On Thu, 2019-11-07 at 07:23 +0100, Stefan Wahren wrote:
> Hi Nicolas,
>
> Am 06.11.19 um 10:59 schrieb Nicolas Saenz Julienne:
> > arm64 places the CMA in ZONE_DMA32, which is not good enough for the
> > Raspberry Pi 4 since it contains peripherals that can only address the
> > first GB of memory. Explicitly place the CMA into that area.
> >
> > Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@xxxxxxx>
> >
> > ---
> >
> > Changes since v1:
> > - Move into bcm2711.dtsi
> >
> > arch/arm/boot/dts/bcm2711.dtsi | 20 ++++++++++++++++++++
> > 1 file changed, 20 insertions(+)
> >
> > diff --git a/arch/arm/boot/dts/bcm2711.dtsi b/arch/arm/boot/dts/bcm2711.dtsi
> > index 1f3acd3363ea..6000a01652fa 100644
> > --- a/arch/arm/boot/dts/bcm2711.dtsi
> > +++ b/arch/arm/boot/dts/bcm2711.dtsi
> > @@ -12,6 +12,26 @@
> >
> > interrupt-parent = <&gicv2>;
> >
> > + reserved-memory {
> > + #address-cells = <2>;
> > + #size-cells = <1>;
> > + ranges;
> > +
> > + /*
> > + * arm64 reserves the CMA by default somewhere in ZONE_DMA32,
> > + * that's not good enough for the Raspberry Pi 4 as some
>
> sorry for the nitpicking but i hope the Raspberry Pi 4 B wont be the
> only user of BCM2711.
No worries :)
It's better that way anyway.
>
> So please s/Raspberry Pi 4/BCM2711/
>
> Beside that:
>
> Acked-by: Stefan Wahren <wahrenst@xxxxxxx>
Thanks!
>
> > + * devices can only address the lower 1G of memory (ZONE_DMA).
> > + */
> > + linux,cma {
> > + compatible = "shared-dma-pool";
> > + size = <0x2000000>; /* 32MB */
> > + alloc-ranges = <0x0 0x00000000 0x40000000>;
> > + reusable;
> > + linux,cma-default;
> > + };
> > + };
> > +
> > +
> > soc {
> > /*
> > * Defined ranges:
>
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