- Configure MPS settings for VMD root ports (Jon Derrick)

* remotes/lorenzo/pci/vmd:
  PCI/VMD: Configure MPS settings before adding devices

  - Fix mvebu prefetchable BAR regression caused by common bridge emulation
    that assumed all bridges had prefetchable windows (Thomas Petazzoni)

  - Make advk_pci_bridge_emul_ops static (Wei Yongjun)

* remotes/lorenzo/pci/misc:
  PCI: aardvark: Make symbol 'advk_pci_bridge_emul_ops' static
  PCI: pci-bridge-emul: Extend pci_bridge_emul_init() with flags
  PCI: pci-bridge-emul: Create per-bridge copy of register behavior

  - Fix mediatek MMIO size computation to enable full size of available
    MMIO space (Honghui Zhang)

  - Fix mediatek DMA window size computation to allow endpoint DMA access
    to full DRAM address range (Honghui Zhang)

* remotes/lorenzo/pci/mediatek:
  PCI: mediatek: Enlarge PCIe2AHB window size to support 4GB DRAM
  PCI: mediatek: Fix memory mapped IO range size computation

  - Remove duplicate struct hv_vp_set in favor of struct hv_vpset (Maya
    Nakamura)

  - Rework hv_irq_unmask() to use cpumask_to_vpset() instead of open-coded
    reimplementation (Maya Nakamura)

  - Align Hyper-V struct retarget_msi_interrupt arguments (Maya Nakamura)

* remotes/lorenzo/pci/hv:
  PCI: hv: Refactor hv_irq_unmask() to use cpumask_to_vpset()
  PCI: hv: Replace hv_vp_set with hv_vpset
  PCI: hv: Add __aligned(8) to struct retarget_msi_interrupt

  - Use memcpy_fromio()/memcpy_toio() instead of plain memcpy() in PCI
    endpoint framework (Wen Yang)

  - Add interface to discover supported endpoint features to replace a
    bitfield that wasn't flexible enough (Kishon Vijay Abraham I)

  - Implement the new supported-feature interface for designware-plat,
    dra7xx, rockchip, cadence (Kishon Vijay Abraham I)

  - Fix issues with 64-bit BAR in endpoints (Kishon Vijay Abraham I)

  - Add layerscape endpoint mode support (Xiaowei Bao)

* remotes/lorenzo/pci/endpoint:
  misc: pci_endpoint_test: Add the layerscape EP device support
  PCI: layerscape: Add EP mode support
  arm64: dts: Add the PCIE EP node in dts
  dt-bindings: add DT binding for the layerscape PCIe controller with EP mode
  PCI: endpoint: Remove features member in struct pci_epc
  PCI: designware-plat: Remove setting epc->features in Designware plat EP driver
  PCI: rockchip: Remove pci_epf_linkup() from Rockchip EP driver
  PCI: cadence: Remove pci_epf_linkup() from Cadence EP driver
  PCI: pci-epf-test: Use pci_epc_get_features() to get EPC features
  PCI: pci-epf-test: Do not allocate next BARs memory if current BAR is 64Bit
  PCI: pci-epf-test: Remove setting epf_bar flags in function driver
  PCI: endpoint: Fix pci_epf_alloc_space() to set correct MEM TYPE flags
  PCI: endpoint: Add helper to get first unreserved BAR
  PCI: cadence: Populate ->get_features() cdns_pcie_epc_ops
  PCI: rockchip: Populate ->get_features() dw_pcie_ep_ops
  PCI: pci-dra7xx: Populate ->get_features() dw_pcie_ep_ops
  PCI: designware-plat: Populate ->get_features() dw_pcie_ep_ops
  PCI: dwc: Add ->get_features() callback function to dw_pcie_ep_ops
  PCI: endpoint: Add new pci_epc_ops to get EPC features
  PCI: endpoint: functions: Use memcpy_fromio()/memcpy_toio()

  - Add dra72x/dra74x/dra76x SoC compatible strings (Kishon Vijay
    Abraham I)

  - Enable x2 mode support for dra72x/dra74x/dra76x SoC (Kishon Vijay
    Abraham I)

  - Configure dra7xx PHY to PCIe mode (Kishon Vijay Abraham I)

  - Simplify dwc (remove unnecessary header includes, name variables
    consistently, reduce inverted logic, etc) (Gustavo Pimentel)

  - Add i.MX8MQ support (Andrey Smirnov)

  - Add message to help debug dwc MSI-X mask bit errors (Gustavo Pimentel)

