Merge tag 'pci-v6.6-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci

Pull PCI updates from Bjorn Helgaas:
 "Enumeration:
   - Add locking to read/modify/write PCIe Capability Register accessors
     for Link Control and Root Control
   - Use pci_dev_id() when possible instead of manually composing ID
     from dev->bus->number and dev->devfn

  Resource management:
   - Move prototypes for __weak sysfs resource files to linux/pci.h to
     fix 'no previous prototype' warnings
   - Make more I/O port accesses depend on HAS_IOPORT
   - Use devm_platform_get_and_ioremap_resource() instead of open-coding
     platform_get_resource() followed by devm_ioremap_resource()

  Power management:
   - Ensure devices are powered up while accessing VPD
   - If device is powered-up, keep it that way while polling for PME
   - Only read PCI_PM_CTRL register when available, to avoid reading the
     wrong register and corrupting dev->current_state

  Virtualization:
   - Avoid Secondary Bus Reset on NVIDIA T4 GPUs

  Error handling:
   - Remove unused pci_disable_pcie_error_reporting()
   - Unexport pci_enable_pcie_error_reporting(), used only by aer.c
   - Unexport pcie_port_bus_type, used only by PCI core

  VGA:
   - Simplify and clean up typos in VGA arbiter

  Apple PCIe controller driver:
   - Initialize pcie->nvecs (number of available MSIs) before use

  Broadcom iProc PCIe controller driver:
   - Use of_property_read_bool() instead of low-level accessors for
     boolean properties

  Broadcom STB PCIe controller driver:
   - Assert PERST# when probing BCM2711 because some bootloaders don't
     do it

  Freescale i.MX6 PCIe controller driver:
   - Add .host_deinit() callback so we can clean up things like
     regulators on probe failure or driver unload

  Freescale Layerscape PCIe controller driver:
   - Add support for link-down notification so the endpoint driver can
     process LINK_DOWN events
   - Add suspend/resume support, including manual
     PME_Turn_off/PME_TO_Ack handshake
   - Save Link Capabilities during probe so they can be restored when
     handling a link-up event, since the controller loses the Link Width
     and Link Speed values during reset

  Intel VMD host bridge driver:
   - Fix disable of bridge windows during domain reset; previously we
     cleared the base/limit registers, which actually left the windows
     enabled

  Marvell MVEBU PCIe controller driver:
   - Remove unused busn member

  Microchip PolarFlare PCIe controller driver:
   - Fix interrupt bit definitions so the SEC and DED interrupt handlers
     work correctly
   - Make driver buildable as a module
   - Read FPGA MSI configuration parameters from hardware instead of
     hard-coding them

  Microsoft Hyper-V host bridge driver:
   - To avoid a NULL pointer dereference, skip MSI restore after
     hibernate if MSI/MSI-X hasn't been enabled

  NVIDIA Tegra194 PCIe controller driver:
   - Revert 'PCI: tegra194: Enable support for 256 Byte payload' because
     Linux doesn't know how to reduce MPS from to 256 to 128 bytes for
     endpoints below a switch (because other devices below the switch
     might already be operating), which leads to 'Malformed TLP' errors

  Qualcomm PCIe controller driver:
   - Add DT and driver support for interconnect bandwidth voting for
     'pcie-mem' and 'cpu-pcie' interconnects
   - Fix broken SDX65 'compatible' DT property
   - Configure controller so MHI bus master clock will be switched off
     while in ASPM L1.x states
   - Use alignment restriction from EPF core in EPF MHI driver
   - Add Endpoint eDMA support
   - Add MHI eDMA support
   - Add Snapdragon SM8450 support to the EPF MHI driversupport
   - Add MHI eDMA support
   - Add Snapdragon SM8450 support to the EPF MHI driversupport
   - Add MHI eDMA support
   - Add Snapdragon SM8450 support to the EPF MHI driversupport
   - Add MHI eDMA support
   - Add Snapdragon SM8450 support to the EPF MHI driver
   - Use iATU for EPF MHI transfers smaller than 4K to avoid eDMA setup
     latency
   - Add sa8775p DT binding and driver support

  Rockchip PCIe controller driver:
   - Use 64-bit mask on MSI 64-bit PCI address to avoid zeroing out the
     upper 32 bits

  SiFive FU740 PCIe controller driver:
   - Set the supported number of MSI vectors so we can use all available
     MSI interrupts

  Synopsys DesignWare PCIe controller driver:
   - Add generic dwc suspend/resume APIs (dw_pcie_suspend_noirq() and
     dw_pcie_resume_noirq()) to be called by controller driver
     suspend/resume ops, and a controller callback to send PME_Turn_Off

  MicroSemi Switchtec management driver:
   - Add support for PCIe Gen5 devices

  Miscellaneous:
   - Reorder and compress to reduce size of struct pci_dev
   - Fix race in DOE destroy_work_on_stack()
   - Add stubs to avoid casts between incompatible function types
   - Explicitly include correct DT includes to untangle headers"

