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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/drivers/pwm/pwm-lpss-platform.c
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@@ -1,13 +1,10 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * Intel Low Power Subsystem PWM controller driver
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  *
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  * Copyright (C) 2014, Intel Corporation
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  *
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  * Derived from the original pwm-lpss.c
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License version 2 as
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- * published by the Free Software Foundation.
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  */
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9
 
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 #include <linux/acpi.h>
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@@ -30,6 +27,7 @@
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 	.clk_rate = 19200000,
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 	.npwm = 1,
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 	.base_unit_bits = 16,
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+	.other_devices_aml_touches_pwm_regs = true,
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 };
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 /* Broxton */
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@@ -60,6 +58,7 @@
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 	platform_set_drvdata(pdev, lpwm);
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+	dev_pm_set_driver_flags(&pdev->dev, DPM_FLAG_SMART_PREPARE);
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 	pm_runtime_set_active(&pdev->dev);
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 	pm_runtime_enable(&pdev->dev);
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@@ -74,13 +73,28 @@
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 	return pwm_lpss_remove(lpwm);
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 }
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-static SIMPLE_DEV_PM_OPS(pwm_lpss_platform_pm_ops,
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-			 pwm_lpss_suspend,
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-			 pwm_lpss_resume);
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+static int pwm_lpss_prepare(struct device *dev)
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+{
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+	struct pwm_lpss_chip *lpwm = dev_get_drvdata(dev);
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+
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+	/*
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+	 * If other device's AML code touches the PWM regs on suspend/resume
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+	 * force runtime-resume the PWM controller to allow this.
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+	 */
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+	if (lpwm->info->other_devices_aml_touches_pwm_regs)
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+		return 0; /* Force runtime-resume */
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+
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+	return 1; /* If runtime-suspended leave as is */
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+}
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+
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+static const struct dev_pm_ops pwm_lpss_platform_pm_ops = {
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+	.prepare = pwm_lpss_prepare,
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+};
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 static const struct acpi_device_id pwm_lpss_acpi_match[] = {
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 	{ "80860F09", (unsigned long)&pwm_lpss_byt_info },
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 	{ "80862288", (unsigned long)&pwm_lpss_bsw_info },
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+	{ "80862289", (unsigned long)&pwm_lpss_bsw_info },
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 	{ "80865AC8", (unsigned long)&pwm_lpss_bxt_info },
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 	{ },
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 };