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i3c: dw: Add shutdown support to dw_i3c_master driver

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[ Upstream commit 17e163f3d7 ]

Add shutdown handler to the Synopsys DesignWare I3C master driver,
ensuring the device is gracefully disabled during system shutdown.

The shutdown handler cancels any pending hot-join work and disables
interrupts.

Signed-off-by: Manikanta Guntupalli <manikanta.guntupalli@amd.com>
Link: https://lore.kernel.org/r/20250730151207.4113708-1-manikanta.guntupalli@amd.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Manikanta Guntupalli
2025-07-30 20:42:07 +05:30
committed by Greg Kroah-Hartman
parent 2212651199
commit b13e199e4b
1 changed files with 23 additions and 0 deletions
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23
drivers/i3c/master/dw-i3c-master.c
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@@ -1737,6 +1737,28 @@ static const struct dev_pm_ops dw_i3c_pm_ops = {
SET_RUNTIME_PM_OPS(dw_i3c_master_runtime_suspend, dw_i3c_master_runtime_resume, NULL) SET_RUNTIME_PM_OPS(dw_i3c_master_runtime_suspend, dw_i3c_master_runtime_resume, NULL)
}; };
static void dw_i3c_shutdown(struct platform_device *pdev)
{
struct dw_i3c_master *master = platform_get_drvdata(pdev);
int ret;
ret = pm_runtime_resume_and_get(master->dev);
if (ret < 0) {
dev_err(master->dev,
"<%s> cannot resume i3c bus master, err: %d\n",
__func__, ret);
return;
}
cancel_work_sync(&master->hj_work);
/* Disable interrupts */
writel((u32)~INTR_ALL, master->regs + INTR_STATUS_EN);
writel((u32)~INTR_ALL, master->regs + INTR_SIGNAL_EN);
pm_runtime_put_autosuspend(master->dev);
}
static const struct of_device_id dw_i3c_master_of_match[] = { static const struct of_device_id dw_i3c_master_of_match[] = {
{ .compatible = "snps,dw-i3c-master-1.00a", }, { .compatible = "snps,dw-i3c-master-1.00a", },
{}, {},
@@ -1752,6 +1774,7 @@ MODULE_DEVICE_TABLE(acpi, amd_i3c_device_match);
static struct platform_driver dw_i3c_driver = { static struct platform_driver dw_i3c_driver = {
.probe = dw_i3c_probe, .probe = dw_i3c_probe,
.remove = dw_i3c_remove, .remove = dw_i3c_remove,
.shutdown = dw_i3c_shutdown,
.driver = { .driver = {
.name = "dw-i3c-master", .name = "dw-i3c-master",
.of_match_table = dw_i3c_master_of_match, .of_match_table = dw_i3c_master_of_match,