2024-03-10 13:23:18

by Frank Oltmanns

Subject: [PATCH v4 5/5] arm64: dts: allwinner: a64: Run GPU at 432 MHz

The Allwinner A64's GPU has currently three operating points. However,
the BSP runs the GPU fixed at 432 MHz. In addition, at least one of the
devices using that SoC - the pinephone - shows unstabilities (see link)
that can be circumvented by running the GPU at a fixed rate.

Therefore, remove the other two operating points from the GPU OPP table,
so that the GPU runs at a fixed rate of 432 MHz.

Link: https://gitlab.com/postmarketOS/pmaports/-/issues/805
Acked-by: Erico Nunes <[email protected]>
Signed-off-by: Frank Oltmanns <[email protected]>
---
arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi | 8 --------
1 file changed, 8 deletions(-)

diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
index 57ac18738c99..c810380aab6d 100644
--- a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
+++ b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
@@ -107,14 +107,6 @@ de: display-engine {
gpu_opp_table: opp-table-gpu {
compatible = "operating-points-v2";

- opp-120000000 {
- opp-hz = /bits/ 64 <120000000>;
- };
-
- opp-312000000 {
- opp-hz = /bits/ 64 <312000000>;
- };
-
opp-432000000 {
opp-hz = /bits/ 64 <432000000>;
};

--
2.44.0

2024-03-13 19:09:57

by Jernej Škrabec

Subject: Re: [PATCH v4 5/5] arm64: dts: allwinner: a64: Run GPU at 432 MHz

Dne nedelja, 10. marec 2024 ob 14:21:15 CET je Frank Oltmanns napisal(a):
> The Allwinner A64's GPU has currently three operating points. However,
> the BSP runs the GPU fixed at 432 MHz. In addition, at least one of the
> devices using that SoC - the pinephone - shows unstabilities (see link)
> that can be circumvented by running the GPU at a fixed rate.
>
> Therefore, remove the other two operating points from the GPU OPP table,
> so that the GPU runs at a fixed rate of 432 MHz.
>
> Link: https://gitlab.com/postmarketOS/pmaports/-/issues/805
> Acked-by: Erico Nunes <[email protected]>
> Signed-off-by: Frank Oltmanns <[email protected]>

Acked-by: Jernej Skrabec <[email protected]>

Best regards,
Jernej

> ---
> arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi | 8 --------
> 1 file changed, 8 deletions(-)
>
> diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
> index 57ac18738c99..c810380aab6d 100644
> --- a/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
> +++ b/arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi
> @@ -107,14 +107,6 @@ de: display-engine {
> gpu_opp_table: opp-table-gpu {
> compatible = "operating-points-v2";
>
> - opp-120000000 {
> - opp-hz = /bits/ 64 <120000000>;
> - };
> -
> - opp-312000000 {
> - opp-hz = /bits/ 64 <312000000>;
> - };
> -
> opp-432000000 {
> opp-hz = /bits/ 64 <432000000>;
> };
>
>