linux-kernel - Re: [PATCH] arm64: defconfig: Enable configs for DisplayPort on J721e

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Date:   Tue, 22 Feb 2022 14:15:40 -0800
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Nishanth Menon <nm@...com>
Cc:     Rahul T R <r-ravikumar@...com>, catalin.marinas@....com,
        will@...nel.org, shawnguo@...nel.org, krzk@...nel.org,
        geert+renesas@...der.be, marcel.ziswiler@...adex.com,
        biju.das.jz@...renesas.com, vkoul@...nel.org,
        enric.balletbo@...labora.com, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, tomi.valkeinen@...asonboard.com,
        laurent.pinchart@...asonboard.com
Subject: Re: [PATCH] arm64: defconfig: Enable configs for DisplayPort on J721e

On Tue 22 Feb 13:26 PST 2022, Nishanth Menon wrote:

> On 12:40-20220222, Bjorn Andersson wrote:
> > On Tue 22 Feb 11:39 PST 2022, Nishanth Menon wrote:
> > 
> > > On 23:37-20220222, Rahul T R wrote:
> > > > Enable DRM and PHY configs required for supporting
> > > > DisplayPort on J721e
> > > > 
> > > > Signed-off-by: Rahul T R <r-ravikumar@...com>
> > > > ---
> > > >  arch/arm64/configs/defconfig | 5 +++++
> > > >  1 file changed, 5 insertions(+)
> > > > 
> > > > diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig
> > > > index 9f23d7ec1232..b0cb894a392e 100644
> > > > --- a/arch/arm64/configs/defconfig
> > > > +++ b/arch/arm64/configs/defconfig
> > > > @@ -702,6 +702,9 @@ CONFIG_DRM_EXYNOS_DSI=y
> > > >  CONFIG_DRM_EXYNOS_HDMI=y
> > > >  CONFIG_DRM_EXYNOS_MIC=y
> > > >  CONFIG_DRM_ROCKCHIP=m
> > > > +CONFIG_DRM_TIDSS=m
> > > > +CONFIG_DRM_DISPLAY_CONNECTOR=m
> > > > +CONFIG_DRM_CDNS_MHDP8546=m
> > > 
> > > Please use savedefconfig to place the changes in the correct location
> > > 
> > 
> > Just to clarify the request, use "make savedefconfig" to generate a
> > defconfig, then based on that put _only_ the relevant changes in the
> > commit.
> 
> Yup, thanks for clarifying.
> > 
> > > Also indicate changes if any in vmlinux in commit message.
> > > 
> > 
> > Nishanth, what are you asking for here? Just a mentioning if this has
> > any impact to vmlinux (or is isolated to the modules selected), or are
> > you asking for anything specific?
> 
> In this case, just ensure to state that vmlinux size has'nt
> changed, in case where we see a =y, we should indicate via
> ./scripts/bloat-o-meter change that is introduced and if yes, we
> should explain why this is fundamental to system boot.
> 
> Why is this necessary? This is to prevent product specific
> configurations (such as early display banner, chime etc) from creeping
> and increasing vmlinux size which has an impact for all ARM SoCs.
> 

Sounds very reasonable, I'll make sure to ask for such motivations in
the defconfig changes that I pick up through the Qualcomm tree as well.

Regards,
Bjorn

> 
> [...]
> 
> -- 
> Regards,
> Nishanth Menon
> Key (0xDDB5849D1736249D) / Fingerprint: F8A2 8693 54EB 8232 17A3  1A34 DDB5 849D 1736 249D