  - Work around imx7d PCIe PLL erratum (Trent Piepho)

  - Don't assert qcom reset GPIO during probe (Bjorn Andersson)

  - Skip dwc MSI init if MSIs have been disabled (Lucas Stach)

* remotes/lorenzo/pci/dwc:
  PCI: dwc: skip MSI init if MSIs have been explicitly disabled
  PCI: dwc: Remove superfluous shifting in definitions
  PCI: dwc: Make use of GENMASK/FIELD_PREP
  PCI: dwc: Make use of BIT() in constant definitions
  PCI: dwc: Share code for dw_pcie_rd/wr_other_conf()
  PCI: dwc: Make use of IS_ALIGNED()
  PCI: imx6: Add code to request/control "pcie_aux" clock for i.MX8MQ
  dt-bindings: imx6q-pcie: Add "pcie_aux" clock for imx8mq
  PCI: qcom: Don't deassert reset GPIO during probe
  PCI: imx: Add workaround for e10728, IMX7d PCIe PLL failure
  ARM: dts: imx7d: Add node for PCIe PHY
  dt-bindings: imx6q-pcie: Add description of imx7d pcie phy
  PCI: dwc: Print debug error message when MSI-X entry control mask bit is set
  PCI: imx6: Add support for i.MX8MQ
  PCI: imx6: Convert DIRECT_SPEED_CHANGE quirk code to use a flag
  PCI: imx6: Mark PHY functions as i.MX6 specific
  PCI: imx6: Introduce drvdata
  PCI: dwc: Replace bit rotation operation (1 << bit) with BIT(bit)
  PCI: dwc: Improve code readability and simplify mask/unmask operations
  PCI: dwc: Rename variable name from data to d on dw_pcie_irq_domain_free()
  PCI: dwc: Rename variable name from data to d on dw_pci_msi_set_affinity()
  PCI: dwc: Rename variable name from data to d on dw_pci_setup_msi_msg()
  PCI: dwc: Rename variable name from data to d on dw_pci_bottom_mask/unmask()
  PCI: dwc: Remove unnecessary header include (signal.h)
  PCI: dwc: Remove unnecessary header include (of_gpio.h)
  PCI: dwc: dra7xx: Invoke phy_set_mode() API to set PHY mode to PHY_MODE_PCIE
  PCI: dwc: dra7xx: Enable x2 mode support for dra74x, dra76x and dra72x
  dt-bindings: PCI: dra7xx: Add properties to enable x2 lane in dra7
  dt-bindings: PCI: dra7xx: Add SoC specific compatible strings

  - Add DT support for R-Car RZ/G2E (R8A774C0) (Fabrizio Castro)

* remotes/lorenzo/pci/dt:
  dt-bindings: PCI: rcar: Add device tree support for r8a774c0

  - Replace Douglas with Tom Joseph as Cadence PCI host/endpoint maintainer
    (Lorenzo Pieralisi)

* remotes/lorenzo/pci/cadence:
  MAINTAINERS: Update PCI Cadence maintainer entry

  - Extend altera to support Stratix 10 (Ley Foon Tan)

  - Allow building altera driver on ARM64 (Ley Foon Tan)

* remotes/lorenzo/pci/altera:
  dt-bindings: PCI: altera: Add altr,pcie-root-port-2.0
  PCI: altera: Enable driver on ARM64
  PCI: altera: Add Stratix 10 PCIe support

  - Blacklist Gigabyte X299 Root Port power management to fix Thunderbolt
    hotplug (Mika Westerberg)

  - Revert runtime PM suspend/resume callbacks that broke PME on network
    cable plug (Mika Westerberg)

  - Disable Data Link State Changed interrupts to prevent wakeup
    immediately after suspend (Mika Westerberg)

* pci/pm:
  PCI/PME: Fix possible use-after-free on remove
  PCI/PME: Fix hotplug/sysfs remove deadlock in pcie_pme_remove()
  PCI: pciehp: Disable Data Link Layer State Changed event on suspend
  Revert "PCI/PME: Implement runtime PM callbacks"
  PCI: Blacklist power management of Gigabyte X299 DESIGNARE EX PCIe ports

  - Allow portdrv to claim subtractive decode Ports so PCIe services will
    work for them (Honghui Zhang)

  - Report PCIe links that become degraded at run-time (Alexandru Gagniuc)

* pci/portdrv:
  PCI/LINK: Report degraded links via link bandwidth notification
  PCI/portdrv: Support PCIe services on subtractive decode bridges
  PCI/portdrv: Use conventional Device ID table formatting

