Hi, >> >> I'm looking now into that PVR SGX driver since a while. I already reworked that old "opensource" driver to work with a quite new kernel (4.16 or 4.17) [But that code got lost]. >> For the sunxi devices this was only a short coding session to get that running. For OMAP this might be easier/faster since the general linux situation is better. >> >> I'm not sure if we are able to provide a generic driver since there are different userspace versions that are only compatible with their own kernel driver. Not all compile flags for the kernel driver work with all userspace lib versions, at least on sunxi. Be aware that there are also different versions of those GPU ip cores and all have different features and bug fixes. > > Regarding that the DDK contains a lot of compile switches (#if for all bug fixes/errata). And different SoC and version glue are handled by code in > different eurasia_km / services4 / system subdirectories. Here are some hints which SGX versions and errata are supported by the TI/IMG kernel driver tree: http://git.goldelico.com/?p=letux-kernel.git;a=blob;f=drivers/staging/pvr/omap3/services4/srvkm/hwdefs/sgxerrata.h;h=92f721e06f26216c89b1f047c3aa7c4fc1cc35ad;hb=refs/heads/letux/omap-pvr >From that I see support of SGX520 SGX530 SGX531 SGX535 SGX540 SGX543 SGX544 SGX545 SGX554 Unfortunately this is handled by #ifdefs and therefore we can not (yet) build a single driver that fits al devices. Each one needs different CONFIG and emits a different binary kernel module. But IMHO it could be possible to replace the #if defined(SGX540) by some dynamic call to check for the compatible value. And also refine enabling individual errata handlers like "#define FIX_HW_BRN_31671 /* workaround in uKernel */" This will slow down code a little and make it grow, but would be more universal. I have also checked the latest DDK. These errata just add more SGX versions (SGX5300), but the code structure is the same. But his is some idea for future work. We need to really lay the common foundation first by agreeing how to work together. BTW: what about a specific mailing list? There was one installed by FSF and there was a Wiki but they are dead now https://libreplanet.org/wiki/Group:PowerVR_drivers Fortunately we have the wayback machine: https://web.archive.org/web/20170923050320/http://powervr.gnu.org.ve/doku.php BR, Nikolaus
