On 09/03/18 20:27, Benoit Parrot wrote: >> Is logical plane a h/w concept? > > It does represent a hardware resource. Logical plane is not a hw concept, it just describes a group of one or two HW planes. Then again, in the context of 2k+ displays, two HW planes must always be used together, so that way it could be considered a single HW resource. >> Really, I'm skeptical that any of this belongs in DT. For example, >> can't you figure out you need 2 physical planes whenever your >> panel/timing width is greater than 2048? > > As stated in the description I added above, we cannot have resources > exposed to user-space which can "disappear" dynamically. > Doing so would break user-space applications which rely on these > resources. The question is, if not in DT, then where? I agree that this is not exactly describing the HW. But it can't be done dynamically either (or at least we have not figured out a way). And it must be user configurable. Module parameters are an option, but it would be somewhat difficult to give all this information there. And also, if your board has a 2k+ display, you must have these configurations given to the driver, it's not optional. And while it's perhaps stretching the definitions a bit, I guess one could argue that this describes the HW in a way: it describes how the HW resources must be used if you have a display of 2k+ width, and is not as such related to Linux or DRM. Tomi -- Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki. Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
