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

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Date:   Mon, 24 Jun 2019 08:39:09 +0900
From:   Chanwoo Choi <cw00.choi@...sung.com>
To:     Krzysztof Kozlowski <krzk@...nel.org>, 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>,
        linux-samsung-soc <linux-samsung-soc@...r.kernel.org>
Subject: Re: [PATCH v3] arm64: defconfig: Enable Panfrost and Lima drivers

On 19. 6. 24. 오전 4:16, Krzysztof Kozlowski wrote:
> 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]

When I tried to find the history of CONFIG_DEVFREQ_GOV_SIMPLE_ONDEMAND 
for defconfig, the following patch[1] added this configuration.
[1] b972ff75f2938c39e2205c23ea0e531d36b27f86
- "arm64: defconfig: Enable UFS on msm8996"

I think that this patch will affect the opration of 'USF on msm8998'.

-- 
Best Regards,
Chanwoo Choi
Samsung Electronics