diff mbox series

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

Message ID 20240310-pinephone-pll-fixes-v4-5-46fc80c83637@oltmanns.dev (mailing list archive)
State New, archived
Headers show
Series Pinephone video out fixes (flipping between two frames) | expand

Commit Message

Frank Oltmanns March 10, 2024, 1:21 p.m. UTC 
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 <nunes.erico@gmail.com>
Signed-off-by: Frank Oltmanns <frank@oltmanns.dev>
---
 arch/arm64/boot/dts/allwinner/sun50i-a64.dtsi | 8 --------
 1 file changed, 8 deletions(-)

Comments

Jernej Škrabec March 13, 2024, 6:19 p.m. UTC | #1 
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 <nunes.erico@gmail.com>
> Signed-off-by: Frank Oltmanns <frank@oltmanns.dev>

Acked-by: Jernej Skrabec <jernej.skrabec@gmail.com>

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>;
>  		};
> 
>
diff mbox series

Patch

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>;
 		};