[RFC PATCH 2/2] video: meson: Use reserving memory function without kernel linear mapping

Michael Nazzareno Trimarchi
2020-02-20T06:07:47Z

Hi

On Thu, Feb 20, 2020 at 4:05 AM Simon Glass <sjg@chromium.org> wrote:
>
> Hi Michael,
>
> On Wed, 19 Feb 2020 at 11:43, Michael Trimarchi
> <michael@amarulasolutions.com> wrote:
> >
> > Memory reserved for the simple framebuffer should not be used
> > and part of memory linear mapping
> >
> > Signed-off-by: Michael Trimarchi <michael@amarulasolutions.com>
> > ---
> > drivers/video/meson/meson_vpu.c | 6 +++---
> > 1 file changed, 3 insertions(+), 3 deletions(-)
>
> Is there a binding file for this? Please add it to a patch.
>

This is an example how to use it. I need to repost it. There is a
compilation issue
later. I need only to have some feedback from Neil because I can not
test this board

> >
> > diff --git a/drivers/video/meson/meson_vpu.c b/drivers/video/meson/meson_vpu.c
> > index 4eb66398d0..134e011b82 100644
> > --- a/drivers/video/meson/meson_vpu.c
> > +++ b/drivers/video/meson/meson_vpu.c
> > @@ -173,9 +173,9 @@ static void meson_vpu_setup_simplefb(void *fdt)
> > * at the end of the RAM and we strip this portion from the kernel
> > * allowed region
> > */
> > - mem_start = gd->bd->bi_dram[0].start;
> > - mem_size = gd->bd->bi_dram[0].size - meson_fb.fb_size;
> > - ret = fdt_fixup_memory_banks(fdt, &mem_start, &mem_size, 1);
> > + mem_start = meson_fb.base;
> > + mem_size = meson_fb.fb_size;
> > + ret = fdt_fixup_reserved_memory(blob, "display_reserved", &mem_start, &mem_size);
>
> Odd that this uses underscore...normally bindings use hyphen.
>

Will fix. There are few things that I need to change here because
sunxi, meson use simpleframe buffer
but they have some code duplication

Micheal

> > if (ret) {
> > eprintf("Cannot setup simplefb: Error reserving memory\n");
> > return;
> > --
> > 2.17.1
> >
>
> Regards,
> Simon