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Samsung PWM timer might be used as a clock source on some legacy systems. When PREEMPT_RT is enabled on ARM, regular spinlock is converted to a sleeping lock (mutex-based), which must not be used in atomic context such as hard interrupt handlers. Switch the samsung_pwm_lock to the raw_spinlock, which remains a true non-sleeping spinlock even under PREEMPT_RT. Fixes:7aac482e62("clocksource: samsung_pwm_timer: Make PWM spinlock global") Fixes:f11899894c("clocksource: add samsung pwm timer driver") Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@kernel.org> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com> Reviewed-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Acked-by: Uwe Kleine-König <ukleinek@kernel.org> Link: https://patch.msgid.link/20260713085653.1145015-1-m.szyprowski@samsung.com
34 lines
807 B
C
34 lines
807 B
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Copyright (C) 2013 Samsung Electronics Co., Ltd.
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*/
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#ifndef __CLOCKSOURCE_SAMSUNG_PWM_H
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#define __CLOCKSOURCE_SAMSUNG_PWM_H
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#include <linux/spinlock.h>
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#define SAMSUNG_PWM_NUM 5
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/*
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* Following declaration must be in an ifdef due to this symbol being static
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* in pwm-samsung driver if the clocksource driver is not compiled in and the
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* spinlock is not shared between both drivers.
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*/
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#ifdef CONFIG_CLKSRC_SAMSUNG_PWM
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extern raw_spinlock_t samsung_pwm_lock;
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#endif
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struct samsung_pwm_variant {
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u8 bits;
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u8 div_base;
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u8 tclk_mask;
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u8 output_mask;
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bool has_tint_cstat;
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};
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void samsung_pwm_clocksource_init(void __iomem *base,
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unsigned int *irqs,
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const struct samsung_pwm_variant *variant);
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#endif /* __CLOCKSOURCE_SAMSUNG_PWM_H */
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