Pull tty/serial fixes from Greg KH:
 "Here are some small TTY and Serial driver fixes that missed the
  6.9-final merge window, but have been in my tree for weeks (my fault,
  travel caused me to miss this)

  These fixes include:

   - more n_gsm fixes for reported problems

   - 8520_mtk driver fix

   - 8250_bcm7271 driver fix

   - sc16is7xx driver fix

  All of these have been in linux-next for weeks without any reported
  problems"

* tag 'tty-6.10-rc1-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty:
  serial: sc16is7xx: fix bug in sc16is7xx_set_baud() when using prescaler
  serial: 8250_bcm7271: use default_mux_rate if possible
  serial: 8520_mtk: Set RTS on shutdown for Rx in-band wakeup
  tty: n_gsm: fix missing receive state reset after mode switch
  tty: n_gsm: fix possible out-of-bounds in gsm0_receive()

Pull tty / serial updates from Greg KH:
 "Here is the big set of tty/serial driver changes for 6.10-rc1.
  Included in here are:

   - Usual good set of api cleanups and evolution by Jiri Slaby to make
     the serial interfaces move out of the 1990's by using kfifos
     instead of hand-rolling their own logic.

   - 8250_exar driver updates

   - max3100 driver updates

   - sc16is7xx driver updates

   - exar driver updates

   - sh-sci driver updates

   - tty ldisc api addition to help refuse bindings

   - other smaller serial driver updates

  All of these have been in linux-next for a while with no reported
  issues"

* tag 'tty-6.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/tty: (113 commits)
  serial: Clear UPF_DEAD before calling tty_port_register_device_attr_serdev()
  serial: imx: Raise TX trigger level to 8
  serial: 8250_pnp: Simplify "line" related code
  serial: sh-sci: simplify locking when re-issuing RXDMA fails
  serial: sh-sci: let timeout timer only run when DMA is scheduled
  serial: sh-sci: describe locking requirements for invalidating RXDMA
  serial: sh-sci: protect invalidating RXDMA on shutdown
  tty: add the option to have a tty reject a new ldisc
  serial: core: Call device_set_awake_path() for console port
  dt-bindings: serial: brcm,bcm2835-aux-uart: convert to dtschema
  tty: serial: uartps: Add support for uartps controller reset
  arm64: zynqmp: Add resets property for UART nodes
  dt-bindings: serial: cdns,uart: Add optional reset property
  serial: 8250_pnp: Switch to DEFINE_SIMPLE_DEV_PM_OPS()
  serial: 8250_exar: Keep the includes sorted
  serial: 8250_exar: Make type of bit the same in exar_ee_*_bit()
  serial: 8250_exar: Use BIT() in exar_ee_read()
  serial: 8250_exar: Switch to use dev_err_probe()
  serial: 8250_exar: Return directly from switch-cases
  serial: 8250_exar: Decrease indentation level
  ...

Pull pci updates from Bjorn Helgaas:
 "Enumeration:

   - Skip E820 checks for MCFG ECAM regions for new (2016+) machines,
     since there's no requirement to describe them in E820 and some
     platforms require ECAM to work (Bjorn Helgaas)

   - Rename PCI_IRQ_LEGACY to PCI_IRQ_INTX to be more specific (Damien
     Le Moal)

   - Remove last user and pci_enable_device_io() (Heiner Kallweit)

   - Wait for Link Training==0 to avoid possible race (Ilpo Järvinen)

   - Skip waiting for devices that have been disconnected while
     suspended (Ilpo Järvinen)

   - Clear Secondary Status errors after enumeration since Master Aborts
     and Unsupported Request errors are an expected part of enumeration
     (Vidya Sagar)

  MSI:

   - Remove unused IMS (Interrupt Message Store) support (Bjorn Helgaas)

  Error handling:

   - Mask Genesys GL975x SD host controller Replay Timer Timeout
     correctable errors caused by a hardware defect; the errors cause
     interrupts that prevent system suspend (Kai-Heng Feng)

   - Fix EDR-related _DSM support, which previously evaluated revision 5
     but assumed revision 6 behavior (Kuppuswamy Sathyanarayanan)

  ASPM:

