linux-kernel - Re: [PATCH RFC 2/2] arm64: dts: qcom: msm8953: Add GPU

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Date: Sat, 27 Jan 2024 18:32:43 +0100
From: Luca Weiss <luca@...tu.xyz>
To: ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
 Bjorn Andersson <andersson@...nel.org>, Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>,
 Vladimir Lypak <vladimir.lypak@...il.com>,
 Konrad Dybcio <konrad.dybcio@...aro.org>
Cc: linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC 2/2] arm64: dts: qcom: msm8953: Add GPU

On Freitag, 26. Jänner 2024 00:50:43 CET Konrad Dybcio wrote:
> On 1/25/24 22:56, Luca Weiss wrote:
> > From: Vladimir Lypak <vladimir.lypak@...il.com>
> > 
> > Add the GPU node for the Adreno 506 found on this family of SoCs. The
> > clock speeds are a bit different per SoC variant, SDM450 maxes out at
> > 600MHz while MSM8953 (= SDM625) goes up to 650MHz and SDM632 goes up to
> > 725MHz.
> > 
> > To achieve this, create a new sdm450.dtsi to hold the 600MHz OPP and
> > use the new dtsi for sdm450-motorola-ali.
> > 
> > Signed-off-by: Vladimir Lypak <vladimir.lypak@...il.com>
> > Co-developed-by: Luca Weiss <luca@...tu.xyz>
> > Signed-off-by: Luca Weiss <luca@...tu.xyz>
> > ---
> > 
> >   arch/arm64/boot/dts/qcom/msm8953.dtsi            | 115
> >   +++++++++++++++++++++++
> >   arch/arm64/boot/dts/qcom/sdm450-motorola-ali.dts |   2 +-
> >   arch/arm64/boot/dts/qcom/sdm450.dtsi             |  14 +++
> >   arch/arm64/boot/dts/qcom/sdm632.dtsi             |   8 ++
> >   4 files changed, 138 insertions(+), 1 deletion(-)
> > 
> > diff --git a/arch/arm64/boot/dts/qcom/msm8953.dtsi
> > b/arch/arm64/boot/dts/qcom/msm8953.dtsi index 91d083871ab0..1fe0c0c4fd15
> > 100644
> > --- a/arch/arm64/boot/dts/qcom/msm8953.dtsi
> > +++ b/arch/arm64/boot/dts/qcom/msm8953.dtsi
> > @@ -1046,6 +1046,94 @@ mdss_dsi1_phy: phy@...6400 {
> > 
> >   			};
> >   		
> >   		};
> > 
> > +		gpu: gpu@...0000 {
> > +			compatible = "qcom,adreno-506.0", "qcom,adreno";
> > +			reg = <0x01c00000 0x40000>;
> > +			reg-names = "kgsl_3d0_reg_memory";
> > +			interrupts = <GIC_SPI 33 IRQ_TYPE_LEVEL_HIGH>;
> > +
> > +			clocks = <&gcc GCC_OXILI_GFX3D_CLK>,
> > +				 <&gcc GCC_OXILI_AHB_CLK>,
> > +				 <&gcc GCC_BIMC_GFX_CLK>,
> > +				 <&gcc GCC_BIMC_GPU_CLK>,
> > +				 <&gcc GCC_OXILI_TIMER_CLK>,
> > +				 <&gcc GCC_OXILI_AON_CLK>;
> > +			clock-names = "core",
> > +				      "iface",
> > +				      "mem_iface",
> > +				      "alt_mem_iface",
> > +				      "rbbmtimer",
> > +				      "alwayson";
> > +			power-domains = <&gcc OXILI_GX_GDSC>;
> > +
> > +			iommus = <&gpu_iommu 0>;
> > +			operating-points-v2 = <&gpu_opp_table>;
> > +
> > +			#cooling-cells = <2>;
> > +
> > +			status = "disabled";
> > +
> > +			zap-shader {
> > +				memory-region = <&zap_shader_region>;
> > +			};
> > +
> > +			gpu_opp_table: opp-table {
> > +				compatible = "operating-points-v2";
> > +
> > +				opp-19200000 {
> > +					opp-hz = /bits/ 64 <19200000>;
> > +					opp-supported-hw = <0xff>;
> > +					required-opps = <&rpmpd_opp_min_svs>;
> > +				};
> 
> If you remove all OPPs but this one, can the GPU still spit out pixels?

Yep, phosh is starting and is rendering at a few fps.

fairphone-fp3:~$ cat /sys/devices/platform/soc@...c00000.gpu/devfreq/1c00000.gpu/min_freq
19200000
fairphone-fp3:~$ cat /sys/devices/platform/soc@...c00000.gpu/devfreq/1c00000.gpu/max_freq 
19200000
fairphone-fp3:~$ cat /sys/devices/platform/soc@...c00000.gpu/devfreq/1c00000.gpu/cur_freq 
19200000

Regards
Luca

> 
> Konrad