Hi all Of the following 2 patches the first one just adds a helper function to soc-camera core, and the second one removes the worst cases of "coffee-ground reading" from the driver. By this I mean optimisation attempts, trying to combine client (e.g., camera sensor driver) and host (CEU, bridge) cropping and scaling to achieve best results. Where "best results" meant as close to user-requesed configuration as possible with minimum bandwidth waste. Even though the results were pretty good, the implementation made the driver very complex, hard to maintain and loaded with calculations less trivial, than what we like to have in the kernel.
With the move to the Media Controller these optimisations can and shall be carried out in the user-space with each driver being configured separately for its specific cropping and scaling tasks. Even though we want to preserve the ability to work with standard V4L2 applications even without the need for an initial set up, we can now remove all those optimisations and only keep a couple of simple cases for backwards compatibility. These "simple" cases include situations, where the CEU driver forwards an S_CROP or an S_FMT to the subdevice driver(s), then checks the result and if there is a _simple_ way to improve it, then it does that. Most importantly all cases of cropping (on CEU / bridge) on top of scaling (subdevice), which lead to the need to calculate subdevice scaling factors and use them to calculate host cropping and its projection on the sensor plane... I don't think we manage to get these patches in 3.2, especially, since they mostly make sense in conmbination with the soc-camera Media Controller patches, which also are not quite finished yet. So, these patches are an early preview. They should be applied on top of what will become the soc-camera 3.2 pull, an almost final version of which is available at git://linuxtv.org/gliakhovetski/v4l-dvb.git rc1-for-3.2 Thanks Guennadi --- Guennadi Liakhovetski, Ph.D. Freelance Open-Source Software Developer http://www.open-technology.de/ -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
