Merge tag 'mhi-for-v6.8' of git://git.kernel.org/pub/scm/linux/kernel/git/mani/mhi...

Merge tag 'mhi-for-v6.8' of git://git.kernel.org/pub/scm/linux/kernel/git/mani/mhi into char-misc-next

Manivannan writes:

MHI Host
========

- Added alignment check for event ring read pointer to avoid the potential
  buffer corruption issue.
- Added support for SDX75 modem which takes longer time to enter READY state.
- Added spinlock to protect concurrent access while queuing transfer ring
  elements.
- Dropped the read channel lock before invoking the client callback as the
  client can potentially queue buffers thus ending up wtih soft lockup.

MHI Endpoint
============

- Used kzalloc() to allocate event ring elements instead of allocating the
  elements on the stack, as the endpoint controller trying to queue them may not
  be able to use vmalloc memory (using DMA).
- Used slab allocator for allocting the memory for objects used frequently and
  are of fixed size.
- Added support for interrupt moderation timer feature which is used by the host
  to limit the number of interrupts raised by the device for an event ring.
- Added async read/write DMA support for transferring data between host and the
  endpoint. So far MHI EP stack assumed that the data will be transferred
  synchronously (i.e., it sends completion once the transfer APIs are returned).
  But this impacts the throughput if the controller is using DMA to do the
  transfer.

  So to add async suport, existing sync transfer APIs are renamed to
  {read/write}_sync and also introduced two new APIs {read/write}_async for
  carrying out the async transfer.

  Controllers implementing the async APIs should queue the buffers and return
  immediately without waiting for transfer completion. Once the transfer
  completion happens later, they should invoke the completion callback so that
  the MHI EP stack can send the completion event to the host.

  The controller driver patches (PCI EPF) for this async support are also merged
  to the MHI tree with Acks from PCI maintainers.
- Fixed the DMA channel direction in error path of the PCI EPF driver.

* tag 'mhi-for-v6.8' of git://git.kernel.org/pub/scm/linux/kernel/git/mani/mhi:
  bus: mhi: host: Drop chan lock before queuing buffers
  bus: mhi: host: Add spinlock to protect WP access when queueing TREs
  PCI: epf-mhi: Fix the DMA data direction of dma_unmap_single()
  bus: mhi: ep: Add checks for read/write callbacks while registering controllers
  bus: mhi: ep: Add support for async DMA read operation
  bus: mhi: ep: Add support for async DMA write operation
  PCI: epf-mhi: Enable MHI async read/write support
  PCI: epf-mhi: Add support for DMA async read/write operation
  PCI: epf-mhi: Simulate async read/write using iATU
  bus: mhi: ep: Introduce async read/write callbacks
  bus: mhi: ep: Rename read_from_host() and write_to_host() APIs
  bus: mhi: ep: Pass mhi_ep_buf_info struct to read/write APIs
  bus: mhi: ep: Add support for interrupt moderation timer
  bus: mhi: ep: Use slab allocator where applicable
  bus: mhi: host: Add alignment check for event ring read pointer
  bus: mhi: host: pci_generic: Add SDX75 based modem support
  bus: mhi: host: Add a separate timeout parameter for waiting ready
  bus: mhi: ep: Do not allocate event ring element on stack