On Thu, Sep 25, 2014 at 09:48:01AM -0600, Stephen Warren wrote: > On 09/25/2014 07:27 AM, Sjoerd Simons wrote: > >Playing a bit with todays linux-next on my jetson, it seems this patch is > >still required for enabling the GPU. Is there anything blocking it (firmware > >not available yet in liux-firmware?) > > I think initially I was waiting for the DRM patch "drm/nouvea: support for > probing platform devices" to be applied, but it looks like that's been > applied already, so only patches 4 and 5 in this series are still > outstanding. > > Alex, wasn't there also some issue where the VPR register had to be > programmed, and if it wasn't there'd be a hang when the GPU registers were > touched? If we've added code to Nouveau/tegradrm to detect that and avoid > the problem, then I guess we can commit these last two patches for 3.19. A > resend after the 3.18 merge window might help. A patch that programs VPR was merged into U-Boot (though I don't think it's made it into master yet). I'm not sure we can reasonably check for that in Nouveau, given that the register is somewhere completely unrelated. In fact I think the U-Boot patch was triggered by some discussion about how to solve this and it was decided that it shouldn't be done in the kernel, but U-Boot should set it up. That said, perhaps one solution would be to make U-Boot enable the gk20a device if it's set up the VPR and disable it otherwise? Thierry
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