* tag 'pci-v6.6-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci: (96 commits)
  PCI: qcom-ep: Add ICC bandwidth voting support
  dt-bindings: PCI: qcom: ep: Add interconnects path
  PCI: qcom-ep: Treat unknown IRQ events as an error
  dt-bindings: PCI: qcom: Fix SDX65 compatible
  PCI: endpoint: Add kernel-doc for pci_epc_mem_init() API
  PCI: epf-mhi: Use iATU for small transfers
  PCI: epf-mhi: Add support for SM8450
  PCI: epf-mhi: Add eDMA support
  PCI: qcom-ep: Add eDMA support
  PCI: epf-mhi: Make use of the alignment restriction from EPF core
  PCI/PM: Only read PCI_PM_CTRL register when available
  PCI: qcom: Add support for sa8775p SoC
  dt-bindings: PCI: qcom: Add sa8775p compatible
  PCI: qcom-ep: Pass alignment restriction to the EPF core
  PCI: Simplify pcie_capability_clear_and_set_word() control flow
  PCI: Tidy config space save/restore messages
  PCI: Fix code formatting inconsistencies
  PCI: Fix typos in docs and comments
  PCI: Fix pci_bus_resetable(), pci_slot_resetable() name typos
  PCI: Simplify pci_dev_driver()
  ...

Documentation/PCI/pci-error-recovery.rst

@@ -17,7 +17,7 @@ chipsets are able to deal with these errors; these include PCI-E chipsets,
 and the PCI-host bridges found on IBM Power4, Power5 and Power6-based
 pSeries boxes. A typical action taken is to disconnect the affected device,
 halting all I/O to it.  The goal of a disconnection is to avoid system
-corruption; for example, to halt system memory corruption due to DMA's
+corruption; for example, to halt system memory corruption due to DMAs
 to "wild" addresses. Typically, a reconnection mechanism is also
 offered, so that the affected PCI device(s) are reset and put back
 into working condition. The reset phase requires coordination
@@ -178,9 +178,9 @@ is STEP 6 (Permanent Failure).
    complex and not worth implementing.
 
    The current powerpc implementation doesn't much care if the device
-   attempts I/O at this point, or not.  I/O's will fail, returning
+   attempts I/O at this point, or not.  I/Os will fail, returning
    a value of 0xff on read, and writes will be dropped. If more than
-   EEH_MAX_FAILS I/O's are attempted to a frozen adapter, EEH
+   EEH_MAX_FAILS I/Os are attempted to a frozen adapter, EEH
    assumes that the device driver has gone into an infinite loop
    and prints an error to syslog.  A reboot is then required to
    get the device working again.
@@ -204,7 +204,7 @@ instead will have gone directly to STEP 3 (Link Reset) or STEP 4 (Slot Reset)
 .. note::
 
    The following is proposed; no platform implements this yet:
-   Proposal: All I/O's should be done _synchronously_ from within
+   Proposal: All I/Os should be done _synchronously_ from within
    this callback, errors triggered by them will be returned via
    the normal pci_check_whatever() API, no new error_detected()
    callback will be issued due to an error happening here. However,
@@ -258,7 +258,7 @@ Powerpc platforms implement two levels of slot reset:
 soft reset(default) and fundamental(optional) reset.
 
 Powerpc soft reset consists of asserting the adapter #RST line and then
-restoring the PCI BAR's and PCI configuration header to a state
+restoring the PCI BARs and PCI configuration header to a state
 that is equivalent to what it would be after a fresh system
 power-on followed by power-on BIOS/system firmware initialization.
 Soft reset is also known as hot-reset.
@@ -362,7 +362,7 @@ permanent failure in some way.  If the device is hotplug-capable,
 the operator will probably want to remove and replace the device.
 Note, however, not all failures are truly "permanent". Some are
 caused by over-heating, some by a poorly seated card. Many
-PCI error events are caused by software bugs, e.g. DMA's to
+PCI error events are caused by software bugs, e.g. DMAs to
 wild addresses or bogus split transactions due to programming
 errors. See the discussion in Documentation/powerpc/eeh-pci-error-recovery.rst
 for additional detail on real-life experience of the causes of

Documentation/PCI/pciebus-howto.rst

@@ -213,8 +213,12 @@ PCI Config Registers
 --------------------
 
 Each service driver runs its PCI config operations on its own
-capability structure except the PCI Express capability structure, in
-which Root Control register and Device Control register are shared
-between PME and AER. This patch assumes that all service drivers
-will be well behaved and not overwrite other service driver's
-configuration settings.
+capability structure except the PCI Express capability structure,
+that is shared between many drivers including the service drivers.
+RMW Capability accessors (pcie_capability_clear_and_set_word(),
+pcie_capability_set_word(), and pcie_capability_clear_word()) protect
+a selected set of PCI Express Capability Registers (Link Control
+Register and Root Control Register). Any change to those registers
+should be performed using RMW accessors to avoid problems due to
+concurrent updates. For the up-to-date list of protected registers,
+see pcie_capability_clear_and_set_word().

