Em 25-05-2011 20:43, Laurent Pinchart escreveu: > Issues arise when devices have floating point registers. And yes, that > happens, I've learnt today about an I2C sensor with floating point registers > (in this specific case it should probably be put in the broken design > category, but it exists :-)). Huh! Yeah, an I2C sensor with FP registers sound weird. We need more details in order to address those. >>> There's an industry trend there, and we need to think about solutions now >>> otherwise we will be left without any way forward when too many devices >>> will be impossible to support from kernelspace (OMAP4 is a good example >>> there, some device drivers require communication with other cores, and >>> the communication API is implemented in userspace). >> >> Needing to go to userspace to allow inter-core communication seems very >> bad. I seriously doubt that this is a trend. It seems more like a >> broken-by-design type of architecture. > > I'm inclined to agree with you, but we should address these issues now, while > we have relatively few devices impacted by them. I fear that ignoring the > problem and hoping it will go away by itself will bring us to a difficult > position in the future. We should show the industry in which direction we > would like it to go. I'm all about showing the industry in with direction we would like it to go. We want that all Linux-supported architectures/sub-architectures support inter-core communications in kernelspace, in a more efficient way that it would happen if such communication would happen in userspace. Thanks, Mauro. -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
