linux-kernel - Re: [PATCH 09/18] clk: qcom: gcc-sm8250: Set delay for Venus CLK resets

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Date: Tue, 9 Jan 2024 10:33:39 +0100
From: Konrad Dybcio <konrad.dybcio@...aro.org>
To: Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
 Bjorn Andersson <andersson@...nel.org>,
 Michael Turquette <mturquette@...libre.com>, Stephen Boyd
 <sboyd@...nel.org>, Philipp Zabel <p.zabel@...gutronix.de>
Cc: Marijn Suijten <marijn.suijten@...ainline.org>,
 linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
 linux-kernel@...r.kernel.org, Dikshita Agarwal <quic_dikshita@...cinc.com>,
 Vikash Garodia <quic_vgarodia@...cinc.com>,
 Manivannan Sadhasivam <mani@...nel.org>
Subject: Re: [PATCH 09/18] clk: qcom: gcc-sm8250: Set delay for Venus CLK
 resets



On 1/9/24 01:34, Bryan O'Donoghue wrote:
> On 08/01/2024 12:32, Konrad Dybcio wrote:
>> Some Venus resets may require more time when toggling. Describe that.
> 
> May or does ?
> 
> I'd prefer a strong declaration of where this value came from and why its being added.
> 
> May is ambiguous.
> 
> "Downstream has a 150 us delay for this. My own testing shows this to be necessary in upstream"

Alright

> 
> Later commits want to add a 1000 us delay. Have all of these delays been tested ?

No, we don't support Venus on many of the newer SoCs..


> 
> If not please describe where the values come.

They come from the downstream Venus driver as you mentioned.
I checked a couple different downstream SoC kernel trees and
tried to assign the values based on what I found in a kernel
for that platform. Some are fairly educated guesses.

Konrad