On 14.02.2023 23:26, Mark Brown wrote: > On Tue, Feb 14, 2023 at 10:14:28AM -0800, Lars-Peter Clausen wrote: >> On 2/14/23 08:14, Claudiu Beznea wrote: >>> @@ -450,6 +450,8 @@ int snd_dmaengine_pcm_register(struct device *dev, >>> else >>> driver = &dmaengine_pcm_component; >>> + driver->start_dma_last = config->start_dma_last; >> This will break if you have multiple sound cards in the system. >> dmaengine_pcm_component must stay const. > Right, if we need to modify it we either need to select which of > multiple const structs to register or to take a copy and modify > that. I've not looked at the actual changes yet. OK, I will try that and return with a new patch. On the other hand do you think the other solution presented in cover letter would be better? From the cover letter: "The other solution that was identified for this was to extend the already existing mechanism around struct snd_soc_dai_link::stop_dma_first. The downside of this was that a potential struct snd_soc_dai_link::start_dma_last would have to be populated on sound card driver thus, had to be taken into account in all sound card drivers. At the moment, the mchp-pdmc is used only with simple-audio-card. In case of simple-audio-card a new DT binding would had to be introduced to specify this action on dai-link descriptions (as of my investigation)." Thank you, Claudiu
