On 2019-12-29 21:14, Robin Murphy wrote:
> Add OPPs for the GPU, derived from the downstream Beelink A1 DTB.
My RK3328 devices (rock64, roc-cc and other android tv boxes) used to become
unstable when I used similar OPPs as these and vdd_logic got changed to anything
below 1.05v some time ago, network speeds slowed down and devices usually
become unresponsive.
I do use vendor ddr init blobs to run ddr at 786 or 933 MHz, gpu runs at 500 Mhz
and rock64/roc-cc LDO3 is set to use 1.0v instead of 1.1v used in A1 dts,
in case that could be affecting the stability at lower vdd_logic voltages.
These observations was a few months back so I will redo some tests and see if I
still get unstable systems using anything below default 1.1v for vdd_logic.
Best regards,
Jonas
>
> Signed-off-by: Robin Murphy <robin.murphy@xxxxxxx>
> ---
> arch/arm64/boot/dts/rockchip/rk3328.dtsi | 22 ++++++++++++++++++++++
> 1 file changed, 22 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/rockchip/rk3328.dtsi b/arch/arm64/boot/dts/rockchip/rk3328.dtsi
> index 91306ebed4da..e1b1b4551a8b 100644
> --- a/arch/arm64/boot/dts/rockchip/rk3328.dtsi
> +++ b/arch/arm64/boot/dts/rockchip/rk3328.dtsi
> @@ -605,6 +605,28 @@
> clocks = <&cru ACLK_GPU>, <&cru ACLK_GPU>;
> clock-names = "bus", "core";
> resets = <&cru SRST_GPU_A>;
> + operating-points-v2 = <&gpu_opp_table>;
> + };
> +
> + gpu_opp_table: opp_table1 {
> + compatible = "operating-points-v2";
> +
> + opp-200000000 {
> + opp-hz = /bits/ 64 <200000000>;
> + opp-microvolt = <900000>;
> + };
> + opp-300000000 {
> + opp-hz = /bits/ 64 <300000000>;
> + opp-microvolt = <950000>;
> + };
> + opp-400000000 {
> + opp-hz = /bits/ 64 <400000000>;
> + opp-microvolt = <1025000>;
> + };
> + opp-500000000 {
> + opp-hz = /bits/ 64 <500000000>;
> + opp-microvolt = <1125000>;
> + };
> };
>
> h265e_mmu: iommu@ff330200 {
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