On Thu, Sep 25, 2014 at 08:10:31PM +0200, Sjoerd Simons wrote: > On Thu, 2014-09-25 at 18:41 +0200, Thierry Reding wrote: > > 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). > > Assuming you're talking about "ARM: tegra: Disable VPR",that has landed > in u-boot master and released as part of v2014.10-rc2 [0] Oh, good. > > 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? > > I guess in that case the vdd-supply should still be added to the dts > with u-boot toggling the status field of the node? Yes, if that's what we decide on then this patch should be modified to remove the status = "okay" line. Thierry
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