From 55fc280e951ab2b39f3dcb640edc1b1eebc6d173 Mon Sep 17 00:00:00 2001 From: "Rob Herring (Arm)" Date: Mon, 31 Aug 2026 14:43:51 -0500 Subject: Input: tsc2007 - read "ti,poll-period" as u32 The "ti,poll-period" property is documented as a normal uint32 cell. The driver used a u64 helper, which makes the helper type disagree with the schema even though the stored value is still small. Read "ti,poll-period" with the u32 helper matching the documented DT cell size. Assisted-by: Codex:gpt-5-5 Signed-off-by: Rob Herring (Arm) Link: https://patch.msgid.link/20260831194352.1185860-1-robh@kernel.org Signed-off-by: Dmitry Torokhov --- include/asm-generic/mmiowb.h | 65 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 65 insertions(+) create mode 100644 include/asm-generic/mmiowb.h (limited to 'include/asm-generic/mmiowb.h') diff --git a/include/asm-generic/mmiowb.h b/include/asm-generic/mmiowb.h new file mode 100644 index 000000000..5698fca3b --- /dev/null +++ b/include/asm-generic/mmiowb.h @@ -0,0 +1,65 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +#ifndef __ASM_GENERIC_MMIOWB_H +#define __ASM_GENERIC_MMIOWB_H + +/* + * Generic implementation of mmiowb() tracking for spinlocks. + * + * If your architecture doesn't ensure that writes to an I/O peripheral + * within two spinlocked sections on two different CPUs are seen by the + * peripheral in the order corresponding to the lock handover, then you + * need to follow these FIVE easy steps: + * + * 1. Implement mmiowb() (and arch_mmiowb_state() if you're fancy) + * in asm/mmiowb.h, then #include this file + * 2. Ensure your I/O write accessors call mmiowb_set_pending() + * 3. Select ARCH_HAS_MMIOWB + * 4. Untangle the resulting mess of header files + * 5. Complain to your architects + */ +#ifdef CONFIG_MMIOWB + +#include +#include + +#ifndef arch_mmiowb_state +#include +#include + +DECLARE_PER_CPU(struct mmiowb_state, __mmiowb_state); +#define __mmiowb_state() raw_cpu_ptr(&__mmiowb_state) +#else +#define __mmiowb_state() arch_mmiowb_state() +#endif /* arch_mmiowb_state */ + +static inline void mmiowb_set_pending(void) +{ + struct mmiowb_state *ms = __mmiowb_state(); + + if (likely(ms->nesting_count)) + ms->mmiowb_pending = ms->nesting_count; +} + +static inline void mmiowb_spin_lock(void) +{ + struct mmiowb_state *ms = __mmiowb_state(); + ms->nesting_count++; +} + +static inline void mmiowb_spin_unlock(void) +{ + struct mmiowb_state *ms = __mmiowb_state(); + + if (unlikely(ms->mmiowb_pending)) { + ms->mmiowb_pending = 0; + mmiowb(); + } + + ms->nesting_count--; +} +#else +#define mmiowb_set_pending() do { } while (0) +#define mmiowb_spin_lock() do { } while (0) +#define mmiowb_spin_unlock() do { } while (0) +#endif /* CONFIG_MMIOWB */ +#endif /* __ASM_GENERIC_MMIOWB_H */ -- cgit v1.3.1