  - Mark expected switch fall-through (Mathieu Malaterre)

  - Use of_node_name_eq() for node name comparisons (Rob Herring)

  - Add ACS and pciehp quirks for HXT SD4800 (Shunyong Yang)

  - Consolidate Rohm Vendor ID definitions (Andy Shevchenko)

  - Use u32 (not __u32) for things not exposed to userspace (Logan
    Gunthorpe)

  - Fix locking semantics of bus and slot reset interfaces (Alex
    Williamson)

  - Update PCIEPORTBUS Kconfig help text (Hou Zhiqiang)

* pci/misc:
  PCI: Update PCIEPORTBUS Kconfig help text
  PCI: Fix "try" semantics of bus and slot reset
  PCI: Clean up usage of __u32 type
  genirq/msi: Clean up usage of __u8/__u16 types
  PCI: Move Rohm Vendor ID to generic list
  PCI: pciehp: Add HXT quirk for Command Completed errata
  PCI: Add ACS quirk for HXT SD4800
  PCI: Add HXT vendor ID
  PCI: Use of_node_name_eq() for node name comparisons
  PCI: Mark expected switch fall-through

  - Reorder pciehp cached state/hardware state updates to avoid missed
    interrupts (Mika Westerberg)

  - Turn ibmphp semaphores into completions or mutexes (Arnd Bergmann)

* pci/hotplug:
  PCI: ibmphp: Turn semaphores into completions or mutexes
  PCI: pciehp: Assign ctrl->slot_ctrl before writing it to hardware

  - Probe bridge window attributes only once at enumeration-time to fix
    device accesses during rescan (Bjorn Helgaas)

  - Return BAR size (not "size -1 ") from pci_size() to simplify code (Du
    Changbin)

  - Use config header type (not class code) identify bridges more reliably
    (Honghui Zhang)

  - Work around Intel Denverton incorrect Trace Hub BAR size reporting
    (Alexander Shishkin)

* pci/enumeration:
  x86/PCI: Fixup RTIT_BAR of Intel Denverton Trace Hub
  PCI: Rely on config space header type, not class code
  PCI: Make pci_size() return real BAR size
  PCI: Probe bridge window attributes once at enumeration-time

  - Fix DPC use of uninitialized data (Dongdong Liu)

* pci/dpc:
  PCI/DPC: Fix print AER status in DPC event handling

  - Use Latency Tolerance Reporting if already enabled by platform (Bjorn
    Helgaas)

  - Save/restore LTR info for suspend/resume (Bjorn Helgaas)

* pci/aspm:
  PCI/ASPM: Save LTR Capability for suspend/resume
  PCI/ASPM: Use LTR if already enabled by platform

  - Use match_string() instead of reimplementing it (Andy Shevchenko)

  - Enable SERR# forwarding for all bridges (Bharat Kumar Gogada)

* pci/aer:
  PCI: Enable SERR# forwarding for all bridges
  PCI/AER: Use match_string() helper to simplify the code

The Virtual Channel service has been removed and Downstream Port
Containment has been added, so update the symbol description to be
consistent with the current code.

Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

The commit referenced below introduced device locking around save and
restore of state for each device during a PCI bus "try" reset, making it
decidely non-"try" and prone to deadlock in the event that a device is
already locked.  Restore __pci_reset_bus() and __pci_reset_slot() to their
advertised locking semantics by pushing the save and restore functions into
the branch where the entire tree is already locked.  Extend the helper
function names with "_locked" and update the comment to reflect this
calling requirement.

Fixes: b014e96d

 ("PCI: Protect pci_error_handlers->reset_notify() usage with device_lock()")
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Sinan Kaya <okaya@kernel.org>

A warning is generated when a PCIe device is probed with a degraded link,
but there was no similar mechanism to warn when the link becomes degraded
after probing.  The Link Bandwidth Notification provides this mechanism.

Use the Link Bandwidth Management Interrupt to detect bandwidth changes,
and rescan the bandwidth, looking for the weakest point.  This is the same
logic used in probe().

Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Lukas Wunner <lukas@wunner.de>

Add support for altr,pcie-root-port-2.0.

Signed-off-by: Ley Foon Tan <ley.foon.tan@intel.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Rob Herring <robh@kernel.org>

Enable PCIE_ALTERA on ARM64 platform.

Signed-off-by: Ley Foon Tan <ley.foon.tan@intel.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>

Add PCIe Root Port support for Stratix 10 device.

