On Tue, Jan 06, 2015 at 08:27:06PM +0800, Vince Hsu wrote: > > On 01/06/2015 07:49 PM, Thierry Reding wrote: > >* PGP Signed by an unknown key > > > >On Mon, Jan 05, 2015 at 08:50:18PM +0100, Alexandre Courbot wrote: > >>On Mon, Jan 5, 2015 at 4:32 PM, Thierry Reding <thierry.red...@gmail.com> > >>wrote: > >>>On Tue, Dec 30, 2014 at 11:18:34AM +0800, Vince Hsu wrote: > >>>>Hi Emil, > >>>> > >>>>On 12/30/2014 10:34 AM, Emil Velikov wrote: > >>>>>On 23/12/14 10:40, Vince Hsu wrote: > >>>>>>This patch adds some checks in the suspend/resume functions to > >>>>>>distinguish > >>>>>>the dGPU and mobile GPU and exports some variables/functions so that the > >>>>>>nouveau platform device can reuse them. > >>>>>> > >>>>>Hi Vince, > >>>>> > >>>>>Afaiu one needs to export a symbol as it's used by another module or > >>>>>subsystem. With the follow up two patches you are not doing either one, > >>>>>so I'd assume that you can just omit the EXPORT_* changes. > >>>>The nouveau platform device driver is built as another module - > >>>>nouveau_platform.ko. :) > >>>I'd like to hear the opinion of the nouveau people and Alex, but I'd > >>>very much prefer if nouveau_platform.o was simply linked into the > >>>nouveau.ko module. I don't see any good reason to keep it separate. > >>Yep, I agree. The decision to host platform support in a separate > >>module looks misleaded if it results in additional exports that we > >>would otherwise avoid. IIUC I did this to be able to use the module > >>convenience macros to register the platform driver. > >> > >>>Something like the attached patch (untested) ought to do it. > >>This patch alone won't be enough for the reason I mentioned above. > >>However, if Vince doesn't mind handling the platform driver > >>registration manually in nouveau_drm_init/nouveau_drm_exit, I agree > >>this would be the way to go. > >If we do the conversion to generic power domains, the only Tegra- > >specific API remaining will be the access to the fuse registers for the > >speedo value. At that point we wouldn't need the ARCH_TEGRA dependency > >any longer and could always build the platform driver along with the PCI > >driver. > Do we really want the platform driver always built with the PCI driver even > there is no dependency between them. Actually I have some patches to > build the platform driver with !CONFIG_PCI and would like to post them maybe > later.
I do see some advantage in making Nouveau build with !CONFIG_PCI because it allows building the driver for an SoC without PCI. But I think always compiling whatever is available won't hurt. Nouveau itself is rather big (~1 MiB of text and ~120 KiB of data) whereas the platform code weighs in at around 1.5 KiB of text and 108 B of data. I suspect that the PCI glue is equally negligible. Thierry
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