Documentation/devicetree/bindings/pci/qcom,pcie-ep.yaml

@@ -11,10 +11,13 @@ maintainers:
 
 properties:
   compatible:
-    enum:
-      - qcom,sdx55-pcie-ep
-      - qcom,sdx65-pcie-ep
-      - qcom,sm8450-pcie-ep
+    oneOf:
+      - enum:
+          - qcom,sdx55-pcie-ep
+          - qcom,sm8450-pcie-ep
+      - items:
+          - const: qcom,sdx65-pcie-ep
+          - const: qcom,sdx55-pcie-ep
 
   reg:
     items:
@@ -71,6 +74,14 @@ properties:
     description: GPIO used as WAKE# output signal
     maxItems: 1
 
+  interconnects:
+    maxItems: 2
+
+  interconnect-names:
+    items:
+      - const: pcie-mem
+      - const: cpu-pcie
+
   resets:
     maxItems: 1
 
@@ -98,6 +109,8 @@ required:
   - interrupts
   - interrupt-names
   - reset-gpios
+  - interconnects
+  - interconnect-names
   - resets
   - reset-names
   - power-domains
@@ -110,7 +123,6 @@ allOf:
           contains:
             enum:
               - qcom,sdx55-pcie-ep
-              - qcom,sdx65-pcie-ep
     then:
       properties:
         clocks:
@@ -167,7 +179,9 @@ examples:
   - |
     #include <dt-bindings/clock/qcom,gcc-sdx55.h>
     #include <dt-bindings/gpio/gpio.h>
+    #include <dt-bindings/interconnect/qcom,sdx55.h>
     #include <dt-bindings/interrupt-controller/arm-gic.h>
+
     pcie_ep: pcie-ep@1c00000 {
         compatible = "qcom,sdx55-pcie-ep";
         reg = <0x01c00000 0x3000>,
@@ -194,6 +208,9 @@ examples:
         interrupts = <GIC_SPI 140 IRQ_TYPE_LEVEL_HIGH>,
                      <GIC_SPI 145 IRQ_TYPE_LEVEL_HIGH>;
         interrupt-names = "global", "doorbell";
+        interconnects = <&system_noc MASTER_PCIE &mc_virt SLAVE_EBI_CH0>,
+                        <&mem_noc MASTER_AMPSS_M0 &system_noc SLAVE_PCIE_0>;
+        interconnect-names = "pcie-mem", "cpu-pcie";
         reset-gpios = <&tlmm 57 GPIO_ACTIVE_LOW>;
         wake-gpios = <&tlmm 53 GPIO_ACTIVE_LOW>;
         resets = <&gcc GCC_PCIE_BCR>;

Documentation/devicetree/bindings/pci/qcom,pcie.yaml

@@ -29,6 +29,7 @@ properties:
           - qcom,pcie-msm8996
           - qcom,pcie-qcs404
           - qcom,pcie-sa8540p
+          - qcom,pcie-sa8775p
           - qcom,pcie-sc7280
           - qcom,pcie-sc8180x
           - qcom,pcie-sc8280xp
@@ -211,6 +212,7 @@ allOf:
         compatible:
           contains:
             enum:
+              - qcom,pcie-sa8775p
               - qcom,pcie-sc7280
               - qcom,pcie-sc8180x
               - qcom,pcie-sc8280xp
@@ -743,12 +745,37 @@ allOf:
           items:
             - const: pci # PCIe core reset
 
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - qcom,pcie-sa8775p
+    then:
+      properties:
+        clocks:
+          minItems: 5
+          maxItems: 5
+        clock-names:
+          items:
+            - const: aux # Auxiliary clock
+            - const: cfg # Configuration clock
+            - const: bus_master # Master AXI clock
+            - const: bus_slave # Slave AXI clock
+            - const: slave_q2a # Slave Q2A clock
+        resets:
+          maxItems: 1
+        reset-names:
+          items:
+            - const: pci # PCIe core reset
+
   - if:
       properties:
         compatible:
           contains:
             enum:
               - qcom,pcie-sa8540p
+              - qcom,pcie-sa8775p
               - qcom,pcie-sc8280xp
     then:
       required:
@@ -790,6 +817,7 @@ allOf:
           contains:
             enum:
               - qcom,pcie-msm8996
+              - qcom,pcie-sa8775p
               - qcom,pcie-sc7280
               - qcom,pcie-sc8180x
               - qcom,pcie-sdm845

arch/alpha/include/asm/pci.h

@@ -88,7 +88,4 @@ extern void pci_adjust_legacy_attr(struct pci_bus *bus,
 				   enum pci_mmap_state mmap_type);
 #define HAVE_PCI_LEGACY	1
 
-extern int pci_create_resource_files(struct pci_dev *dev);
-extern void pci_remove_resource_files(struct pci_dev *dev);
-
 #endif /* __ALPHA_PCI_H */

arch/x86/pci/irq.c

@@ -136,14 +136,14 @@ static inline struct irq_routing_table *pirq_convert_irt_table(u8 *addr,
 	if (ir->signature != IRT_SIGNATURE || !ir->used || ir->size < ir->used)
 		return NULL;
 
