linux-kernel - Re: [PATCH v3] arm64: defconfig: Enable Panfrost and Lima drivers

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Date:   Sun, 23 Jun 2019 21:16:40 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     cwchoi00@...il.com
Cc:     Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Olof Johansson <olof@...om.net>,
        Jagan Teki <jagan@...rulasolutions.com>,
        Simon Horman <horms+renesas@...ge.net.au>,
        Leonard Crestez <leonard.crestez@....com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Dinh Nguyen <dinguyen@...nel.org>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Vasily Khoruzhick <anarsoul@...il.com>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        linux-samsung-soc <linux-samsung-soc@...r.kernel.org>
Subject: Re: [PATCH v3] arm64: defconfig: Enable Panfrost and Lima drivers

On Sun, 23 Jun 2019 at 06:31, Chanwoo Choi <cwchoi00@...il.com> wrote:
>
> Hi Krzysztof,
>
> 2019년 6월 23일 (일) 오전 4:20, Krzysztof Kozlowski <krzk@...nel.org>님이 작성:
> >
> > Enable support for Mali GPU with Panfrost and Lima drivers for:
> > 1. Samsung Exynos5433 and Exynos7 (having Mali T760),
> > 2. Allwiner A64 and H5 (Mali 400/450).
> >
> > Signed-off-by: Krzysztof Kozlowski <krzk@...nel.org>
> >
> > ---
> >
> > Changes since v1:
> > 1. Enable Lima driver
> > ---
> >  arch/arm64/configs/defconfig | 3 ++-
> >  1 file changed, 2 insertions(+), 1 deletion(-)
> >
> > diff --git a/arch/arm64/configs/defconfig b/arch/arm64/configs/defconfig
> > index fbbc065415d4..3d31611368af 100644
> > --- a/arch/arm64/configs/defconfig
> > +++ b/arch/arm64/configs/defconfig
> > @@ -518,6 +518,8 @@ CONFIG_DRM_HISI_HIBMC=m
> >  CONFIG_DRM_HISI_KIRIN=m
> >  CONFIG_DRM_MESON=m
> >  CONFIG_DRM_PL111=m
> > +CONFIG_DRM_LIMA=m
> > +CONFIG_DRM_PANFROST=m
> >  CONFIG_FB=y
> >  CONFIG_FB_MODE_HELPERS=y
> >  CONFIG_BACKLIGHT_GENERIC=m
> > @@ -718,7 +720,6 @@ CONFIG_ARCH_TEGRA_194_SOC=y
> >  CONFIG_ARCH_K3_AM6_SOC=y
> >  CONFIG_SOC_TI=y
> >  CONFIG_TI_SCI_PM_DOMAINS=y
> > -CONFIG_DEVFREQ_GOV_SIMPLE_ONDEMAND=y
>
> Exynos5433-tm2 board support the exynos-bus device which
> used the simple_ondmenad governor of devfreq.
> Why do you remove this configuration from the defconfig?

It is selected by default by DRM_PANFROST. The difference is that
PANFROST selects it as module. The 'y' is chosen because of:
  SCSI_UFSHCD [=y] && SCSI_LOWLEVEL [=y] && SCSI [=y] && SCSI_DMA [=y]

Best regards,
Krzysztof