[PATCH 0/2] i2c: qcom-geni: Quiesce hardware on shutdown and panic

[Praveen Talari]

This series hardens the GENI I2C driver against two related VM-teardown
scenarios where an in-flight I2C DMA transfer can trigger SMMU context
faults after the VM's memory context has already been invalidated.

Patch 1 adds a shutdown callback that cancels/aborts any in-progress
GENI or GPI DMA transfer and resets the TX/RX FSMs before a normal
reboot proceeds, so the hardware is left idle rather than mid-transfer.

Patch 2 adds a panic notifier that marks the I2C adapter suspended and
performs the same cancel/abort/DMA-reset cleanup as the shutdown path,
using atomic-context-safe DMA termination since panic notifiers cannot
sleep.

Together these prevent both hardware state corruption on reboot and
SMMU faults (which can affect other VMs sharing the same SMMU instance)
during VM shutdown/crash.

Signed-off-by: Praveen Talari <praveen.talari@xxxxxxxxxxxxxxxx>
---
Praveen Talari (2):
      i2c: qcom-geni: Add shutdown callback to quiesce hardware on reboot
      i2c: qcom-geni: Add panic notifier to prevent transfers during panic

 drivers/i2c/busses/i2c-qcom-geni.c | 77 ++++++++++++++++++++++++++++++++++++--
 1 file changed, 74 insertions(+), 3 deletions(-)
---
base-commit: 4477a78374a57c3809b172ad30cceabda48c47c6
change-id: 20260817-add-shutdown-and-panic-notifier-for-i2c-6723fc0f557e

Best regards,
--  
Praveen Talari <praveen.talari@xxxxxxxxxxxxxxxx>