Hi Jagan,
On Wed, Jun 7, 2023 at 8:43 AM Jagan Teki <jagan@xxxxxxxxxxxxxxxxxxxx> wrote:
>
> On Wed, Jun 7, 2023 at 12:01 PM Dario Binacchi
> <dario.binacchi@xxxxxxxxxxxxxxxxxxxx> wrote:
> >
> > Add support to Rocktech RK043FN48H display on stm32f746-disco board.
> >
> > Signed-off-by: Dario Binacchi <dario.binacchi@xxxxxxxxxxxxxxxxxxxx>
> > ---
> >
> > (no changes since v1)
> >
> > arch/arm/boot/dts/stm32f746-disco.dts | 51 +++++++++++++++++++++++++++
> > 1 file changed, 51 insertions(+)
> >
> > diff --git a/arch/arm/boot/dts/stm32f746-disco.dts b/arch/arm/boot/dts/stm32f746-disco.dts
> > index c11616ed5fc6..cda423b6a874 100644
> > --- a/arch/arm/boot/dts/stm32f746-disco.dts
> > +++ b/arch/arm/boot/dts/stm32f746-disco.dts
> > @@ -60,10 +60,41 @@ memory@c0000000 {
> > reg = <0xC0000000 0x800000>;
> > };
> >
> > + reserved-memory {
> > + #address-cells = <1>;
> > + #size-cells = <1>;
> > + ranges;
> > +
> > + linux,cma {
> > + compatible = "shared-dma-pool";
> > + no-map;
> > + size = <0x80000>;
> > + linux,dma-default;
> > + };
> > + };
>
> This looks unrelated to display enablement, isn't it?
Without the "reserved-memory" node, it is not possible to allocate
memory for the framebuffer.
I got this error:
stm32-display 40016800.display-controller: [drm] *ERROR* failed to
allocate buffer with size 139264
Thanks and regards,
Dario
>
> Jagan.
--
Dario Binacchi
Senior Embedded Linux Developer
dario.binacchi@xxxxxxxxxxxxxxxxxxxx
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