-	size = sizeof(*ir) + ir->used * sizeof(ir->slots[0]);
+	size = struct_size(ir, slots, ir->used);
 	if (size > limit - addr)
 		return NULL;
 
 	DBG(KERN_DEBUG "PCI: $IRT Interrupt Routing Table found at 0x%lx\n",
 	    __pa(ir));
 
-	size = sizeof(*rt) + ir->used * sizeof(rt->slots[0]);
+	size = struct_size(rt, slots, ir->used);
 	rt = kzalloc(size, GFP_KERNEL);
 	if (!rt)
 		return NULL;

drivers/gpu/drm/amd/amdgpu/cik.c

@@ -1574,17 +1574,8 @@ static void cik_pcie_gen3_enable(struct amdgpu_device *adev)
 			u16 bridge_cfg2, gpu_cfg2;
 			u32 max_lw, current_lw, tmp;
 
-			pcie_capability_read_word(root, PCI_EXP_LNKCTL,
-						  &bridge_cfg);
-			pcie_capability_read_word(adev->pdev, PCI_EXP_LNKCTL,
-						  &gpu_cfg);
-
-			tmp16 = bridge_cfg | PCI_EXP_LNKCTL_HAWD;
-			pcie_capability_write_word(root, PCI_EXP_LNKCTL, tmp16);
-
-			tmp16 = gpu_cfg | PCI_EXP_LNKCTL_HAWD;
-			pcie_capability_write_word(adev->pdev, PCI_EXP_LNKCTL,
-						   tmp16);
+			pcie_capability_set_word(root, PCI_EXP_LNKCTL, PCI_EXP_LNKCTL_HAWD);
+			pcie_capability_set_word(adev->pdev, PCI_EXP_LNKCTL, PCI_EXP_LNKCTL_HAWD);
 
 			tmp = RREG32_PCIE(ixPCIE_LC_STATUS1);
 			max_lw = (tmp & PCIE_LC_STATUS1__LC_DETECTED_LINK_WIDTH_MASK) >>
@@ -1637,21 +1628,14 @@ static void cik_pcie_gen3_enable(struct amdgpu_device *adev)
 				msleep(100);
 
 				/* linkctl */
-				pcie_capability_read_word(root, PCI_EXP_LNKCTL,
-							  &tmp16);
-				tmp16 &= ~PCI_EXP_LNKCTL_HAWD;
-				tmp16 |= (bridge_cfg & PCI_EXP_LNKCTL_HAWD);
-				pcie_capability_write_word(root, PCI_EXP_LNKCTL,
-							   tmp16);
-
-				pcie_capability_read_word(adev->pdev,
-							  PCI_EXP_LNKCTL,
-							  &tmp16);
-				tmp16 &= ~PCI_EXP_LNKCTL_HAWD;
-				tmp16 |= (gpu_cfg & PCI_EXP_LNKCTL_HAWD);
-				pcie_capability_write_word(adev->pdev,
-							   PCI_EXP_LNKCTL,
-							   tmp16);
+				pcie_capability_clear_and_set_word(root, PCI_EXP_LNKCTL,
+								   PCI_EXP_LNKCTL_HAWD,
+								   bridge_cfg &
+								   PCI_EXP_LNKCTL_HAWD);
+				pcie_capability_clear_and_set_word(adev->pdev, PCI_EXP_LNKCTL,
+								   PCI_EXP_LNKCTL_HAWD,
+								   gpu_cfg &
+								   PCI_EXP_LNKCTL_HAWD);
 
 				/* linkctl2 */
 				pcie_capability_read_word(root, PCI_EXP_LNKCTL2,

drivers/gpu/drm/amd/amdgpu/si.c

@@ -2276,17 +2276,8 @@ static void si_pcie_gen3_enable(struct amdgpu_device *adev)
 			u16 bridge_cfg2, gpu_cfg2;
 			u32 max_lw, current_lw, tmp;
 
-			pcie_capability_read_word(root, PCI_EXP_LNKCTL,
-						  &bridge_cfg);
-			pcie_capability_read_word(adev->pdev, PCI_EXP_LNKCTL,
-						  &gpu_cfg);
-
-			tmp16 = bridge_cfg | PCI_EXP_LNKCTL_HAWD;
-			pcie_capability_write_word(root, PCI_EXP_LNKCTL, tmp16);
-
-			tmp16 = gpu_cfg | PCI_EXP_LNKCTL_HAWD;
-			pcie_capability_write_word(adev->pdev, PCI_EXP_LNKCTL,
-						   tmp16);
+			pcie_capability_set_word(root, PCI_EXP_LNKCTL, PCI_EXP_LNKCTL_HAWD);
+			pcie_capability_set_word(adev->pdev, PCI_EXP_LNKCTL, PCI_EXP_LNKCTL_HAWD);
 
 			tmp = RREG32_PCIE(PCIE_LC_STATUS1);
 			max_lw = (tmp & LC_DETECTED_LINK_WIDTH_MASK) >> LC_DETECTED_LINK_WIDTH_SHIFT;
@@ -2331,21 +2322,14 @@ static void si_pcie_gen3_enable(struct amdgpu_device *adev)
 
 				mdelay(100);
 
