bus 00-ff] > >>> [ 0.558197] pci_bus 0000:00: root bus resource [??? 0x01f00000- > 0x01f7ffff > >> flags 0x0] > >>> [ 0.558212] pci_bus 0000:00: root bus resource [io 0x0000-0xffff] > >>> [ 0.558226] pci_bus 0000:00: root bus resource [mem 0x01000000- > >> 0x01efffff] > >>> [ 0.558346] pci 0000:00:00.0: [16c3:abcd] type 01 class 0x060400 > >>> [ 0.558468] pci 0000:00:00.0: reg 0x10: [mem 0x00000000-0x000fffff] > >>> [ 0.558510] pci 0000:00:00.0: reg 0x38: [mem 0x00000000-0x0000ffff > pref] > >>> [ 0.558708] pci 0000:00:00.0: supports D1 > >>> [ 0.558727] pci 0000:00:00.0: PME# supported from D0 D1 D3hot D3cold > >>> [ 0.559495] PCI: bus0: Fast back to back transfers disabled > >>> [ 0.559834] PCI: bus1: Fast back to back transfers enabled > >>> [ 0.559997] pci 0000:00:00.0: BAR 0: assigned [mem 0x01000000- > 0x010fffff] > >>> [ 0.560025] pci 0000:00:00.0: BAR 6: assigned [mem 0x01100000- > 0x0110ffff > >> pref] > >>> [ 0.560047] pci 0000:00:00.0: PCI bridge to [bus 01] > >>> [ 0.560812] pcieport 0000:00:00.0: Signaling PME through PCIe PME > >> interrupt > >>> [ 0.560837] pcie_pme 0000:00:00.0:pcie01: service driver pcie_pme > loaded > >>> > >>> Any idea what's going on? > >>> > >>> Thanks in advance, > >>> Roberto Fichera. > >>> > >>>> Hi There, > >>>> > >>>> Working on a custom iMX6q board I'm getting a PCIe phy link never > >>>> came up, even if uboot seems detecting everything ok. My DTS is > >>>> enabling PCIe with > >>>> > >>>> &pcie { > >>>> pinctrl-names = "default"; > >>>> pinctrl-0 = <&pinctrl_pcie_reset>; > >>>> reset-gpio = <&gpio7 12 0>; > >>>> status = "okay"; > >>>> }; > >>>> > >>>> The PCIe is connected to a PCIe-to-PCI TI XIO2001. The XIO2001 > >>>> power is controlled by GPIO_9 and the corresponding fixed regulator > >>>> is set as > >>>> > >>>> reg_pcie: regulator@4 { > >>>> compatible = "regulator-fixed"; > >>>> reg = <4>; > >>>> pinctrl-names = "default"; > >>>> pinctrl-0 = <&pinctrl_pcie_reg>; > >>>> regulator-name = "MPCIE_3V3"; > >>>> regulator-min-microvolt = <3300000>; > >>>> regulator-max-microvolt = <3300000>; > >>>> gpio = <&gpio1 9 0>; > >>>> regulator-always-on; > >>>> enable-active-high; > >>>> }; > >>>> > >>>> so I'd like to know if there is any other special setup to do in > >>>> order to get it > >> to work on a v4.4.x kernel. > >>>> Or anyway how to debug it. > >>>> > >>>> Any suggestion? > >>>> > > [Zhu hongxing] It seems that the link down is caused by the different > initialization procedure. > > Can you take a try by the previouse kernel version? > > Or, you can dump and compare the register values just before the > LTSSM_ENABLE is asserted between Linux and uboot. > > Which register do you need to dump? > [Zhu hongxing] The registers configured during the initialization. Regarding to the current situation at your side, the pcie link is up in uboot, but is down in kernel. So, you can compare the dump of the register configured during the pcie initialization between uboot and kernel. > >>>> Thanks in advance, > >>>> Roberto Fichera. > >>>> > >>>> U-Boot 2014.04-imx_v2014.04_3.14.38_6qp_beta+g6e9282c (Feb 15 2016 > >>>> - > >>>> 10:02:31) > >>>> > >>>> CPU: Freescale i.MX6Q rev1.5 at 792 MHz > >>>> CPU: Temperature 35 C, calibration data: 0x5664d569 > >>>> Reset cause: POR > >>>> Board: Janas iMX6Q (ID:e315c064140749d4) > >>>> I2C: ready > >>>> DRAM: 2 GiB > >>>> MMC: FSL_SDHC: 0, FSL_SDHC: 1 > >>>> *** Warning - bad CRC, using default environment > >>>> > >>>> 00:01.0 - 16c3:abcd - Bridge device > >>>> 01:00.0 - 104c:8240 - Bridge device > >>>> 02:04.0 - 1397:08b4 - Network controller > >>>> In: serial > >>>> Out: serial > >>>> Err: serial > >>>> Found PFUZE100! deviceid=10,revid=21 mmc1(part 0) is current device > >>>> Net: FEC [PRIME] > >>>> Warning: failed to set MAC address > >>>> > >>>> Normal Boot > >>>> .... > >>>> .... > >>>> [ 0.236141] PCI host bridge /soc/pcie@0x01000000 ranges: > >>>> [ 0.236162] No bus range found for /soc/pcie@0x01000000, using [bus > >> 00-ff] > >>>> [ 0.236213] err 0x01f00000..0x01f7ffff -> 0x01f00000 > >>>> [ 0.236250] IO 0x01f80000..0x01f8ffff -> 0x00000000 > >>>> [ 0.236330] MEM 0x01000000..0x01efffff -> 0x01000000 > >>>> -->>> [ 0.546690] imx6q-pcie 1ffc000.pcie: phy link never came up > >>>> [ 0.547263] imx6q-pcie 1ffc000.pcie: PCI host bridge to bus 0000:00 > >>>> [ 0.547287] pci_bus 0000:00: root bus resource [bus 00-ff] > >>>> [ 0.547304] pci_bus 0000:00: root bus resource [??? 0x01f00000- > >> 0x01f7ffff flags 0x0] > >>>> [ 0.547321] pci_bus 0000:00: root bus resource [io 0x0000-0xffff] > >>>> [ 0.547335] pci_bus 0000:00: root bus resource [mem 0x01000000- > >> 0x01efffff] > >>>> [ 0.548608] PCI: bus0: Fast back to back transfers disabled > >>>> [ 0.548950] PCI: bus1: Fast back to back transfers enabled > >>>> [ 0.549107] pci 0000:00:00.0: BAR 0: assigned [mem 0x01000000- > >> 0x010fffff] > >>>> [ 0.549137] pci 0000:00:00.0: BAR 6: assigned [mem 0x01100000- > >> 0x0110ffff pref] > >>>> [ 0.549159] pci 0000:00:00.0: PCI bridge to [bus 01] > >>>> [ 0.549945] pcieport 0000:00:00.0: Signaling PME through PCIe PME > >> interrupt > >>>> ... > >>>> > >>>> -- > >>>> 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 > >>>> > >>> -- > >>> 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 > > -- > > 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 > > -- 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
