On 03/05/11(Tue) 22:24, Mark Kettenis wrote:
> > Date: Tue, 26 Apr 2011 18:29:16 +0530
> > From: Martin Pieuchot <[email protected]>
> >
> > The following diff adds support for dfs. It requires my precedent patch
> > about GPIOs. I don't have a machine with a MPC7448 so it's only tested
> > with a MPC7447A.
> >
> > I'm also interested in various device-tree dumps for further development.
> > If you can send me yours, contact me off list.
> >
> > Comments ?
>
> Looks good! Unfortunately the G4 mini (which has the MPC7447A)
> doesn't support this.
Can you send me your device-tree dump? If it's really a MPC7447A (not a
MPC7447) then the processor has the HID1 register and supports DFS2. So
the question is "how to change the core voltage".
> Just two comments:
>
> > Index: dev/dfs.c
> > [...]
> > +
> > +#include <sys/param.h>
> > +#include <sys/filedesc.h>
>
> Why do you need to include <sys/filedesc.h> for?
Its needed by <sys/sysctl.h>, otherwise I get a "struct filedesc" not declared
warning. Should I include an other file instead?
>
> > +#include <sys/sysctl.h>
> > +
> > +#include <machine/cpu.h>
> > +#include <machine/autoconf.h>
> > +#include <macppc/pci/macobio.h>
> > +
> > +#define DFS2 (1 << 22) /* Divide-by-Two */
> > +#define DFS4 (1 << 23) /* Divide-by-Four (MPC7448 Specific) */
> > +
> > +extern int perflevel;
> > +static int voltage;
>
> You should store the voltage inside a softc (pointed out by miod@).
ok.
> > [...]
> > +
> > + printf(": Dynamic Frequency Switching, speeds: ");
> > + printf("%d, %d", ppc_maxfreq, ppc_maxfreq / 2);
>
> We typically use pure lower case for stuff that shows up in dmesg.
> And I'm not sure the "Dynamic Frequency Switching" part really adds
> useful information. Perhaps just change this in:
>
> > + printf(": speeds: %d, %d", ppc_maxfreq, ppc_maxfreq / 2);
New patch coming.