-				pcie_capability_read_word(root, PCI_EXP_LNKCTL,
-							  &tmp16);
-				tmp16 &= ~PCI_EXP_LNKCTL_HAWD;
-				tmp16 |= (bridge_cfg & PCI_EXP_LNKCTL_HAWD);
-				pcie_capability_write_word(root, PCI_EXP_LNKCTL,
-							   tmp16);
-
-				pcie_capability_read_word(adev->pdev,
-							  PCI_EXP_LNKCTL,
-							  &tmp16);
-				tmp16 &= ~PCI_EXP_LNKCTL_HAWD;
-				tmp16 |= (gpu_cfg & PCI_EXP_LNKCTL_HAWD);
-				pcie_capability_write_word(adev->pdev,
-							   PCI_EXP_LNKCTL,
-							   tmp16);
+				pcie_capability_clear_and_set_word(root, PCI_EXP_LNKCTL,
+								   PCI_EXP_LNKCTL_HAWD,
+								   bridge_cfg &
+								   PCI_EXP_LNKCTL_HAWD);
+				pcie_capability_clear_and_set_word(adev->pdev, PCI_EXP_LNKCTL,
+								   PCI_EXP_LNKCTL_HAWD,
+								   gpu_cfg &
+								   PCI_EXP_LNKCTL_HAWD);
 
 				pcie_capability_read_word(root, PCI_EXP_LNKCTL2,
 							  &tmp16);

drivers/gpu/drm/radeon/cik.c

@@ -9534,17 +9534,8 @@ static void cik_pcie_gen3_enable(struct radeon_device *rdev)
 			u16 bridge_cfg2, gpu_cfg2;
 			u32 max_lw, current_lw, tmp;
 
-			pcie_capability_read_word(root, PCI_EXP_LNKCTL,
-						  &bridge_cfg);
-			pcie_capability_read_word(rdev->pdev, PCI_EXP_LNKCTL,
-						  &gpu_cfg);
-
-			tmp16 = bridge_cfg | PCI_EXP_LNKCTL_HAWD;
-			pcie_capability_write_word(root, PCI_EXP_LNKCTL, tmp16);
-
-			tmp16 = gpu_cfg | PCI_EXP_LNKCTL_HAWD;
-			pcie_capability_write_word(rdev->pdev, PCI_EXP_LNKCTL,
-						   tmp16);
+			pcie_capability_set_word(root, PCI_EXP_LNKCTL, PCI_EXP_LNKCTL_HAWD);
+			pcie_capability_set_word(rdev->pdev, PCI_EXP_LNKCTL, PCI_EXP_LNKCTL_HAWD);
 
 			tmp = RREG32_PCIE_PORT(PCIE_LC_STATUS1);
 			max_lw = (tmp & LC_DETECTED_LINK_WIDTH_MASK) >> LC_DETECTED_LINK_WIDTH_SHIFT;
@@ -9591,21 +9582,14 @@ static void cik_pcie_gen3_enable(struct radeon_device *rdev)
 				msleep(100);
 
 				/* linkctl */
-				pcie_capability_read_word(root, PCI_EXP_LNKCTL,
-							  &tmp16);
-				tmp16 &= ~PCI_EXP_LNKCTL_HAWD;
-				tmp16 |= (bridge_cfg & PCI_EXP_LNKCTL_HAWD);
-				pcie_capability_write_word(root, PCI_EXP_LNKCTL,
-							   tmp16);
-
-				pcie_capability_read_word(rdev->pdev,
-							  PCI_EXP_LNKCTL,
-							  &tmp16);
-				tmp16 &= ~PCI_EXP_LNKCTL_HAWD;
-				tmp16 |= (gpu_cfg & PCI_EXP_LNKCTL_HAWD);
-				pcie_capability_write_word(rdev->pdev,
-							   PCI_EXP_LNKCTL,
-							   tmp16);
+				pcie_capability_clear_and_set_word(root, PCI_EXP_LNKCTL,
+								   PCI_EXP_LNKCTL_HAWD,
+								   bridge_cfg &
+								   PCI_EXP_LNKCTL_HAWD);
+				pcie_capability_clear_and_set_word(rdev->pdev, PCI_EXP_LNKCTL,
+								   PCI_EXP_LNKCTL_HAWD,
+								   gpu_cfg &
+								   PCI_EXP_LNKCTL_HAWD);
 
 				/* linkctl2 */
 				pcie_capability_read_word(root, PCI_EXP_LNKCTL2,

drivers/gpu/drm/radeon/si.c

@@ -7131,17 +7131,8 @@ static void si_pcie_gen3_enable(struct radeon_device *rdev)
 			u16 bridge_cfg2, gpu_cfg2;
 			u32 max_lw, current_lw, tmp;
 
