linux-kernel - Re: [PATCH v4 2/2] arm64: dts: qcom: sc7280: Add nsessions property for adsp

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Message-ID: <53644b36-2eff-4b1c-9886-591afee8b589@oss.qualcomm.com>
Date: Mon, 11 Aug 2025 13:06:55 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Dmitry Baryshkov <dmitry.baryshkov@....qualcomm.com>,
        Ling Xu <quic_lxu5@...cinc.com>
Cc: cros-qcom-dts-watchers@...omium.org, andersson@...nel.org,
        konradybcio@...nel.org, robh@...nel.org, krzk+dt@...nel.org,
        conor+dt@...nel.org, quic_kuiw@...cinc.com,
        ekansh.gupta@....qualcomm.com, devicetree@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 2/2] arm64: dts: qcom: sc7280: Add nsessions property
 for adsp

On 8/11/25 12:42 PM, Dmitry Baryshkov wrote:
> On Tue, Jul 01, 2025 at 02:19:05PM +0530, Ling Xu wrote:
>> Add nsessions property for adsp context bank to make sessions
>> available for ADSP offload.
> 
> - Describe the problem, describe _how_ the commit solves it.

This is pure software configuration, the only real limitation is that
the total amount of sessions per channel can't exceed 14 (because our
driver says so? I have conflicting information where this number comes
from), but no more than 5 is recommended for optimal performance

I'd rather waste a couple of bytes and pre-alloc the maximum amount on
every channel, so that if someone decides they want to use the DSPs ever
so slightly differently, they don't have to run around changing the DT..

Konrad