Main differences compared to the PCIe Root Port IP on Cyclone V
and Arria 10 devices:

- HIP interface to access Root Port configuration register
- TLP programming flow:
  - One REG0 register
  - Don't need to check alignment

Signed-off-by: Ley Foon Tan <ley.foon.tan@intel.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>

In remove(), ensure that the PME work cannot run after kfree() is called.
Otherwise, this could result in a use-after-free.

This issue was detected with the help of Coccinelle.

Signed-off-by: Sven Van Asbroeck <TheSven73@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Cc: Sinan Kaya <okaya@kernel.org>
Cc: Frederick Lawler <fred@fredlawl.com>
Cc: Mika Westerberg <mika.westerberg@linux.intel.com>
Cc: Keith Busch <keith.busch@intel.com>
Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Fix the following sparse warning:

drivers/pci/controller/pci-aardvark.c:469:28: warning:
 symbol 'advk_pci_bridge_emul_ops' was not declared. Should it be static?

Fixes: 8a3ebd8d

 ("PCI: aardvark: Implement emulated root PCI bridge config space")
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

Since 7c5925af (PCI: dwc: Move MSI IRQs allocation to IRQ domains
hierarchical API) the MSI init claims one of the controller IRQs as a
chained IRQ line for the MSI controller. On some designs, like the i.MX6,
this line is shared with a PCIe legacy IRQ. When the line is claimed for
the MSI domain, any device trying to use this legacy IRQs will fail to
request this IRQ line.

As MSI and legacy IRQs are already mutually exclusive on the DWC core,
as the core won't forward any legacy IRQs once any MSI has been enabled,
users wishing to use legacy IRQs already need to explictly disable MSI
support (usually via the pci=nomsi kernel commandline option). To avoid
any issues with MSI conflicting with legacy IRQs, just skip all of the
DWC MSI initalization, including the IRQ line claim, when MSI is disabled.

Fixes: 7c5925af

 ("PCI: dwc: Move MSI IRQs allocation to IRQ domains hierarchical API")
Tested-by: Tim Harvey <tharvey@gateworks.com>
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Cc: stable@vger.kernel.org

Remove the duplicate implementation of cpumask_to_vpset() and use the
shared implementation. Export hv_max_vp_index, which is required by
cpumask_to_vpset().

Signed-off-by: Maya Nakamura <m.maya.nakamura@gmail.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Tested-by: Vitaly Kuznetsov <vkuznets@redhat.com>

Remove a duplicate definition of VP set (hv_vp_set) and use the common
definition (hv_vpset) that is used in other places.

Change the order of the members in struct hv_pcibus_device so that the
declaration of retarget_msi_interrupt_params is the last member. Struct
hv_vpset, which contains a flexible array, is nested two levels deep in
struct hv_pcibus_device via retarget_msi_interrupt_params.

Add a comment that retarget_msi_interrupt_params should be the last
member of struct hv_pcibus_device.

Signed-off-by: Maya Nakamura <m.maya.nakamura@gmail.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Tested-by: Vitaly Kuznetsov <vkuznets@redhat.com>

Because Hyper-V requires that hypercall arguments be aligned on an 8
byte boundary, add __aligned(8) to struct retarget_msi_interrupt.

Link: https://lore.kernel.org/lkml/87k1hlqlby.fsf@vitty.brq.redhat.com/
Signed-off-by: Maya Nakamura <m.maya.nakamura@gmail.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>

The PCIE_AXI_WINDOW0 register defines the inbound window size for
requests coming from PCI endpoints. Requests outside of this window will
be treated as unsupported requests.

Enlarge this window size from 2^31 to 2^33 to support a 8GB address
space (which gives endpoints DMA access to full 4GB DRAM address range
- physical DRAM starts at 0x40000000).

Reported-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: Honghui Zhang <honghui.zhang@mediatek.com>
[lorenzo.pieralisi@arm.com: updated commit log]
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>

Mediatek's HW assigns a MMIO address range (typically starts from
0x20000000 to 0x2fffffff for both mt2712 and mt7622) for PCI usage.

This MMIO address space represents the address space that can
be allocated to PCI devices through Base Address Registers.

Even though the full MMIO address range is available to be allocated, it
should be enabled by the PCIE_AHB_TRANS_BASE register in the host
controller and the size that is enabled is determined by AHB2PCIE_SIZE
bits in this register.

Owing to a bug in the MMIO window size computation, current code does
not enable the full size of the available MMIO address range in the
PCI host controller; if the PCI devices BARs requested size exceeds the
size enabled through the PCIE_AHB_TRANS_BASE register the requests
targeting the disabled address address space will be blocked by the root
complex causing a system error.