-			pcie_capability_read_word(root, PCI_EXP_LNKCTL,
-						  &bridge_cfg);
-			pcie_capability_read_word(rdev->pdev, PCI_EXP_LNKCTL,
-						  &gpu_cfg);
-
-			tmp16 = bridge_cfg | PCI_EXP_LNKCTL_HAWD;
-			pcie_capability_write_word(root, PCI_EXP_LNKCTL, tmp16);
-
-			tmp16 = gpu_cfg | PCI_EXP_LNKCTL_HAWD;
-			pcie_capability_write_word(rdev->pdev, PCI_EXP_LNKCTL,
-						   tmp16);
+			pcie_capability_set_word(root, PCI_EXP_LNKCTL, PCI_EXP_LNKCTL_HAWD);
+			pcie_capability_set_word(rdev->pdev, PCI_EXP_LNKCTL, PCI_EXP_LNKCTL_HAWD);
 
 			tmp = RREG32_PCIE(PCIE_LC_STATUS1);
 			max_lw = (tmp & LC_DETECTED_LINK_WIDTH_MASK) >> LC_DETECTED_LINK_WIDTH_SHIFT;
@@ -7188,22 +7179,14 @@ static void si_pcie_gen3_enable(struct radeon_device *rdev)
 				msleep(100);
 
 				/* linkctl */
-				pcie_capability_read_word(root, PCI_EXP_LNKCTL,
-							  &tmp16);
-				tmp16 &= ~PCI_EXP_LNKCTL_HAWD;
-				tmp16 |= (bridge_cfg & PCI_EXP_LNKCTL_HAWD);
-				pcie_capability_write_word(root,
-							   PCI_EXP_LNKCTL,
-							   tmp16);
-
-				pcie_capability_read_word(rdev->pdev,
-							  PCI_EXP_LNKCTL,
-							  &tmp16);
-				tmp16 &= ~PCI_EXP_LNKCTL_HAWD;
-				tmp16 |= (gpu_cfg & PCI_EXP_LNKCTL_HAWD);
-				pcie_capability_write_word(rdev->pdev,
-							   PCI_EXP_LNKCTL,
-							   tmp16);
+				pcie_capability_clear_and_set_word(root, PCI_EXP_LNKCTL,
+								   PCI_EXP_LNKCTL_HAWD,
+								   bridge_cfg &
+								   PCI_EXP_LNKCTL_HAWD);
+				pcie_capability_clear_and_set_word(rdev->pdev, PCI_EXP_LNKCTL,
+								   PCI_EXP_LNKCTL_HAWD,
+								   gpu_cfg &
+								   PCI_EXP_LNKCTL_HAWD);
 
 				/* linkctl2 */
 				pcie_capability_read_word(root, PCI_EXP_LNKCTL2,

drivers/net/ethernet/mellanox/mlx5/core/fw_reset.c

@@ -338,7 +338,7 @@ static int mlx5_check_dev_ids(struct mlx5_core_dev *dev, u16 dev_id)
 	list_for_each_entry(sdev, &bridge_bus->devices, bus_list) {
 		err = pci_read_config_word(sdev, PCI_DEVICE_ID, &sdev_id);
 		if (err)
-			return err;
+			return pcibios_err_to_errno(err);
 		if (sdev_id != dev_id) {
 			mlx5_core_warn(dev, "unrecognized dev_id (0x%x)\n", sdev_id);
 			return -EPERM;
@@ -398,7 +398,7 @@ static int mlx5_pci_link_toggle(struct mlx5_core_dev *dev)
 
 	err = pci_read_config_word(dev->pdev, PCI_DEVICE_ID, &dev_id);
 	if (err)
-		return err;
+		return pcibios_err_to_errno(err);
 	err = mlx5_check_dev_ids(dev, dev_id);
 	if (err)
 		return err;
@@ -411,18 +411,13 @@ static int mlx5_pci_link_toggle(struct mlx5_core_dev *dev)
 		pci_cfg_access_lock(sdev);
 	}
 	/* PCI link toggle */
-	err = pci_read_config_word(bridge, cap + PCI_EXP_LNKCTL, &reg16);
+	err = pcie_capability_set_word(bridge, PCI_EXP_LNKCTL, PCI_EXP_LNKCTL_LD);
 	if (err)
-		return err;
-	reg16 |= PCI_EXP_LNKCTL_LD;
-	err = pci_write_config_word(bridge, cap + PCI_EXP_LNKCTL, reg16);
-	if (err)
-		return err;
+		return pcibios_err_to_errno(err);
 	msleep(500);
-	reg16 &= ~PCI_EXP_LNKCTL_LD;
-	err = pci_write_config_word(bridge, cap + PCI_EXP_LNKCTL, reg16);
+	err = pcie_capability_clear_word(bridge, PCI_EXP_LNKCTL, PCI_EXP_LNKCTL_LD);
 	if (err)
-		return err;
+		return pcibios_err_to_errno(err);
 
