diff options
| author | Manikanta Guntupalli <manikanta.guntupalli@amd.com> | 2025-07-30 20:42:07 +0530 |
|---|---|---|
| committer | Alexandre Belloni <alexandre.belloni@bootlin.com> | 2025-09-16 17:06:43 +0200 |
| commit | 17e163f3d7a5449fe9065030048e28c4087b24ce (patch) | |
| tree | 07124489e9370d6babdb438f72b28eaa13cd94d8 /drivers/i3c | |
| parent | bc7dd24c114e37c67061f4651bbbbbc57106c617 (diff) | |
i3c: dw: Add shutdown support to dw_i3c_master driver
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>
Diffstat (limited to 'drivers/i3c')
| -rw-r--r-- | drivers/i3c/master/dw-i3c-master.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/i3c/master/dw-i3c-master.c b/drivers/i3c/master/dw-i3c-master.c index 974122b2d20e..9ceedf09c3b6 100644 --- a/drivers/i3c/master/dw-i3c-master.c +++ b/drivers/i3c/master/dw-i3c-master.c @@ -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) }; +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[] = { { .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 = { .probe = dw_i3c_probe, .remove = dw_i3c_remove, + .shutdown = dw_i3c_shutdown, .driver = { .name = "dw-i3c-master", .of_match_table = dw_i3c_master_of_match, |