   - Simplify link state definitions and mask calculation (Ilpo
     Järvinen)

  Power management:

   - Avoid D3cold for HP Pavilion 17 PC/1972 PCIe Ports, where BIOS
     apparently doesn't know how to put them back in D0 (Mario
     Limonciello)

  CXL:

   - Support resetting CXL devices; special handling required because
     CXL Ports mask Secondary Bus Reset by default (Dave Jiang)

  DOE:

   - Support DOE Discovery Version 2 (Alexey Kardashevskiy)

  Endpoint framework:

   - Set endpoint BAR to be 64-bit if the driver says that's all the
     device supports, in addition to doing so if the size is >2GB
     (Niklas Cassel)

   - Simplify endpoint BAR allocation and setting interfaces (Niklas
     Cassel)

  Cadence PCIe controller driver:

   - Drop DT binding redundant msi-parent and pci-bus.yaml (Krzysztof
     Kozlowski)

  Cadence PCIe endpoint driver:

   - Configure endpoint BARs to be 64-bit based on the BAR type, not the
     BAR value (Niklas Cassel)

  Freescale Layerscape PCIe controller driver:

   - Convert DT binding to YAML (Frank Li)

  MediaTek MT7621 PCIe controller driver:

   - Add DT binding missing 'reg' property for child Root Ports
     (Krzysztof Kozlowski)

   - Fix theoretical string truncation in PHY name (Sergio Paracuellos)

  NVIDIA Tegra194 PCIe controller driver:

   - Return success for endpoint probe instead of falling through to the
     failure path (Vidya Sagar)

  Renesas R-Car PCIe controller driver:

   - Add DT binding missing IOMMU properties (Geert Uytterhoeven)

   - Add DT binding R-Car V4H compatible for host and endpoint mode
     (Yoshihiro Shimoda)

  Rockchip PCIe controller driver:

   - Configure endpoint BARs to be 64-bit based on the BAR type, not the
     BAR value (Niklas Cassel)

   - Add DT binding missing maxItems to ep-gpios (Krzysztof Kozlowski)

   - Set the Subsystem Vendor ID, which was previously zero because it
     was masked incorrectly (Rick Wertenbroek)

  Synopsys DesignWare PCIe controller driver:

   - Restructure DBI register access to accommodate devices where this
     requires Refclk to be active (Manivannan Sadhasivam)

   - Remove the deinit() callback, which was only need by the
     pcie-rcar-gen4, and do it directly in that driver (Manivannan
     Sadhasivam)

   - Add dw_pcie_ep_cleanup() so drivers that support PERST# can clean
     up things like eDMA (Manivannan Sadhasivam)

   - Rename dw_pcie_ep_exit() to dw_pcie_ep_deinit() to make it parallel
     to dw_pcie_ep_init() (Manivannan Sadhasivam)

   - Rename dw_pcie_ep_init_complete() to dw_pcie_ep_init_registers() to
     reflect the actual functionality (Manivannan Sadhasivam)

   - Call dw_pcie_ep_init_registers() directly from all the glue
     drivers, not just those that require active Refclk from the host
     (Manivannan Sadhasivam)

   - Remove the "core_init_notifier" flag, which was an obscure way for
     glue drivers to indicate that they depend on Refclk from the host
     (Manivannan Sadhasivam)

  TI J721E PCIe driver:

   - Add DT binding J784S4 SoC Device ID (Siddharth Vadapalli)

   - Add DT binding J722S SoC support (Siddharth Vadapalli)

  TI Keystone PCIe controller driver:

   - Add DT binding missing num-viewport, phys and phy-name properties
     (Jan Kiszka)

  Miscellaneous:

   - Constify and annotate with __ro_after_init (Heiner Kallweit)

   - Convert DT bindings to YAML (Krzysztof Kozlowski)

   - Check for kcalloc() failure in of_pci_prop_intr_map() (Duoming
     Zhou)"