Existing code has never run into a system error in production because
even half of the enabled MMIO range (128MB) is big enough for typical
devices BAR requests (4MB) but the full MMIO address range should
be enabled regardless.

Fix the MMIO window size computation by using resource_size(mem) instead
of mem->end - mem->start.

Since the MMIO window size for both MT2712 and MT7622 is 0x10000000,
this change will update the parameter passed to fls() from 0xfffffff to
0x10000000 and calculate the whole memory mapped IO range size
correctly.

Detected through coccinelle semantic patch (and related warning):

scripts/coccinelle/api/resource_size.cocci:

pcie-mediatek.c:720:13-16: WARNING: Suspicious code. resource_size is maybe missing with mem

Signed-off-by: Honghui Zhang <honghui.zhang@mediatek.com>
[lorenzo.pieralisi@arm.com: rewrote the commit log]
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>

Surrounding definitions no longer use explicit shift, so "<< 0" here
serve no purpose. Remove them. No functional change intended.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Cc: Chris Healy <cphealy@gmail.com>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Leonard Crestez <leonard.crestez@nxp.com>
Cc: "A.s. Dong" <aisheng.dong@nxp.com>
Cc: Richard Zhu <hongxing.zhu@nxp.com>
Cc: linux-imx@nxp.com
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-pci@vger.kernel.org

Convert various multi-bit fields to be defined using GENMASK/FIELD_PREP.
This way bit field boundaries are defined in a single place only, as
well as defined in a way that makes it easier to verify them against the
reference manual. No functional change intended.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Cc: Chris Healy <cphealy@gmail.com>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Leonard Crestez <leonard.crestez@nxp.com>
Cc: "A.s. Dong" <aisheng.dong@nxp.com>
Cc: Richard Zhu <hongxing.zhu@nxp.com>
Cc: linux-imx@nxp.com
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-pci@vger.kernel.org

Avoid using explicit left shifts and convert various definitions to
use BIT() instead. No functional change intended.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
[lorenzo.pieralisi@arm.com: fixed PORT_LOGIC_SPEED_CHANGE redefinition]
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Cc: Chris Healy <cphealy@gmail.com>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Leonard Crestez <leonard.crestez@nxp.com>
Cc: "A.s. Dong" <aisheng.dong@nxp.com>
Cc: Richard Zhu <hongxing.zhu@nxp.com>
Cc: linux-imx@nxp.com
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-pci@vger.kernel.org

Default implementation of pcie_rd_other_conf() and
dw_pcie_wd_other_conf() share more than 80% of their code. Move shared
code into a dedicated subroutine and convert pcie_rd_other_conf() and
dw_pcie_wd_other_conf() to use it. No functional change intended.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Cc: Chris Healy <cphealy@gmail.com>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Leonard Crestez <leonard.crestez@nxp.com>
Cc: "A.s. Dong" <aisheng.dong@nxp.com>
Cc: Richard Zhu <hongxing.zhu@nxp.com>
Cc: linux-imx@nxp.com
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-pci@vger.kernel.org

Make the intent a bit more clear as well as get rid of explicit
arithmetic by using IS_ALIGNED() to determine if "addr" is aligned to
"size". No functional change intended.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Cc: Chris Healy <cphealy@gmail.com>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Leonard Crestez <leonard.crestez@nxp.com>
Cc: "A.s. Dong" <aisheng.dong@nxp.com>
Cc: Richard Zhu <hongxing.zhu@nxp.com>
Cc: linux-imx@nxp.com
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-pci@vger.kernel.org

The PCIe IP block has an additional clock, "pcie_aux", that needs to
be controlled by the driver. Add code to support it.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Lucas Stach <l.stach@pengutronix.de>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Cc: Chris Healy <cphealy@gmail.com>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Leonard Crestez <leonard.crestez@nxp.com>
Cc: "A.s. Dong" <aisheng.dong@nxp.com>
Cc: Richard Zhu <hongxing.zhu@nxp.com>
Cc: linux-imx@nxp.com
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-pci@vger.kernel.org
Cc: Rob Herring <robh@kernel.org>
Cc: devicetree@vger.kernel.org

