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The rate matching calculations are done in the system clock domain. If the driver ticks at a different rate, the correction factor needs to be adjusted by the rate_diff. This fixes ISO streams getting out of sync with each other when target delay changes. This happens because typically one of them is the driver and the other follower. Driver adjust clock rate, and follower does its own adjustment *on top of that* so it rate matches more or less at double speed. (The DLL of the follower to some degree corrects for this, but can't do that when hitting RATE_CTL_DIFF_MAX and moreover it acts with a delay.) |
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