linux-kernel - Re: [PATCH v6 09/10] arm64: dts: qcom: sc7180: Add support for HDCP in dp-controller

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Date:   Fri, 20 Jan 2023 15:54:57 +0000
From:   Sean Paul <sean@...rly.run>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Mark Yacoub <markyacoub@...omium.org>, quic_khsieh@...cinc.com,
        linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, intel-gfx@...ts.freedesktop.org,
        robdclark@...il.com, quic_abhinavk@...cinc.com,
        dmitry.baryshkov@...aro.org, sean@...rly.run, airlied@...il.com,
        daniel@...ll.ch, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, agross@...nel.org,
        andersson@...nel.org, konrad.dybcio@...ainline.org,
        jani.nikula@...ux.intel.com, joonas.lahtinen@...ux.intel.com,
        rodrigo.vivi@...el.com, tvrtko.ursulin@...ux.intel.com,
        tzimmermann@...e.de, ville.syrjala@...ux.intel.com,
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        christophe.jaillet@...adoo.fr, quic_sbillaka@...cinc.com,
        johan+linaro@...nel.org, dianders@...omium.org, marex@...x.de,
        quic_jesszhan@...cinc.com, bjorn.andersson@...aro.org,
        abhinavk@...eaurora.org, seanpaul@...omium.org
Subject: Re: [PATCH v6 09/10] arm64: dts: qcom: sc7180: Add support for HDCP
 in dp-controller

On Thu, Jan 19, 2023 at 11:35:32AM +0100, Krzysztof Kozlowski wrote:
> On 18/01/2023 20:30, Mark Yacoub wrote:
> > From: Sean Paul <seanpaul@...omium.org>
> > 
> > This patch adds the register ranges required for HDCP key injection and
> 
> Do not use "This commit/patch".
> https://elixir.bootlin.com/linux/v5.17.1/source/Documentation/process/submitting-patches.rst#L95
> 
> This applies to all your patches. Fix it everywhere.

My goodness, this is peak bikeshedding. Surely we have better things to do with
our time?

> 
> > HDCP TrustZone interaction as described in the dt-bindings for the
> > sc7180 dp controller. Now that these are supported, change the
> > compatible string to "dp-hdcp".
> 
> What does it mean? Where do you do it?
> 
> > 
> > Signed-off-by: Sean Paul <seanpaul@...omium.org>
> > Signed-off-by: Mark Yacoub <markyacoub@...omium.org>
> > Link: https://patchwork.freedesktop.org/patch/msgid/20210913175747.47456-15-sean@poorly.run #v1
> > Link: https://patchwork.freedesktop.org/patch/msgid/20210915203834.1439-14-sean@poorly.run #v2
> > Link: https://patchwork.freedesktop.org/patch/msgid/20211001151145.55916-14-sean@poorly.run #v3
> > Link: https://patchwork.freedesktop.org/patch/msgid/20211105030434.2828845-14-sean@poorly.run #v4
> > Link: https://patchwork.freedesktop.org/patch/msgid/20220411204741.1074308-10-sean@poorly.run #v5
> 
> Drop the links.

Why? I've always done this, it seems helpful to me?

> 
> > 
> > Changes in v3:
> > -Split off into a new patch containing just the dts change (Stephen)
> > -Add hdcp compatible string (Stephen)
> > Changes in v4:
> > -Rebase on Bjorn's multi-dp patchset
> > Changes in v5:
> > -Put the tz register offsets in trogdor dtsi (Rob C)
> > Changes in v6:
> > -Rebased: Removed modifications in sc7180.dtsi as it's already upstream
> > 
> > ---
> 
> Changelog after --- .

It's common practice in drm subsystem to include this in the commit message.

Sean


> 
> >  arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi | 8 ++++++++
> >  1 file changed, 8 insertions(+)
> > 
> 
> Best regards,
> Krzysztof
> 

-- 
Sean Paul, Software Engineer, Google / Chromium OS