linux-kernel - Re: [PATCH v2 12/13] media: qcom: camss: Add support for setting CSIPHY clock name csiphyX

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Message-ID: <5ad949d3-1776-4345-9fdc-99b3dba10bd7@linaro.org>
Date:   Fri, 18 Aug 2023 14:32:06 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Bryan O'Donoghue <bryan.odonoghue@...aro.org>, rfoss@...nel.org,
        todor.too@...il.com, agross@...nel.org, andersson@...nel.org,
        mchehab@...nel.org, hverkuil-cisco@...all.nl,
        laurent.pinchart@...asonboard.com, sakari.ailus@...ux.intel.com,
        andrey.konovalov@...aro.org
Cc:     linux-media@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 12/13] media: qcom: camss: Add support for setting
 CSIPHY clock name csiphyX

On 17.08.2023 16:38, Bryan O'Donoghue wrote:
> Several of our upstream and soon-to-be upstream SoC CAMSS dtsi declare
> csiphyX as opposed to the older clock name csiX_phy.
> 
> For newer SoCs csiphyX turns out to be a clock you really need to set.
> 
> On sc8280xp for example we will encounter difficult to track down and
> root-cause RX CRC errors without setting the csiX_phy clock. On sdm845 and
> sm8250 we declare the csiXphy clock but seem to get away with not setting
> it.
> 
> The right approach here is to set the clock when it is declared. If a SoC
> doesn't require or a SoC driver implementer doesn't think we need, then the
> clock ought to simply be omitted from the clock list.
> 
> Include csiphyX in the set of permissible strings which will subsequently
> lead to the csiphyX clock being set during csiphy_set_clock_rates() phase.
> 
> Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
> ---
So.. is this just a namechange? Is it really necessary?

Konrad