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i2c: cadence: Add shutdown handler

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During system reboot or kexec, in-flight I2C transfers can cause
spurious interrupts or leave the bus in an undefined state. Add a
shutdown handler that marks the adapter suspended and resets the
controller, ensuring a clean handoff.

Signed-off-by: Ajay Neeli <ajay.neeli@amd.com>
Acked-by: Michal Simek <michal.simek@amd.com>
Reviewed-by: Radhey Shyam Pandey <radhey.shyam.pandey@amd.com>
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
Link: https://lore.kernel.org/r/20260430053050.3590173-1-ajay.neeli@amd.com
This commit is contained in:
Ajay Neeli 2026-04-30 11:00:50 +05:30 committed by Andi Shyti
parent aa0f846f61
commit f612925f98
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1 changed files with 20 additions and 0 deletions
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20
drivers/i2c/busses/i2c-cadence.c
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@ -1635,6 +1635,25 @@ static void cdns_i2c_remove(struct platform_device *pdev)
reset_control_assert(id->reset);
}
/**
* cdns_i2c_shutdown - Prepare I2C controller for system shutdown
* @pdev: Handle to the platform device structure
*
* Mark the adapter as suspended and reset the controller to ensure a clean
* handoff during system reboot or kexec.
*/
static void cdns_i2c_shutdown(struct platform_device *pdev)
{
struct cdns_i2c *id = platform_get_drvdata(pdev);
/* Mark the adapter as suspended to prevent further I2C transfers */
i2c_mark_adapter_suspended(&id->adap);
/* Reset the controller state if active - clocks are disabled when suspended */
if (!pm_runtime_status_suspended(&pdev->dev))
cdns_i2c_master_reset(&id->adap);
}
static struct platform_driver cdns_i2c_drv = {
.driver = {
.name = DRIVER_NAME,
@ -1643,6 +1662,7 @@ static struct platform_driver cdns_i2c_drv = {
},
.probe = cdns_i2c_probe,
.remove = cdns_i2c_remove,
.shutdown = cdns_i2c_shutdown,
};
module_platform_driver(cdns_i2c_drv);