Re: [PATCH v4 6/9] power: reset: macsmc-reboot: Add driver for rebooting via Apple SMC

thanks for the review!

On Fri, May 9, 2025, at 15:05, Alyssa Rosenzweig wrote:

quoted

+	for (i = 0; i < ARRAY_SIZE(ac_power_mode_map); i++)
+		if (mode == ac_power_mode_map[i])
+			len += scnprintf(buf+len, PAGE_SIZE-len,
+					 "[%s] ", ac_power_modes[i]);
+		else
+			len += scnprintf(buf+len, PAGE_SIZE-len,
+					 "%s ", ac_power_modes[i]);

Nit: { braces } at least on the for loop...

Will fix that.

(And might be more concise as

    for (i = 0; i < ARRAY_SIZE(ac_power_mode_map); i++) {
        bool match = (mode == ac_power_mode_map[i]);
        len += scnprintf(buf+len, PAGE_SIZE-len,
                 match ? "[%s] " : "%s ", ac_power_modes[i]);
    }

though IDK how people feel about it.)

imho it's less readable that way but I don't have a strong opinion
either way.

quoted

+		mdelay(100);
+		WARN_ON(1);

...What?

This is done in a few drivers in drivers/power/reboot. If we haven't
rebooted after 100ms something's wrong with SMC. I'll add a comment.

drivers/power/reset/tps65086-restart.c:	WARN_ON(1);
drivers/power/reset/atc260x-poweroff.c:	WARN_ONCE(1, "Unable to power off system\n");
drivers/power/reset/mt6323-poweroff.c:	WARN_ONCE(1, "Unable to power off system\n");
drivers/power/reset/gpio-restart.c:	WARN_ON(1);
drivers/power/reset/regulator-poweroff.c:	WARN_ON(1);

quoted

+	if (ret)
+		return dev_err_probe(&pdev->dev, ret,
+				     "Failed to register power-off handler\n");
+
+
+	ret = devm_register_sys_off_handler(&pdev->dev, SYS_OFF_MODE_RESTART_PREPARE,
+					    SYS_OFF_PRIO_HIGH, macsmc_prepare_atomic, reboot);

Nit: squash double blank-line

will do.


thanks,


Sven