Re: [PATCH 2/2] firmware: imx: sm-misc: Print boot/shutdown reasons

[Alexander Stein]

Hi,

Am Donnerstag, 5. März 2026, 02:56:45 CET schrieb Peng Fan (OSS):
> From: Peng Fan <peng.fan@xxxxxxx>
> 
> Add reset reason string table for i.MX95 and introduce a helper
> (scmi_imx_misc_get_reason) to query and print both system and LM
> (Logical Machine) reset reasons via the SCMI MISC protocol.
> 
> Signed-off-by: Peng Fan <peng.fan@xxxxxxx>
> ---
>  drivers/firmware/imx/sm-misc.c | 73 ++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 73 insertions(+)
> 
> diff --git a/drivers/firmware/imx/sm-misc.c b/drivers/firmware/imx/sm-misc.c
> index 0a8ada329c9de3c1627da241bf142fa91a8085d7..16b5ff833d21274403a4c55abe2fa1f49fce3e73 100644
> --- a/drivers/firmware/imx/sm-misc.c
> +++ b/drivers/firmware/imx/sm-misc.c
> @@ -18,6 +18,29 @@ static const struct scmi_imx_misc_proto_ops *imx_misc_ctrl_ops;
>  static struct scmi_protocol_handle *ph;
>  struct notifier_block scmi_imx_misc_ctrl_nb;
>  
> +static const char * const rst_imx95[] = {
> +	"cm33_lockup", "cm33_swreq", "cm7_lockup", "cm7_swreq", "fccu",
> +	"jtag_sw", "ele", "tempsense", "wdog1", "wdog2", "wdog3", "wdog4",
> +	"wdog5", "jtag", "cm33_exc", "bbm", "sw", "sm_err", "fusa_sreco",
> +	"pmic", "unused", "unused", "unused", "unused", "unused", "unused",
> +	"unused", "unused", "unused", "unused", "unused", "por",
> +};
> +
> +static const char * const rst_imx94[] = {
> +	"cm33_lockup", "cm33_swreq", "cm70_lockup", "cm70_swreq", "fccu",
> +	"jtag_sw", "ele", "tempsense", "wdog1", "wdog2", "wdog3", "wdog4",
> +	"wdog5", "jtag", "wdog6", "wdog7", "wdog8", "wo_netc", "cm33s_lockup",
> +	"cm33s_swreq", "cm71_lockup", "cm71_swreq", "cm33_exc", "bbm", "sw",
> +	"sm_err", "fusa_sreco", "pmic", "unused", "unused", "unused", "por",
> +};
> +
> +static const struct of_device_id allowlist[] = {
> +	{ .compatible = "fsl,imx952", .data = rst_imx95 },
> +	{ .compatible = "fsl,imx95", .data = rst_imx95 },
> +	{ .compatible = "fsl,imx94", .data = rst_imx94 },
> +	{ /* Sentinel */ }
> +};
> +
>  int scmi_imx_misc_ctrl_set(u32 id, u32 val)
>  {
>  	if (!ph)
> @@ -75,6 +98,54 @@ static void scmi_imx_misc_put(void *p)
>  	debugfs_remove((struct dentry *)p);
>  }
>  
> +static int scmi_imx_misc_get_reason(struct scmi_device *sdev)
> +{
> +	struct scmi_imx_misc_reset_reason boot, shutdown;
> +	const char **rst;
> +	bool system = true;
> +	int ret;
> +
> +	if (!of_machine_device_match(allowlist))
> +		return 0;
> +
> +	rst = (const char **)of_machine_get_match_data(allowlist);
> +
> +	ret = imx_misc_ctrl_ops->misc_reset_reason(ph, system, &boot, &shutdown, NULL);
> +	if (!ret) {
> +		if (boot.valid)
> +			dev_info(&sdev->dev, "%s Boot reason: %s, origin: %d, errid: %d\n",
> +				 system ? "SYS" : "LM", rst[boot.reason],
> +				 boot.orig_valid ? boot.origin : -1,
> +				 boot.err_valid ? boot.errid : -1);
> +		if (shutdown.valid)
> +			dev_info(&sdev->dev, "%s shutdown reason: %s, origin: %d, errid: %d\n",
> +				 system ? "SYS" : "LM", rst[shutdown.reason],
> +				 shutdown.orig_valid ? shutdown.origin : -1,
> +				 shutdown.err_valid ? shutdown.errid : -1);
> +	} else {
> +		dev_err(&sdev->dev, "Failed to get system reset reason: %d\n", ret);
> +	}
> +
> +	system = false;
> +	ret = imx_misc_ctrl_ops->misc_reset_reason(ph, system, &boot, &shutdown, NULL);
> +	if (!ret) {
> +		if (boot.valid)
> +			dev_info(&sdev->dev, "%s Boot reason: %s, origin: %d, errid: %d\n",
> +				 system ? "SYS" : "LM", rst[boot.reason],
> +				 boot.orig_valid ? boot.origin : -1,
> +				 boot.err_valid ? boot.errid : -1);
> +		if (shutdown.valid)
> +			dev_info(&sdev->dev, "%s shutdown reason: %s, origin: %d, errid: %d\n",
> +				 system ? "SYS" : "LM", rst[shutdown.reason],
> +				 shutdown.orig_valid ? shutdown.origin : -1,
> +				 shutdown.err_valid ? shutdown.errid : -1);

Is there a way to query this from userspace programs instead of printing into kernel log?

Best regards,
Alexander

> +	} else {
> +		dev_err(&sdev->dev, "Failed to get lm reset reason: %d\n", ret);
> +	}
> +
> +	return 0;
> +}
> +
>  static int scmi_imx_misc_ctrl_probe(struct scmi_device *sdev)
>  {
>  	const struct scmi_handle *handle = sdev->handle;
> @@ -133,6 +204,8 @@ static int scmi_imx_misc_ctrl_probe(struct scmi_device *sdev)
>  	scmi_imx_dentry = debugfs_create_dir("scmi_imx", NULL);
>  	debugfs_create_file("syslog", 0444, scmi_imx_dentry, &sdev->dev, &syslog_fops);
>  
> +	scmi_imx_misc_get_reason(sdev);
> +
>  	return devm_add_action_or_reset(&sdev->dev, scmi_imx_misc_put, scmi_imx_dentry);
>  }
>  
> 
> 


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