[v4,0/3] Add sysfs entry to EDL mode

Message

Qiang Yu April 23, 2024, 10:33 a.m. UTC

Add EDL sysfs entry for mhi controller that provides edl_trigger callback.
Add mhi_pci_generic_edl_trigger for qualcomm sdx55,sdx65 and sdx75 as
edl_trigger callback.

v3->v4:
1. Modify some comments, commit message and sysfs entry description.

2. Add error cleanups if get channel doorbell offset fail.

3. s/force_edl/trigger_edl

4. s/mhi_get_channel_doorbell/mhi_get_channel_doorbell_offset

5. Use mhi_get_channel_doorbell_offset in mhi_init_mmio()

v2->v3:
1. Update Documentation/ABI/stable/sysfs-bus-mhi with description of
   force_edl sysfs entry.

2. Add comments about edl_trigger callback in mhi_controller struct.

3. Follow reverse christmas tree in mhi_pci_generic_edl_trigger.

4. Add a new API in MHI to allow controller to get CHDB address and avoid
   duplicating the definition of CHDBOFF.

v1->v2:
1. Move all process needed by qualcomm sdx55,sdx65,sdx75 to enter EDL into
   mhi_pci_generic_edl_trigger() as the callback to edl_trigger.

2. MHI stack creates EDL sysfs entry to invoke edl_trigger callback so
   that devices need different mechanism to enter EDL can provide its own
   edl_trigger callabck .

Qiang Yu (3):
  bus: mhi: host: Add sysfs entry to force device to enter EDL
  bus: mhi: host: Add a new API for getting channel doorbell address
  bus: mhi: host: pci_generic: Add edl callback to enter EDL

 Documentation/ABI/stable/sysfs-bus-mhi | 13 ++++++++++
 drivers/bus/mhi/host/init.c            | 39 ++++++++++++++++++++++++++---
 drivers/bus/mhi/host/main.c            | 16 ++++++++++++
 drivers/bus/mhi/host/pci_generic.c     | 45 ++++++++++++++++++++++++++++++++++
 include/linux/mhi.h                    |  8 ++++++
 5 files changed, 117 insertions(+), 4 deletions(-)