* tag 'pci-v6.10-changes' of git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci: (97 commits)
  PCI: Do not wait for disconnected devices when resuming
  x86/pci: Skip early E820 check for ECAM region
  PCI: Remove unused pci_enable_device_io()
  ata: pata_cs5520: Remove unnecessary call to pci_enable_device_io()
  PCI: Update pci_find_capability() stub return types
  PCI: Remove PCI_IRQ_LEGACY
  scsi: vmw_pvscsi: Do not use PCI_IRQ_LEGACY instead of PCI_IRQ_LEGACY
  scsi: pmcraid: Use PCI_IRQ_INTX instead of PCI_IRQ_LEGACY
  scsi: mpt3sas: Use PCI_IRQ_INTX instead of PCI_IRQ_LEGACY
  scsi: megaraid_sas: Use PCI_IRQ_INTX instead of PCI_IRQ_LEGACY
  scsi: ipr: Use PCI_IRQ_INTX instead of PCI_IRQ_LEGACY
  scsi: hpsa: Use PCI_IRQ_INTX instead of PCI_IRQ_LEGACY
  scsi: arcmsr: Use PCI_IRQ_INTX instead of PCI_IRQ_LEGACY
  wifi: rtw89: Use PCI_IRQ_INTX instead of PCI_IRQ_LEGACY
  dt-bindings: PCI: rockchip,rk3399-pcie: Add missing maxItems to ep-gpios
  Revert "genirq/msi: Provide constants for PCI/IMS support"
  Revert "x86/apic/msi: Enable PCI/IMS"
  Revert "iommu/vt-d: Enable PCI/IMS"
  Revert "iommu/amd: Enable PCI/IMS"
  Revert "PCI/MSI: Provide IMS (Interrupt Message Store) support"
  ...

Pull kgdb updates from Daniel Thompson:
 "Nine patches this cycle and they split into just three topics:

   - Adopt coccinelle's recommendation to adopt str_plural()

   - A set of seven patches to refactor kdb_read() to improve both code
     clarity and its discipline with respect to fixed size buffers.

     This isn't just a refactor. Between them these also fix a cursor
     movement redraw problem and two buffer overflows (one latent and
     one real, albeit difficult to tickle).

   - Fix an NMI-safety problem when enqueuing kdb's keyboard reset code

  I wrote eight of the nine patches in this collection so many thanks to
  Doug Anderson for the reviews. The changes that affects
  drivers/tty/serial is acked by Greg KH"

* tag 'kgdb-6.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/danielt/linux:
  serial: kgdboc: Fix NMI-safety problems from keyboard reset code
  kdb: Simplify management of tmpbuffer in kdb_read()
  kdb: Replace double memcpy() with memmove() in kdb_read()
  kdb: Use format-specifiers rather than memset() for padding in kdb_read()
  kdb: Merge identical case statements in kdb_read()
  kdb: Fix console handling when editing and tab-completing commands
  kdb: Use format-strings rather than '\0' injection in kdb_read()
  kdb: Fix buffer overflow during tab-complete
  kdb: Use str_plural() to fix Coccinelle warning

Pull alpha updates from Arnd Bergmann:
 "I had investigated dropping support for alpha EV5 and earlier a while
  ago after noticing that this is the only supported CPU family in the
  kernel without native byte access and that Debian has already dropped
  support for this generation last year [1] in order to improve
  performance for the newer machines.

  This topic came up again when Paul McKenney noticed that parts of the
  RCU code already rely on byte access and do not work on alpha EV5
  reliably, so we decided on using my series to avoid the problem
  entirely.

  Al Viro did another series for alpha to address all the known build
  issues. I rebased his patches without any further changes and included
  it as a baseline for my work here to avoid conflicts and allow
  backporting the fixes to stable kernels for the now removed hardware
  support as well"

[ I dearly loved alpha back in the days, but the lack of byte and word
  operations was a horrible mistake and made everything worse -
  including very much the crazy IO contortions that resulted from it.

  It certainly wasn't the only mistake in the architecture, but it's the
  first-order issue.