 	/* Check link */
 	if (!bridge->link_active_reporting) {
@@ -435,7 +430,7 @@ static int mlx5_pci_link_toggle(struct mlx5_core_dev *dev)
 	do {
 		err = pci_read_config_word(bridge, cap + PCI_EXP_LNKSTA, &reg16);
 		if (err)
-			return err;
+			return pcibios_err_to_errno(err);
 		if (reg16 & PCI_EXP_LNKSTA_DLLLA)
 			break;
 		msleep(20);
@@ -453,7 +448,7 @@ static int mlx5_pci_link_toggle(struct mlx5_core_dev *dev)
 	do {
 		err = pci_read_config_word(dev->pdev, PCI_DEVICE_ID, &reg16);
 		if (err)
-			return err;
+			return pcibios_err_to_errno(err);
 		if (reg16 == dev_id)
 			break;
 		msleep(20);

drivers/net/wireless/ath/ath10k/pci.c

@@ -1963,8 +1963,9 @@ static int ath10k_pci_hif_start(struct ath10k *ar)
 	ath10k_pci_irq_enable(ar);
 	ath10k_pci_rx_post(ar);
 
-	pcie_capability_write_word(ar_pci->pdev, PCI_EXP_LNKCTL,
-				   ar_pci->link_ctl);
+	pcie_capability_clear_and_set_word(ar_pci->pdev, PCI_EXP_LNKCTL,
+					   PCI_EXP_LNKCTL_ASPMC,
+					   ar_pci->link_ctl & PCI_EXP_LNKCTL_ASPMC);
 
 	return 0;
 }
@@ -2821,8 +2822,8 @@ static int ath10k_pci_hif_power_up(struct ath10k *ar,
 
 	pcie_capability_read_word(ar_pci->pdev, PCI_EXP_LNKCTL,
 				  &ar_pci->link_ctl);
-	pcie_capability_write_word(ar_pci->pdev, PCI_EXP_LNKCTL,
-				   ar_pci->link_ctl & ~PCI_EXP_LNKCTL_ASPMC);
+	pcie_capability_clear_word(ar_pci->pdev, PCI_EXP_LNKCTL,
+				   PCI_EXP_LNKCTL_ASPMC);
 
 	/*
 	 * Bring the target up cleanly.

drivers/net/wireless/ath/ath11k/pci.c

@@ -582,8 +582,8 @@ static void ath11k_pci_aspm_disable(struct ath11k_pci *ab_pci)
 		   u16_get_bits(ab_pci->link_ctl, PCI_EXP_LNKCTL_ASPM_L1));
 
 	/* disable L0s and L1 */
-	pcie_capability_write_word(ab_pci->pdev, PCI_EXP_LNKCTL,
-				   ab_pci->link_ctl & ~PCI_EXP_LNKCTL_ASPMC);
+	pcie_capability_clear_word(ab_pci->pdev, PCI_EXP_LNKCTL,
+				   PCI_EXP_LNKCTL_ASPMC);
 
 	set_bit(ATH11K_PCI_ASPM_RESTORE, &ab_pci->flags);
 }
@@ -591,8 +591,10 @@ static void ath11k_pci_aspm_disable(struct ath11k_pci *ab_pci)
 static void ath11k_pci_aspm_restore(struct ath11k_pci *ab_pci)
 {
 	if (test_and_clear_bit(ATH11K_PCI_ASPM_RESTORE, &ab_pci->flags))
-		pcie_capability_write_word(ab_pci->pdev, PCI_EXP_LNKCTL,
-					   ab_pci->link_ctl);
+		pcie_capability_clear_and_set_word(ab_pci->pdev, PCI_EXP_LNKCTL,
+						   PCI_EXP_LNKCTL_ASPMC,
+						   ab_pci->link_ctl &
+						   PCI_EXP_LNKCTL_ASPMC);
 }
 
 static int ath11k_pci_power_up(struct ath11k_base *ab)

drivers/net/wireless/ath/ath12k/pci.c

@@ -794,8 +794,8 @@ static void ath12k_pci_aspm_disable(struct ath12k_pci *ab_pci)
 		   u16_get_bits(ab_pci->link_ctl, PCI_EXP_LNKCTL_ASPM_L1));
 
 	/* disable L0s and L1 */
-	pcie_capability_write_word(ab_pci->pdev, PCI_EXP_LNKCTL,
-				   ab_pci->link_ctl & ~PCI_EXP_LNKCTL_ASPMC);
+	pcie_capability_clear_word(ab_pci->pdev, PCI_EXP_LNKCTL,
+				   PCI_EXP_LNKCTL_ASPMC);
 
 	set_bit(ATH12K_PCI_ASPM_RESTORE, &ab_pci->flags);
 }
@@ -803,8 +803,10 @@ static void ath12k_pci_aspm_disable(struct ath12k_pci *ab_pci)
 static void ath12k_pci_aspm_restore(struct ath12k_pci *ab_pci)
 {
 	if (test_and_clear_bit(ATH12K_PCI_ASPM_RESTORE, &ab_pci->flags))
-		pcie_capability_write_word(ab_pci->pdev, PCI_EXP_LNKCTL,
-					   ab_pci->link_ctl);
+		pcie_capability_clear_and_set_word(ab_pci->pdev, PCI_EXP_LNKCTL,
+						   PCI_EXP_LNKCTL_ASPMC,
+						   ab_pci->link_ctl &
+						   PCI_EXP_LNKCTL_ASPMC);
 }
 
 static void ath12k_pci_kill_tasklets(struct ath12k_base *ab)

drivers/pci/access.c

@@ -497,22 +497,35 @@ int pcie_capability_write_dword(struct pci_dev *dev, int pos, u32 val)
 }
 EXPORT_SYMBOL(pcie_capability_write_dword);
 