Dongdong reported a deadlock triggered by a hotplug event during a sysfs
"remove" operation:

  pciehp 0000:00:0c.0:pcie004: Slot(0-1): Link Up
  # echo 1 > 0000:00:0c.0/remove

  PME and hotplug share an MSI/MSI-X vector.  The sysfs "remove" side is:

    remove_store
       pci_stop_and_remove_bus_device_locked
	 pci_lock_rescan_remove
	 pci_stop_and_remove_bus_device
	   ...
	   pcie_pme_remove
	     pcie_pme_suspend
	       synchronize_irq        # wait for hotplug IRQ handler
	 pci_unlock_rescan_remove

  The hotplug side is:

    pciehp_ist
       pciehp_handle_presence_or_link_change
	 pciehp_configure_device
	   pci_lock_rescan_remove     # wait for pci_unlock_rescan_remove()

  INFO: task bash:10913 blocked for more than 120 seconds.

  # ps -ax |grep D
   PID TTY      STAT   TIME COMMAND
  10913 ttyAMA0  Ds+    0:00 -bash
  14022 ?        D      0:00 [irq/745-pciehp]

  # cat /proc/14022/stack
  __switch_to+0x94/0xd8
  pci_lock_rescan_remove+0x20/0x28
  pciehp_configure_device+0x30/0x140
  pciehp_handle_presence_or_link_change+0x324/0x458
  pciehp_ist+0x1dc/0x1e0

  # cat /proc/10913/stack
  __switch_to+0x94/0xd8
  synchronize_irq+0x8c/0xc0
  pcie_pme_suspend+0xa4/0x118
  pcie_pme_remove+0x20/0x40
  pcie_port_remove_service+0x3c/0x58
  ...
  pcie_port_device_remove+0x2c/0x48
  pcie_portdrv_remove+0x68/0x78
  pci_device_remove+0x48/0x120
  ...
  pci_stop_bus_device+0x84/0xc0
  pci_stop_and_remove_bus_device_locked+0x24/0x40
  remove_store+0xa4/0xb8
  dev_attr_store+0x44/0x60
  sysfs_kf_write+0x58/0x80

It is incorrect to call pcie_pme_suspend() from pcie_pme_remove() for two
reasons.

First, pcie_pme_suspend() calls synchronize_irq(), which will wait for the
native hotplug interrupt handler as well as for the PME one, because they
share one IRQ (as per the spec).  That may deadlock if hotplug is signaled
while pcie_pme_remove() is running and the latter calls
pci_lock_rescan_remove() before the former.

Second, if pcie_pme_suspend() figures out that wakeup needs to be enabled
for the port, it will return without disabling the interrupt as expected by
pcie_pme_remove() which was overlooked by commit c7b5a4e6 ("PCI / PM:
Fix native PME handling during system suspend/resume").

To fix that, rework pcie_pme_remove() to disable the PME interrupt, clear
its status and prevent the PME worker function from re-enabling it before
calling free_irq() on it, which should be sufficient.

Fixes: c7b5a4e6

 ("PCI / PM: Fix native PME handling during system suspend/resume")
Link: https://lore.kernel.org/linux-pci/c7697e7c-e1af-13e4-8491-0a3996e6ab5d@huawei.com
Reported-by: Dongdong Liu <liudongdong3@huawei.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
[bhelgaas: add URL and deadlock details from Dongdong]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

Add a binding for an extra clock required on i.MX8MQ.

Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Lucas Stach <l.stach@pengutronix.de>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Fabio Estevam <fabio.estevam@nxp.com>
Cc: Chris Healy <cphealy@gmail.com>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: Leonard Crestez <leonard.crestez@nxp.com>
Cc: "A.s. Dong" <aisheng.dong@nxp.com>
Cc: Richard Zhu <hongxing.zhu@nxp.com>
Cc: linux-imx@nxp.com
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Cc: linux-pci@vger.kernel.org
Cc: Rob Herring <robh@kernel.org>
Cc: devicetree@vger.kernel.org

Acquiring the reset GPIO low means that reset is being deasserted, this
is followed almost immediately with qcom_pcie_host_init() asserting it,
initializing it and then finally deasserting it again, for the link to
come up.

Some PCIe devices requires a minimum time between the initial deassert
and subsequent reset cycles. In a platform that boots with the reset
GPIO asserted this requirement is being violated by this deassert/assert
pulse.

Acquire the reset GPIO high to prevent this situation by matching the
state to the subsequent asserted state.

Fixes: 82a82383

 ("PCI: qcom: Add Qualcomm PCIe controller driver")
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
[lorenzo.pieralisi@arm.com: updated commit log]
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Stanimir Varbanov <svarbanov@mm-sol.com>
Cc: stable@vger.kernel.org