lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <f1438c9d-458b-2ff7-cae9-f7bf4228ef4c@somainline.org>
Date:   Sun, 24 Jan 2021 15:56:06 +0100
From:   Konrad Dybcio <konrad.dybcio@...ainline.org>
To:     Iskren Chernev <iskren.chernev@...il.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>
Cc:     Andy Gross <agross@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        ~postmarketos/upstreaming@...ts.sr.ht,
        Samuel Pascua <pascua.samuel.14@...il.com>,
        Alexey Minnekhanov <alexeymin@...tmarketos.org>,
        Brian Masney <masneyb@...tation.org>
Subject: Re: [PATCH 1/4] ARM: dts: qcom: msm8974: add gpu support

Hi,


> +		gpu_opp_table: opp_table {
> +			status = "disabled";


Is there a good reason to disable this?


> +			opp-800000000 {
> +				opp-hz = /bits/ 64 <800000000>;
> +			};

No. A330 can't go lightspeed (unless there's some secret ultra-binned msm8974pro-v4-ad-5g). [1]


> +
> +			opp-500000000 {
> +				opp-hz = /bits/ 64 <500000000>;
> +			};
> +
> +			opp-275000000 {
> +				opp-hz = /bits/ 64 <275000000>;
> +			};
> +		};

IMHO we should create separate DTs for all revisions of 8974 (sigh) and keep the opp tables in there, only leaving a lowest-common-denominator one here (which according to downstream and the msm/drm driver would be 27000000 /27MHz/) to make it at least probe for everybody..


On a note, max GPU frequencies (based on [1] and grepping for gpu-pwrlevels or qcom,gpu-freq downstream) are:


* 578 MHz for PRO (so -AC)

* 550 MHz is mentioned in [1] but not downstream..

* 450 MHz for everything else (v2.2 has more DVFS steps)


> +			// iommus = <&gpu_iommu 0>;

I *think* you're going to need more gpu contexts (user/priv/spare), but don't quote me on that.


Konrad


[1] https://www.anandtech.com/show/7846/the-difference-between-snapdragon-800-and-801-clearing-up-confusion

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