On Mon, Apr 23, 2018 at 02:47:42PM +0100, Rui Miguel Silva wrote:
> To support camera in i.MX7 the cma heap is used to allocate frame buffers. The
> default size of CMA is 16MB which is not enough for higher resolutions (ex:
> 1600x1200).
>
> So, increase the default CMA size to 40MB.
>
> Signed-off-by: Rui Miguel Silva <rui.silva@xxxxxxxxxx>
CMA size can be adjusted by kernel cmdline. I'm not sure it's necessary
to make it fixed in DT.
Shawn
> ---
> arch/arm/boot/dts/imx7s.dtsi | 14 ++++++++++++++
> 1 file changed, 14 insertions(+)
>
> diff --git a/arch/arm/boot/dts/imx7s.dtsi b/arch/arm/boot/dts/imx7s.dtsi
> index 4d42335c0dee..142ea709d296 100644
> --- a/arch/arm/boot/dts/imx7s.dtsi
> +++ b/arch/arm/boot/dts/imx7s.dtsi
> @@ -182,6 +182,20 @@
> <GIC_PPI 10 (GIC_CPU_MASK_SIMPLE(4) | IRQ_TYPE_LEVEL_LOW)>;
> };
>
> + reserved-memory {
> + #address-cells = <1>;
> + #size-cells = <1>;
> + ranges;
> +
> + /* global autoconfigured region for contiguous allocations */
> + linux,cma {
> + compatible = "shared-dma-pool";
> + reusable;
> + size = <0x2800000>;
> + linux,cma-default;
> + };
> + };
> +
> soc {
> #address-cells = <1>;
> #size-cells = <1>;
> --
> 2.17.0
>