-int pcie_capability_clear_and_set_word(struct pci_dev *dev, int pos,
-				       u16 clear, u16 set)
+int pcie_capability_clear_and_set_word_unlocked(struct pci_dev *dev, int pos,
+						u16 clear, u16 set)
 {
 	int ret;
 	u16 val;
 
 	ret = pcie_capability_read_word(dev, pos, &val);
-	if (!ret) {
-		val &= ~clear;
-		val |= set;
-		ret = pcie_capability_write_word(dev, pos, val);
-	}
+	if (ret)
+		return ret;
+
+	val &= ~clear;
+	val |= set;
+	return pcie_capability_write_word(dev, pos, val);
+}
+EXPORT_SYMBOL(pcie_capability_clear_and_set_word_unlocked);
+
+int pcie_capability_clear_and_set_word_locked(struct pci_dev *dev, int pos,
+					      u16 clear, u16 set)
+{
+	unsigned long flags;
+	int ret;
+
+	spin_lock_irqsave(&dev->pcie_cap_lock, flags);
+	ret = pcie_capability_clear_and_set_word_unlocked(dev, pos, clear, set);
+	spin_unlock_irqrestore(&dev->pcie_cap_lock, flags);
 
 	return ret;
 }
-EXPORT_SYMBOL(pcie_capability_clear_and_set_word);
+EXPORT_SYMBOL(pcie_capability_clear_and_set_word_locked);
 
 int pcie_capability_clear_and_set_dword(struct pci_dev *dev, int pos,
 					u32 clear, u32 set)
@@ -521,13 +534,12 @@ int pcie_capability_clear_and_set_dword(struct pci_dev *dev, int pos,
 	u32 val;
 
 	ret = pcie_capability_read_dword(dev, pos, &val);
-	if (!ret) {
-		val &= ~clear;
-		val |= set;
-		ret = pcie_capability_write_dword(dev, pos, val);
-	}
+	if (ret)
+		return ret;
 
-	return ret;
+	val &= ~clear;
+	val |= set;
+	return pcie_capability_write_dword(dev, pos, val);
 }
 EXPORT_SYMBOL(pcie_capability_clear_and_set_dword);
 

drivers/pci/controller/Kconfig

@@ -216,7 +216,7 @@ config PCIE_MT7621
 	  This selects a driver for the MediaTek MT7621 PCIe Controller.
 
 config PCIE_MICROCHIP_HOST
-	bool "Microchip AXI PCIe controller"
+	tristate "Microchip AXI PCIe controller"
 	depends on PCI_MSI && OF
 	select PCI_HOST_COMMON
 	help

drivers/pci/controller/cadence/pci-j721e.c

@@ -14,8 +14,8 @@
 #include <linux/irqdomain.h>
 #include <linux/mfd/syscon.h>
 #include <linux/of.h>
-#include <linux/of_device.h>
 #include <linux/pci.h>
+#include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
 #include <linux/regmap.h>
 

drivers/pci/controller/cadence/pcie-cadence-plat.c

@@ -6,11 +6,10 @@
  * Author: Tom Joseph <tjoseph@cadence.com>
  */
 #include <linux/kernel.h>
-#include <linux/of_address.h>
+#include <linux/of.h>
 #include <linux/of_pci.h>
 #include <linux/platform_device.h>
 #include <linux/pm_runtime.h>
-#include <linux/of_device.h>
 #include "pcie-cadence.h"
 
 #define CDNS_PLAT_CPU_TO_BUS_ADDR	0x0FFFFFFF

drivers/pci/controller/cadence/pcie-cadence.c

@@ -4,6 +4,7 @@
 // Author: Cyrille Pitchen <cyrille.pitchen@free-electrons.com>
 
 #include <linux/kernel.h>
+#include <linux/of.h>
 
 #include "pcie-cadence.h"
 

drivers/pci/controller/cadence/pcie-cadence.h

@@ -32,7 +32,7 @@
 #define  CDNS_PCIE_LM_ID_SUBSYS(sub) \
 	(((sub) << CDNS_PCIE_LM_ID_SUBSYS_SHIFT) & CDNS_PCIE_LM_ID_SUBSYS_MASK)
 
-/* Root Port Requestor ID Register */
+/* Root Port Requester ID Register */
 #define CDNS_PCIE_LM_RP_RID	(CDNS_PCIE_LM_BASE + 0x0228)
 #define  CDNS_PCIE_LM_RP_RID_MASK	GENMASK(15, 0)
 #define  CDNS_PCIE_LM_RP_RID_SHIFT	0