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The msnd drivers do not implement system sleep callbacks today, so they have no defined way to recover DSP state after suspend. Add common card suspend/resume helpers, rerun the DSP initialization path on resume, restore the cached capture-source state, and rearm the shared IRQ for already-open users. Signed-off-by: Cássio Gabriel <cassiogabrielcontato@gmail.com> Link: https://patch.msgid.link/20260409-msnd-pm-support-v1-2-2abef720d0e7@gmail.com Signed-off-by: Takashi Iwai <tiwai@suse.de>