  So while it's a bit sad to see the support for my first alpha go away,
  if you want to run museum hardware, maybe you should use museum
  kernels..    - Linus ]

* tag 'asm-generic-alpha' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic:
  alpha: drop pre-EV56 support
  alpha: cabriolet: remove EV5 CPU support
  alpha: remove LCA and APECS based machines
  alpha: sable: remove early machine support
  alpha: remove DECpc AXP150 (Jensen) support
  alpha: trim the unused stuff from asm-offsets.c
  alpha: jensen, t2 - make __EXTERN_INLINE same as for the rest
  alpha: core_lca: take the unused functions out
  alpha: missing includes
  alpha: sys_sio: fix misspelled ifdefs
  alpha: don't make functions public without a reason
  alpha: add clone3() support
  alpha: fix modversions for strcpy() et.al.
  alpha: sort scr_mem{cpy,move}w() out

If a serdev_device_driver is already loaded for a serdev_tty_port when it
gets registered by tty_port_register_device_attr_serdev() then that
driver's probe() method will be called immediately.

The serdev_device_driver's probe() method should then be able to call
serdev_device_open() successfully, but because UPF_DEAD is still dead
serdev_device_open() will fail with -ENXIO in this scenario:

  serdev_device_open()
  ctrl->ops->open()	/* this callback being ttyport_open() */
  tty->ops->open()	/* this callback being uart_open() */
  tty_port_open()
  port->ops->activate()	/* this callback being uart_port_activate() */
  Find bit UPF_DEAD is set in uport->flags and fail with errno -ENXIO.

Fix this be clearing UPF_DEAD before tty_port_register_device_attr_serdev()
note this only moves up the UPD_DEAD clearing a small bit, before:

  tty_port_register_device_attr_serdev();
  mutex_unlock(&tty_port.mutex);
  uart_port.flags &= ~UPF_DEAD;
  mutex_unlock(&port_mutex);

after:

  uart_port.flags &= ~UPF_DEAD;
  tty_port_register_device_attr_serdev();
  mutex_unlock(&tty_port.mutex);
  mutex_unlock(&port_mutex);

Reported-by: Weifeng Liu <weifeng.liu.z@gmail.com>
Closes: https://lore.kernel.org/platform-driver-x86/20240505130800.2546640-1-weifeng.liu.z@gmail.com/
Tested-by: Weifeng Liu <weifeng.liu.z@gmail.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20240509141549.63704-1-hdegoede@redhat.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

At the default TX trigger level of 2 in non-DMA mode (meaning that an
interrupt is generated when less than 2 characters are left in the
FIFO), we have observed frequent buffer underruns at 115200 Baud on an
i.MX8M Nano. This can cause communication issues if the receiving side
expects a continuous transfer.

Increasing the level to 8 makes the UART trigger an interrupt earlier,
giving the kernel enough time to refill the FIFO, at the cost of
triggering one interrupt per ~24 instead of ~30 bytes of transmitted
data (as the i.MX UART has a 32 byte FIFO).

Signed-off-by: Michael Krummsdorf <michael.krummsdorf@tq-group.com>
Signed-off-by: Matthias Schiffer <matthias.schiffer@ew.tq-group.com>
Link: https://lore.kernel.org/r/20240508133744.35858-1-matthias.schiffer@ew.tq-group.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

8250_pnp sets drvdata to line + 1 if the probe is successful. The users
of drvdata are in remove, suspend and resume callbacks, none of which
will be called if probe failed. The line acquired from drvdata can
never be zero in those functions and the checks for that can be
removed.

Eliminate also +/-1 step because all users of line subtract 1 from the
value.

These might have been leftover from legacy PM callbacks that could
be called without probe being successful.

Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20240506121202.11253-1-ilpo.jarvinen@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Avoid a superfluous unlock/lock-pair by simply moving the printout to
the end of bailing out.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Link: https://lore.kernel.org/r/20240506114016.30498-10-wsa+renesas@sang-engineering.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

The hrtimer for RXDMA timeout was unconditionally restarted in the RXDMA
complete handler ignoring the fact that setting up DMA may fail and PIO
is used instead. Explicitly stop the timer when DMA is completed and
only restart it when setting up DMA was successful. This makes the
intention of the timer much clearer, the driver easier to understand and
simplifies assumptions about the timer. The latter avoids race
conditions if these assumptions were not met or confused.

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Link: https://lore.kernel.org/r/20240506114016.30498-9-wsa+renesas@sang-engineering.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>