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As per FW Interface Modules Configuration, init instance IPC request requires base initial module configuration. This configuration structure is made of: - cpc (chunks per cycle) - ibs (input buffer size) - obs (output buffer size) - is_pages (memory pages required) - audio_fmt (self explanatory) Skylake topology accepts following tokens: MCPS, CPS and CPC. All of these are directly connected. Moreover, assigning one of these allows to calculate the remaining two. In simplest scenario and assuming 1ms scheduling, following is true: CPS = CPC times 1000 MCPS = CPS times 1000 000 Note: these calculations vary depending on scenario and scheduling requirements. Given the current implementation, userspace is allowed to provide different values for all three causing informational chaos. On top of that, struct skl_base_cfg which represents base module configuration, incorrectly takes CPS param instead of CPC. This ambiguity may lead to user unintentionally providing improper values to DSP firmware and thus impacting module scheduling in unexpected fashion. Fix by making MCPS and CPS topology params obsolete and relying solely on CPC value. Signed-off-by: Cezary Rojewski <cezary.rojewski@intel.com> Link: https://lore.kernel.org/r/20190723145854.8527-7-cezary.rojewski@intel.com Signed-off-by: Mark Brown <broonie@kernel.org>