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x86/amd_node: Add a smn_read_register() helper

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Some of the ACP drivers will poll registers through SMN using
read_poll_timeout() which requires returning the result of the register read
as the argument.

Add a helper to do just that.

Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20250217231747.1656228-2-superm1@kernel.org
This commit is contained in:
Mario Limonciello
2025-02-17 17:17:41 -06:00
committed by Ingo Molnar
parent 9c19cc1f5f
commit 4476e7f814
1 changed files with 11 additions and 0 deletions
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11
arch/x86/include/asm/amd_node.h
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@@ -46,4 +46,15 @@ static inline int __must_check amd_smn_hsmp_rdwr(u16 node, u32 address, u32 *val
}
#endif /* CONFIG_AMD_NODE */
/* helper for use with read_poll_timeout */
static inline int smn_read_register(u32 reg)
{
int data, rc;
rc = amd_smn_read(0, reg, &data);
if (rc)
return rc;
return data;
}
#endif /*_ASM_X86_AMD_NODE_H_*/