Subject: [PATCH v8 0/9] Updates to MHI channel handling
MHI specification shows a state machine with support for STOP channel command
and the validity of certain state transitions. MHI host currently does not
provide any mechanism to stop a channel and restart it without resetting it.
There are also times when the device moves on to a different execution
environment while client drivers on the host are unaware of it and still
attempt to reset the channels facing unnecessary timeouts.
This series addresses the above areas to provide support for stopping an MHI
channel, resuming it back, improved documentation and improving upon channel
state machine handling in general.
This set of patches was tested on arm64 and x86_64 architecture.
v8:
-Split the state machine improvements patch to three patches as per review
v7:
-Tested on x86_64 architecture
-Drop the patch "Do not clear channel context more than once" as issue is fixed
differently using "bus: mhi: core: Fix double dma free()"
-Update the commit text to better reflect changes on state machine improvements
v6:
-Dropped the patch which introduced start/stop transfer APIs for lack of users
-Updated error handling and debug prints on channel handling improvements patch
-Improved commit text to better explain certain patches based on review comments
-Removed references to new APIs from the documentation improvement patch
v5:
-Added reviewed-by tags from Hemant I missed earlier
-Added patch to prevent kernel warnings on clearing channel context twice
v4:
-Updated commit text/descriptions and addressed checkpatch checks
-Added context validity check before starting/stopping channels from new API
-Added patch to clear channel context configuration after reset/unprepare
v3:
-Updated documentation for channel transfer APIs to highlight differences
-Create separate patch for "allowing channel to be disabled from stopped state"
v2:
-Renamed the newly introduced APIs to mhi_start_transfer() / mhi_stop_transfer()
-Added improved documentation to avoid confusion with the new APIs
-Removed the __ prefix from mhi_unprepare_channel() API for consistency.
Bhaumik Bhatt (9):
bus: mhi: core: Allow sending the STOP channel command
bus: mhi: core: Clear context for stopped channels from remove()
bus: mhi: core: Improvements to the channel handling state machine
bus: mhi: core: Update debug messages to use client device
bus: mhi: core: Hold device wake for channel update commands
bus: mhi: core: Clear configuration from channel context during reset
bus: mhi: core: Check channel execution environment before issuing
reset
bus: mhi: core: Remove __ prefix for MHI channel unprepare function
bus: mhi: Improve documentation on channel transfer setup APIs
drivers/bus/mhi/core/init.c | 22 ++++-
drivers/bus/mhi/core/internal.h | 12 +++
drivers/bus/mhi/core/main.c | 190 ++++++++++++++++++++++++----------------
include/linux/mhi.h | 18 +++-
4 files changed, 162 insertions(+), 80 deletions(-)
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